Oh, I forgot the exhaust system, in the mix of variables.
Larry
Larry Paulick wrote:
> The selection of the carb, depends on more than just size. The
> variables are rpm range, ci, rear end ratio, AT or stick, 4 or 5 speed
> with OD, tire size, cam, car weight, and the intended purpose. There
> is also the issue of a vacuum secondary or double pumper. Most vac
> secondaries are not adjusted, or never have been and when they are the
> car really comes alive. Is your engine fresh or tired. Do your
> brakes drag, and is the alignment correct.
>
> Finally there is way you drive.
> I have a 5.0L, stock cam, Edelbrock F4B, a 3.54 rear, T-5 trans, with
> .63 5th, same approximate diameter tires, and limit the car to 5100
> rpm, and am using a Holley 600 cfm double pumper. On the road in
> 5th, I get over 20 mpg.
>
> If I stood on the go pedal all the time in lower gears, mileage would
> be terrible.
>
> If you have a vac secondary that is not adjusted for the car, and the
> rest of the car is not tuned, preferably by dyno tuning, then changing
> carbs, won't do anything.
>
> Call Holley or Demon, and tell them what you have and the rest of the
> formula, and they will tell you immediately what carb.
>
> Larry
>
>
> Rigent Gagnon wrote:
>
>> Hi Paul,
>>
>> I have a 600 cfm Holley on my car with the old style Torker intake, a
>> performance cam and Canon headers. Fuel consumption is terrible at
>> anything
>> above 2500 rpm in 4th gear, but the car accelerates like crazy! I am
>> changing the intake and might go to a 500 cfm for a good compromise of
>> drivability, fun and a less guilty conscience about spewing unburnt
>> gas out
>> of the tailpipes.
>>
>>
>
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