Suzuki Quadracer HQ

LT250R Quadracer => LT250R - Engine => Topic started by: Sublunacy on June 05, 2016, 09:48:01 am

Title: Re: looking at a tillotson racing carg maybe
Post by: Sublunacy on June 23, 2016, 07:41:12 pm

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.

Title: Re: looking at a tillotson racing carg maybe
Post by: MotorGeek - Jerry Hall on June 12, 2016, 04:45:34 pm

Quote from: Sublunacy on June 05, 2016, 09:48:01 am

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

Title: Re: looking at a tillotson racing carg maybe
Post by: Sublunacy on June 12, 2016, 09:28:36 am

i wish i could post a pictureof this thing mounted on the quad.  GOING TO LOOK SICK SON! LOL

Title: looking at a tillotson racing carg maybe
Post by: Sublunacy on June 05, 2016, 09:48:01 am

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.