best size 2bbl carb or small 4 bbl for my 318?
Evreyone Has Told Me A 2bbl Would Get Way Better Gas Milage Then A 4bbl
Well "everyone" is wrong.
Consider that the front half of a 4 barrel is in fact a 2 barrel.
Furthermore;
4bbls are rated differently than are 2bbls. So half a 650 4bbl is NOT the same as a 325 2bbl..
IIRC my formulas, you have to divide that 325 by 1.67, to get 195, when rated as a 2bbl. Well........ what size is a 2bbl from a 318?
Ima thinking it was a 250cfm, but I admit I'm guessing. In any case, the only time a 2bbl is better, is if you can't learn to defeat/ or not use, the secondaries.
and I can give you a recipe for a 360-4bbl that once got me fuel-mileage that a 318 can only dream of.
By itself, the 4bbl is not your fuel-economy problem. But just so you know, the Thermoquad has Triple boosters, and size for size, is a hard to beat combination.
I highly recommend a compression test, and mapping out your timing curves and testing your VA