Bike acts up in moist weather - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 07-05-2009, 01:01 PM Thread Starter
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Bike acts up in moist weather

Cleaned the air filters weather dried out so i haven't been able to test Possible carburator adjustment needed?

Bike seems to gain horse power in moist weather, jump even above what seems normal in dry weather.
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post #2 of 4 (permalink) Old 07-05-2009, 04:36 PM
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That sounds normal to me. The water vapor in the air makes it more dense and when it heats and expands in the combustion chamber it actually makes more power. I think some hot rodders and racers have hooked up water injection systems in the past, to take advantage of this principle.

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post #3 of 4 (permalink) Old 07-05-2009, 06:40 PM
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right you are OLHoss,cool dense air makes a heavier charge to compress all things otherwise being equal,the water injection systems were popular when low octane Gas became the norm and there were still some older higher compression engines and the hot rodders used the water injection so they could run more timing and not have detonation or more commonly called valves rattling,The new cold air kits and the intercoolers serve the same purpose to get cool air into the intake so the fuel/air will mix better and more completely burn .More HP for the same amount of fuel




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post #4 of 4 (permalink) Old 07-05-2009, 08:09 PM
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We used to have cool cans when we drag raced(eons ago), packed them with ice and coiled fuel lines ran through them. Same reason cold fuel expanded more when ignited.

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