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ChadS
02-27-2005 14:23:03
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Re: Carburator venturi bore size in reply to 42Farmall, 02-27-2005 12:26:50
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From what you explained, if Im reading you right, you have the big carb on it? if so, you have the SH-350 venturi. It is the stock venturi for that engine. i would keep it, and rejet the carb if you have not already,,, if you do insist on installing a larger venturi in it, step up to a venturi from an M, it is about .080 larger than you current venturi and will allow a bit more air in there. it will not really give in much of a power increase, but will flaten the torque in the engine out a bit, will be easier to hook the tires to the track at lower rpms, in a case where you have too much power, and burning the tires off, this may help hook it better. Honestly, a rejet of the carb will yield you the best gain, the stock venturi, will yield the best torque and HP in this engine, Much bigger than the M venturi, and youll drop power from having too big of breath taken. Loses the speed through the intake, which affects torque responce upon acceleration. On the dyno, you want tot look for the best 540 power, and the highest peak hp reading when you lug it below 540, lets say 400-375 pto rpm,,, if you have the carb right, you should be able to get about 5-9 more hp past the 540 rpm when you lug it down. It should stay steady on the dyno upon the lug. But, sometimes,,, too much power is too much for the ground speed. Hope this helps,, ChadS
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