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08-25-2008, 01:59 PM
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#1 (permalink) |
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Homemade Manometer
Pros and cons?
http://obairlann.net/reaper/motorcycle/manometer.html _______________________________________________ vfr mailing list vfr@xxxxxx For subscription and delivery options: https://lists.cs.wisc.edu/mailman/listinfo/vfr |
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08-25-2008, 07:53 PM
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#2 (permalink) |
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RE: Homemade Manometer
> -----Original Message-----
> From: Mac Christopher > > Pros and cons? > > http://obairlann.net/reaper/motorcycle/manometer.html Pro: it's cheap and easy and perfectly accurate if you can read it Con: the water levels will bounce all over the place, especially with larger cylinder displacement motorcycles, making it hard for you to read it. Probably a moderate problem with the VFR. I have a friend who did this to balance the carbs on his BMW GS1000 PD. He (a very accomplished mechanical engineer with an automotive background) was pretty frustrated by the results. I stopped over when he was doing it, and he had a very difficult time reading the levels. Part of it was the lumpiness of the twin, plus the size of the pistons, I think. That's why commercial units have restrictors/dampers to moderate the air pulses. (He should have just taken me up on my offer to borrow my Morgan Carbtune). Possible solution: restrict the tube diameter with VERY small diameter tubing upstream from the water. Might also be able to get fixed tubing orifice of a proper size from McMaster/Carr or another industrial supply house. MJB --------------------- '94 VFR750 '89 NT 650 (hers) _______________________________________________ vfr mailing list vfr@xxxxxx For subscription and delivery options: https://lists.cs.wisc.edu/mailman/listinfo/vfr |
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08-25-2008, 08:37 PM
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#3 (permalink) |
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Re: Homemade Manometer
The pro is that it's cheap, anyone can make one, and it increases the
resolution by 13.5x (20mm Hg = 270mm H2O). But there is one con in particular you should be aware of: If one end of the tubing slips off its connection, you're going to suck the water right out the other end tube and into your throttle body. That's not a good thing. So add an air chamber to each end of the tubing with enough volume inside to catch all the water (something like a baby food jar with a couple barbed fittings through the lid). It'll catch any water that makes it out the end of the U-tube, and the added air volume will also help to even out the pressure pulses so it's easier to read. I've been using a home-brewed 4-channel version (made from tygon tubing & PVC pipe) for several years. Works like a champ. -John Murin 98vfr800 > Pros and cons? > > http://obairlann.net/reaper/motorcycle/manometer.html _______________________________________________ vfr mailing list vfr@xxxxxx For subscription and delivery options: https://lists.cs.wisc.edu/mailman/listinfo/vfr |
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