1 Balancing throttle bodies Wed Jul 20, 2011 1:52 am
pjjms
Silver member
I would like to build a simple water tube rig for balancing. Anybody know how many inchs of water gauge the engine will pull at idle?
Peter
Peter
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This is a variation on the above long tube manometers ... without the risk of drawing fluid into the throttle bodies.ungaas wrote:it's been done before, try these 2 sites for a bit of info ....
1986 k75, 1985 K100rt, |
RT wrote:My wife wants to know where to get one of these manometers, she's been making do with a wimpometer for years
RT
pjjms wrote:Assuming the large container had an open top then the water or oil would just be sucked into the motor until it ran out. If the container had a closed lid water or oil would be sucked into the motor until the air space in the jar reached a vacuum equal to that in the inlets. I think the system need to be closed. With the tubes being linked together near enough the same vacuum is acting on all surfaces of the water or oil so it stays put bar a slight movement. The way the 2 jar manometer is piped up (the 2 jars linked) it should just act like a couple of large diameter tubes, as vacuum is acting on both jars, and the liquid in each is linked to the other.
1986 k75, 1985 K100rt, |
charlie99 wrote:nice work bert ....those guages are an excelent tool
i wonder what it feels like whilst cruising around now ?
how does the idle sound ?
1986 k75, 1985 K100rt, |
I just checked the weather report and it seems that here along the coast we will stay cooler.charlie99 wrote:wow bert thats some awesome temperature variation ......some times - something and then +120 .....omg ..
1986 k75, 1985 K100rt, |
pjjms wrote:Well that didn't go well. Made up a set of balance tubes as per the links above. About 1m long and 50% filled with water. Warmed the bike up, stopped the engine and connected them. The instant I started the engine one cylinder sucked the tubes dry.
So I disconnected them again. Attempted to set the idle but could not get it below 1100rpm. Set the brass screws to one turn out, (they were at 3 truns) and then was able to adjust the idle correctly. Connented the water tubes again with the same result.
Ran out of time to go further. I will see if I can get a gauge this week to test if the setup is just wildly out of adjustment. Maybe the water tubes are too sensitive for the current settings.
Idles like a tractor but gets much better above 2000rpm.
Two Wheels Better wrote:Typical Haynes instruction on motorbike repair: "Park motorcycle on centre stand. Fix engine. Test ride."
Yes, Rene. I've been researching this since I saw your post above and was able to find more information, again posted by you to bmwk.nl. Seems the prof.sync tool is an unfinshed project from a couple of contributers to Flyingbrick.de. It has stalled in development because of infighting. The concept looks great; I love that you can use the computer to data acquire and store it for analysis. But getting your hands on such a device as Prof.sync looks to be expensive. ReneZ said in that posting that you could buy a few Carbtunes for the price. I suspect there is a solid state vacuum sensor assembly that needs to be build and interfaces to the PC. I wonder if the hardware could be reverse engineered to make it more widely available to members of this forum.ungaas wrote:ReneZ - I bet your bike runs silky smooth, is there more information on the program, ie is it purchasable.
Last edited by robmack on Mon Jul 25, 2011 4:45 pm; edited 1 time in total
Two Wheels Better wrote:I've just scored a nice set of K1/K1100 throttle bodies from overseas on eBay. I'm looking forward to being able to set 'em up on my K100 using suggestions in this thread in a coupla weeks time when they arrive. It'll be interesting to 'feel' if there's any noticeable difference in power, if perhaps she'll gain a increase in 'revability', and what the drop in fuel mileage will be compared to the narrower TBs of the K100, which regularly gives me under 5 litres per 100 kilometres travelled (20+ kms per litre).
Inge K. wrote:About changing TB`s, in another forum a guy aiming a bit higher and put K12 TB`s on a K75.
Inge K.
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