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1Back to top Go down   K75RT Fuel Cooler Empty K75RT Fuel Cooler Thu Mar 19, 2015 10:30 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Starting a new thread to document the installation of a fuel cooler on my '94 K75RT.

Picked up this cooler on eBay.  Looks pretty nice and has as many fins internally as you see on the outside.  Has a pretty good volume that should give me about 40 seconds of residence time.  Extruded aluminum body looks pretty snazzy and doesn't require any protection from stones and other debris.

K75RT Fuel Cooler K75_co12

Got it here:  https://www.ebay.com/itm/10-Silver-Anodized-Dual-Pass-Transmission-Oil-Cooler-With-Fittings/302141681195?hash=item46590c2e2b:g:78YAAOSwUchaBCAf:rk:1🇵🇫0

5/16" hose barbs:  http://www.ebay.com/itm/331396623114?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

I am mounting the cooler horizontally below the radiator and in front of the cam chain cover.  Hose connections will be on the left hand side.  The mounting bracket will be bolted to the lower radiator bracket.  I removed the existing flat head screws and the body nuts they screwed into.  Replaced them with 25mm long 6mm bolts with fender washers, lock washers and nuts.  The bracket goes in under the mounting tabs for the fan.  Bolts go from the inside with the nuts outside.

K75RT Fuel Cooler K75_co13

Bracket is approximately 3mm thick stainless steel.  Drawing with dimensions I used to follow.



Last edited by Point-Seven-five on Wed Jan 16, 2019 2:21 pm; edited 1 time in total


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

2Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Thu Mar 19, 2015 11:29 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Cooler Mounting Bracket.  Note:  I am not a draftsman...

K75RT Fuel Cooler Fuel_c10


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Thu Mar 19, 2015 11:59 pm

BadjerJim

BadjerJim
Silver member
Silver member
Awesome!  Thanks!

    

4Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 20, 2015 12:39 am

Rick G

Rick G
admin
admin
This is the cooler on Charlie99s bike. Mine on the K1100 is the same and attached directly to the grill of the fairing
K75RT Fuel Cooler Fuel_c10
it works so well that on a cold morning I don't get the nice warm tank to keep the knees warm.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

5Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 20, 2015 3:31 am

charlie99

charlie99
VIP
VIP
can I add something to the thread ?

if you decide to place it low across the timing cover consider this ....rocks, chips of stone, sand  etc  bombard the timing cover from the front wheel flyup on a standard setup

if you extend the front fender (on the rear ) by about 75-100 mm... you might find that the spray pattern of chips and debris doesn't get as high on the front covers ...maybe only as high as the oil pump

has made a huge difference for me ......just a thought    ( I could have some before and afters pics if your interested )

ps .

..don't forget to protect the feed and outlet lines from debris exposure ...the refrigerant insulation tubing does a fairly good job at this ...it will not protect during a crash event at all ...be aware !!


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

6Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 20, 2015 9:07 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Good observations, Charlie.  I have just taken delivery of an Extenda Fenda to do exactly what you suggested.  As far as fuel line exposure, With any luck they will be mostly behind the radiator fairing.

I have positioned the cooler as far over to the right of the bike as possible limited only by the cooling hose that is on that side in front of the crankcase cover.  I don't think stones will be much of an issue on the fuel lines as witnessed by the aforementioned coolant hose. 

I am also planning on shortening the hose barbs and have chased the 1/4" NPT threads in the cooler to get the ends of the barbs in toward the centerline of the bike as much as possible.  I've gotten about 3/4 to 1". 

Will be heading out to the garage in a little while when things warm up a bit more.  Need to run into town this morning to get another drill bit as the darn stainless I am using is a welding grade and merciless to cutting tools.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

7Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 20, 2015 9:19 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Rick, I looked at your installation originally, but couldn't figure out a way to mount the cooler without getting rid of the radiator fairing.  Thought about going below the radiator fairing, but couldn't think of a way to neatly protect the fins with the limited fabrication capabilities at hand. 

As you can see, the cooler I have settled on is a fairly robust if somewhat bulky unit that I expect will keep things close to ambient on the hottest days at the slowest speeds.  The only thing I give away to Charlie's design is that I do not have the benefit of the fan drawing air over my cooler when at a standstill in traffic.  Still, I think the open design of the cooler, and it's being unenclosed will allow a fair bit of convection air flow round it.  That with the extended residence time should keep the exit temperature reasonable even at a standstill.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

8Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 20, 2015 3:31 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Cooler is mounted.  Revised bracket above will get about 1/4" more clearance to the bottom of the radiator fairing. 

Need to cut down the hose barbs and get a chunk of fuel line to finish things up.  At least I know the cooler fits and doesn't stick out too much.

K75RT Fuel Cooler K75_co14

K75RT Fuel Cooler K75_co15

One ride this year and already the bike is filthy!  Still too cold to wash her.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

9Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 20, 2015 3:48 pm

Kyle10

Kyle10
Life time member
Life time member
K75RT Fuel Cooler 112350 Now that looks good.


__________________________________________________
1985 K100rt 0052183
1983 Honda VF750 007713 
    

10Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 20, 2015 4:52 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Plumbed.

K75RT Fuel Cooler K75_co16

K75RT Fuel Cooler K75_co17

Going to put a little insulation on the exposed hose.  Need to touch up the Left side lower before I put it back on. 

I think it looks pretty good.  Radiator grille hides it pretty well.  Hoses look to be out of the way.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

11Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 20, 2015 6:21 pm

robmack

robmack
Life time member
Life time member
I like the looks of that cooler. It's prettier than run of the mill coolers with plate metal fins.

Couple of questions.

How will you be comparing the before-install and after-install temperatures of the fuel?

Would it be an idea to include a bypass valve in case the hoses or cooler springs a leak?


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

12Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 20, 2015 6:42 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Thanks Rob, before/after comparison will be this summer, probably as soon as early May when I can run a full tank of gas down to about a third of a tank and not have my thighs barbequed. 

Don't know about a bypass valve; sounds like extra plumbing, fittings and chances for leaks.  There is not that much additional hose in the circuit.  I only added one hose about 15" long running from the cooler back up to the tank.  The cooler itself is probably the most bulletproof part of the fuel system.  The body is an aluminum extrusion, and the 3/8" thick end caps are nicely welded on.  I may add quick disconnects in the lines, just to make removing the cooler or tank easier.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

13Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 20, 2015 8:56 pm

BadjerJim

BadjerJim
Silver member
Silver member
Great work. Thanks for the pics and the details.

    

14Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Mar 21, 2015 12:30 pm

k-rider

k-rider
Life time member
Life time member
That looks really COOL 😎 

Good work .
If you should be so unlucky to have a leak at the cooler ,,just carry a short piece of 8mm. Pipe
Use it to connect the hoses instead of the cooler .

K-rider


15Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Mar 21, 2015 1:29 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Thanks for the kind comments. 

I don't think that this cooler is going to leak.  It is a fairly heavy wall extrusion.  Much stronger than the conventional coolers that are built like radiators.  Being afraid of a fuel leak was the main reason for selecting this particular cooler, I wouldn't want to risk the other type of cooler.   Not only are the cooler walls heavy, but the welded end caps are about 10mm thick.  If there are going to be any leaks, they would be in the hoses, and they would be there even if the cooler wasn't.

The hoses connecting the cooler are really tucked away well behind the radiator and the left side lower fairings.  The only exposure is about 4-5cm right at the cooler connections.  There is actually less exposure than the standard fuel lines on a naked bike.  I could get better photos of the installation, but the bike is wedged into a small corner of my garage right now in a position that makes getting a good picture impossible.

Bottom line, except for adding about 35cm of hose and two clamps, there isn't anything that would make the fuel system less reliable.  And remember, this is in the return line where the pressure is only high enough to push the fuel back up to the tank at a head of about 50cm at the very most.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

16Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Mar 21, 2015 3:51 pm

BadjerJim

BadjerJim
Silver member
Silver member
And what's really beautiful about this mod is... That if it doesn't work out for any reason you can put the bike back to stock in a few minutes. 

I agree with the above comments, I was afraid of pushing GASOLINE through a thin-walled conventional radiator, for fear that the smallest rock chip would make a leak. I've got this cooler in hand right now and it is very beefy, made of strong extruded aluminum. I would have expected it to cost $100 at least. 

At $25 it's a real bargain. Can't wait to get it hooked up.

    

17Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Mar 21, 2015 5:00 pm

Crazy Frog

Crazy Frog
admin
admin
Thanks for all the info Point-seven-five.

I am still waiting for mine to arrive.

I don't have any idea when I will be able to test it, but here in Eastern Canada, we are working really hard to get rid off the winter and start our biking season. K75RT Fuel Cooler 44271

K75RT Fuel Cooler Cax4v510

I know it's been a rough winter because my snowblower has more kms on it than my motorcycles.


__________________________________________________
K75RT Fuel Cooler Frog15K75RT Fuel Cooler Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

18Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 27, 2015 6:57 am

Crazy Frog

Crazy Frog
admin
admin
me thinking.....

As I have multiple options to install the unit, I am wondering what would be the best position.
Should it be mounted facing the road(#1) or parallel to the frame of the bike(#2)?
What do you think is the most efficient?

K75RT Fuel Cooler K75_co10


__________________________________________________
K75RT Fuel Cooler Frog15K75RT Fuel Cooler Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

19Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 27, 2015 7:24 am

92KK 84WW Olaf

avatar
Life time member
Life time member
I took out my thermal lining last weekend.

I must try some bbq snowman too. Last one I tried was a peaty taste and kind of interfered with my head. Must have been the Scottish snow.

Fuel cooler looks excellent and have seen those type. They are quite robust and should do well. The extended front fender is essential as the efficiency of the cooler is reduced if its caked up.

I have noticed when the gas tank is full the fuel stays cool but when the level gets low it gets very warm.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

20Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 27, 2015 7:27 am

indian036

indian036
Life time member
Life time member
If I had the flexibility in positioning, I'd be using position 2. When mine arrives, I'll be using version 1 as Point-seven-five has done, but I don't think the difference either way will be massive. 

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy ROB the Red Old Bike   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Tom the Triple (now on Historic rego too.)
    

21Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 27, 2015 7:50 am

K75cster

K75cster
Life time member
Life time member
I'd believe option 1 with airflow over the greater area as it appears the unit is infact a u shaped tube with entry and exit at the same end this gives the air greater impact on the unit especially if the u is upper and lower meaning air cools the whole length at point of impact then the heat escapes taking the heat with it the back side without direct air is still large enough to assist with cooling


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

22Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Fri Mar 27, 2015 11:03 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Option #2 is the most efficient, but difficult to implement on my RT.  Bert's bike with the chair should be able to go this route without much trouble.

Option #1 does have the benefit of more turbulence around the fins although the back side won't see as much airflow.  Because it is a two pass cooler with the passages horizontal in my installation, it is best to have the entering fuel at the backside where the airflow is less and the cooler body is not as cool as the front.  This is to maximize the temperature difference between the fuel and the cooler body and thus the heat transfer.

One of the features of this cooler that I liked was that it has an internal volume greater than 1/2 liter which should give the fuel something like 40 seconds of residence time in the cooler as it passes through.  That will allow lots of time for heat transfer as opposed to the radiator type coolers that hold a lot less.  

My cooler is installed, and as soon as the weather breaks I hope to get out for a trial run.  Later in April I am hoping to make a trip to Colorado, about 3500 miles round trip.  I will be reporting on how it works after the trip. 

Olaf, low tanks are probably getting warm because there is less fuel to absorb the heat.  With 1/2 the mass, the same heat input will raise the temperature twice as much.  A low fuel level also has less contact with the walls of the tank and the walls it is contacting are at the bottom where the insulation is installed.  The fairings don't help with cooling the tank either.

This cooler really looks good on the bike, what you can see of it since being below the radiator shroud it is invisible when you are within 5-6 feet of the bike, and even at a distance it blends into the front of the engine.  You have to be looking for it to even notice it.  My engine is all black with the silver cooler.  Would have been nice to have the cooler in a black anodize.  Maybe next winter...


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

23Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Wed Apr 22, 2015 5:27 pm

Crazy Frog

Crazy Frog
admin
admin
As I am a cheap guy, I always look for bargains.
Here is a very efficient type of cooler not costing an arm and a leg Very Happy.
In fact it could act as a gas tank.

K75RT Fuel Cooler Image210


__________________________________________________
K75RT Fuel Cooler Frog15K75RT Fuel Cooler Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

24Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Wed Apr 22, 2015 10:54 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Holy Crap!  Where do you find those pictures?

Update:  Just finished the second day of a three day run to Colorado.  540 miles yesterday, and 660 today.  Ambient temperatures in the 50-60 F range.  No perceptible rise in tank temperature above ambient both days.  No operating issues or leaks to report with the cooler.

Looks like a winner.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

25Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Nov 19, 2016 2:42 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Just coming back to report on two seasons and nearly 20,000 miles on the cooler including a week of riding in New Mexico, Utah and Arizona in temperatures up to 118F/45C.

The cooler has been totally trouble free, in fact, I have just about forgotten it's even there.  The best part is that "hot tank syndrome" has been eliminated, even in last summer's desert heat.  I still get some heat coming up from under the fairing, but it isn't as bad as what I was getting from the hot fuel in the tank.  

The bike is way more pleasant to ride now.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

26Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Nov 19, 2016 9:19 pm

charlie99

charlie99
VIP
VIP
good to hear someone else has done the mod and experienced the effect

ride well


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

27Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Nov 19, 2016 9:37 pm

indian036

indian036
Life time member
Life time member
I finished up deciding to use a standard transmission oil cooler type, mounted to the front of the radiator screen. Cheated by using cable ties, but it hasn't moved.

Its been very successful, going from not being able to grip the tank with my knees on anything other than a cool day, to no problem even on the hottest days.

K75RT Fuel Cooler Fuel_c10

My recent run to Guyra and smithy's place on BOB the Blue Old Bike showed a slight tendency to be warm, even though the weather on the whole was pretty pleasant. Nothing like the red bike, but to be sure, I've sourced a fairly similar cooler to be installed on it, one of these days.

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy ROB the Red Old Bike   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Tom the Triple (now on Historic rego too.)
    

28Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sun Nov 20, 2016 7:37 am

Dai

Dai
Life time member
Life time member
Oh well, at least they're black cable ties.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

29Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sun Nov 20, 2016 7:53 am

indian036

indian036
Life time member
Life time member
Dai wrote:Oh well, at least they're black cable ties.
I couldn't have borne the shame of white ones!   Wink

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy ROB the Red Old Bike   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Tom the Triple (now on Historic rego too.)
    

30Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sun Nov 20, 2016 4:54 pm

K75cster

K75cster
Life time member
Life time member
What is that cooler off Bill?


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

31Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sun Nov 20, 2016 5:06 pm

92KK 84WW Olaf

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For 9 months of the year here the warm fuel is quite welcome, especially just now while we are zero temperatures.

But in France last year when we had 35c hot fuel was bad. So this idea is very welcome and seems quite easy to fit too.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

32Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sun Nov 20, 2016 6:18 pm

indian036

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K75cster wrote:What is that cooler off Bill?
It's a generic found by doing a search for "transmission oil cooler" on eBay. No idea what it is designed to fit, but I just checked published dimensions for the space where I fitted it. 

The one I have for BOB the Blue Old Bike is slightly different in dimensions, and is even pre-painted blue, though lighter than the bike's blue.

I did have to do some searching for the fittings for the fuel hose to cooler interfaces. 

Bill

PS. Make sure it's installed on the return line so it's not under fuel pump pressure.


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy ROB the Red Old Bike   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Tom the Triple (now on Historic rego too.)
    

33Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Dec 02, 2017 3:54 pm

MartinW

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I chased around for a while for a commercial fuel cooler the would fit on my K75s. I could not find anything of the right size that would not look out of place. So I ended up making my own. Took a bit of stuffing around but it's nearly finished and I'm happy with the look of it. It going to be located over the fuel rail under the tank. I am still chasing 1/4" Allen plugs locally I will try a couple more places on Monday, but if I'm unsuccessful I'll order of Aliexpress. I still haven't decided whether to paint and polish just the fins. And while I believe that sandcast aluminium disperses heat better than machined aluminium I've been unable to find anything that supports my theory.
Regards Martin.
K75RT Fuel Cooler Fuel_c10
K75RT Fuel Cooler Fuel_c11

    

34Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Dec 02, 2017 5:56 pm

Andrew2

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You guys are so enlightening. I didn't realize it was the heat from the fuel tank. I just thought it was coming off the motor. Looks like another little project coming up K75RT Fuel Cooler 652573.

 Cheers
 Andrew


__________________________________________________
1987 K100RS
    

35Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Dec 02, 2017 7:55 pm

Rick G

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Martin
Motospecs at 280 Cullen Ave East http://www.motospecs.com.au/ Have small oil coolers about 100mm x 150mm and 20mm thick which are ideal. I have one and also Charlie. They are just right.
I bought all the parts to reco the ZF auto in my car, they were great to deal with and while there I spotted a large cooler that was the same construction as the fuel cooler and asked about them and he showed me one that was identical.



Last edited by RicK G on Sat Dec 02, 2017 8:46 pm; edited 2 times in total


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

36Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Dec 02, 2017 8:20 pm

MartinW

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Thanks Rick but a bit late I'm almost finished. Just have to get the Allen plugs maybe give it a sandblast on the sides where I had to remove some of the residual slag. Then decide whether to paint and polish, then mount it.
I chased 8" coolers all over the net but could not find anything I considered suitable. With the one I have built, if it doesn't run cool enough I also have the option of adding fins to the rear. I have now gained access to a turret mill. I can't seem to access the link you have posted.
Regards Martin.

    

37Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Dec 02, 2017 9:01 pm

charlie99

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was looking on ebay the other say and found the drivetech cooler also

bit different price to what we paid though

https://www.ebay.com.au/itm/Drivetech-Transmission-Cooler-Kit-Universal-100x152/152692700579?epid=2237119410&hash=item238d31b5a3:g:rDsAAOSwAQBZr03g

cheers


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

38Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Dec 02, 2017 9:29 pm

MartinW

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Thanks fellas I just had a look at it, unfortunately not really applicable to what I wanted. Due to the fact that I have a K75s the only place with enough room was in front of the radiator fairing or in front of the belly pan. I will be mounting mine above the fuel rail so that the fins are in the right orientation. I will post a picture when I get it mounted.
Regards Martin.

    

39Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Dec 02, 2017 9:40 pm

charlie99

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with the standard 2 core radiator there looks to be room to mount it backwards , and still fit behind the radiator grill   ..may try this approach soon


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

40Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sat Dec 02, 2017 9:50 pm

MartinW

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I think I measured 10-13mm behind both the radiator fairing and the belly pan. Not enough room to get it behind with anything I could find. Hence the building it from scratch, it caused a few headaches but I got there in the end.  K75RT Fuel Cooler 610153 And I am pretty happy with the result although time will tell if it is effective.
Regards Martin.

    

41Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sun Dec 03, 2017 10:51 am

Point-Seven-five

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Martin, nice job so far.  If there is ever a MkII version, may I suggest that you go to thinner fins closer together.   A fin to spacing ratio of 1:2 should work.  The idea is to get maximum surface area. 

Also, try to get the passages as close to the fins as possible to minimize the distance the heat has to travel.

The other two variables to heat transfer are turbulance, which results from smaller passage cross section and residence time which is a function of internal volume.  Larger volume, more residence time, more cooling.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

42Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sun Dec 03, 2017 4:44 pm

MartinW

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Thanks Gryph the fins are a bit thick.  The Mk1 version pattern had more fins and thinner but due to the requirements of casting I had to go thicker and fewer. Even with the thicker and fewer fins it took three goes to get the pattern to hold together. I was going to thin down the back after casting, but I have left it thick with the view to adding more milled fins. I maximized the volume as much as I dared. Due to the fact the galleries were drilled with drill bits with a total length of 300mm I had to be extremely careful not have the bits wander into the neighboring gallery. Now with access to more equipment the Mk 2 version if needed will probably be milled then sandblasted.  The pattern used for the casting is the Mk 6 version, I had a few problems but I learnt during the process. Hoping to get it finished today if I can source the Allen plugs. I still unsure about painting it, and if I do I wont paint the back. Due to the fact that the casting had to be sanded to remove dags I was only able to take measurements of the shrinkage at the base, front and rear. The pattern base width was 70.04 mm front and rear, the casting measured 69.57mm front and 69.84mm rear.
Regards Martin.

    

43Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Sun Dec 03, 2017 5:52 pm

indian036

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MartinW wrote:And while I believe that sandcast aluminium disperses heat better than machined aluminium I've been unable to find anything that supports my theory.

My attempt at support for the theory is that sandcast has a greater surface area than machined, and heat transfer is increased by greater surface area. This is exactly the reason that air cooled engines have fins rather than just cylinders, and radiators of all types have fins as well as tubes.

Yours is certainly prettier than mine for all its extra work to produce. I expect it will be effective, and am looking forward to your report of its success.

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy ROB the Red Old Bike   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Tom the Triple (now on Historic rego too.)
    

44Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Mon Dec 04, 2017 1:09 am

MartinW

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Spent 2.5 hours chasing bits, the third place I tried had six only of the Allen plugs. K75RT Fuel Cooler 723598   The rest of the time I zig zagged back in the direction of home chasing Teflon paste I eventually got it at the local Super Cheap the closest car place to home. I had tried six places before I struck gold. I proceeded to fit it out and I am reasonably happy with it. But when I went to make the brackets and found I had no aluminium flat bar. I had had enough of chasing around in the morning and also had to take the Honorable Minister to the Doctors ( Nothing serious). So I will have to chase some flat bar tomorrow. However I had some double side tape so I stuck it on roughly in the position it will occupy give or take an inch. It does sort of stand out a bit more than I anticipated so a paint job including the end of the fins might be called for.
Regards Martin.
K75RT Fuel Cooler Fuel_c12
K75RT Fuel Cooler Fuel_c13

    

45Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Mon Dec 04, 2017 2:56 am

charlie99

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just  another silly question mate ,
why the pressure gauge ?  isn't the outlet of the pressure regulator a very low value ?

I guess if you see high reading there could be something seriously wrong ...but I guess for the sake of "bling "   that looks cool


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

46Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Mon Dec 04, 2017 3:11 am

MartinW

MartinW
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Charlie I have a real good reason for the gauge, I had one floating around and I needed to fill a hole. K75RT Fuel Cooler 44271 And I'm one Allen plug short. I might not stick with the gauge but once it is hooked up I'm interested to see the reading. I've taken readings at the rail but never on the return. And maybe it will show something if the FPR is out of wack.
Regards Martin.

    

47Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Mon Dec 04, 2017 6:40 am

Laitch

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MartinW wrote:Charlie I have a real good reason for the gauge, I had one floating around and I needed to fill a hole. K75RT Fuel Cooler 44271
A clinometer in there would give observers something to think about. Smile


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1995 K75 90,000 miles
    

48Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Mon Dec 04, 2017 2:12 pm

MartinW

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Laitch great suggestion as always, I have another hole plugged on the upper side. Any suggestions?? K75RT Fuel Cooler 610153
Regards Martin.

    

49Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Mon Dec 04, 2017 8:28 pm

blaKey

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A boost gauge... K75RT Fuel Cooler 161205


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Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

50Back to top Go down   K75RT Fuel Cooler Empty Re: K75RT Fuel Cooler Mon Dec 04, 2017 9:45 pm

MartinW

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There you go problem solved, not that there really was a problem. I picked the last 1/4" Bspt  Allen plug in the area. Picked up some stainless plate for the brackets,I now need to order a clinometer, and a boost gauge. Feeling a bit slack today so I might just paint it and do the brackets on Friday. K75RT Fuel Cooler 87464
Regards Martin.

    

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