so i am sort of feeling out a new carb for 1992 lt250r.
im looking at the new tillotson hw-24a. the venturi size is 32mm and the main bore is 36mm.
i think it is about right for the rpms we are pulling. maybe a little smallish but close enough. remember this is so it will generate a few hundred more rpms than a slide carb at the same size.
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i get huge swings in temperature here seasonal and daily.
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i just need confirmation it will generate enough rpm for a shearer pipe setup.
i wish i could post a pictureof this thing mounted on the quad. GOING TO LOOK SICK SON! LOL
so i am sort of feeling out a new carb for 1992 lt250r.
im looking at the new tillotson hw-24a. the venturi size is 32mm and the main bore is 36mm.
i think it is about right for the rpms we are pulling. maybe a little smallish but close enough. remember this is so it will generate a few hundred more rpms than a slide carb at the same size.
--------
i get huge swings in temperature here seasonal and daily.
-------
i just need confirmation it will generate enough rpm for a shearer pipe setup.
Carburetors that have a "bomb" site (fuel discharge ring) in the venturi and a butterfly shaft have really good fuel atomization but the air flow is really hindered as compared to a conventional slide type carb. We have used a lot of these carbs out of necessity on the racing go karts and jet skis engines we build.
I has been a lot of years since I have done any flow testing on a pumper carb that small. I think that you will find that it will need a pumper carb around 38 to 40mm to have equal the air flow of a 34mm slide type carb.
An engine needs a certain amount of air flow to make a desired amount of power.
Air flow = power.
Fuel atomization = fuel milage, and tunability/rideability
on my psi pipe the mikuni 34mm got it beyond peak power into overrev.
pardon my inquisition but if i switched to a diaphram carb i would not want it to overrev more than 500 rpm or it will be lean somewhere? either at peak power or at maximum over rev.