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Old 11-26-2019, 11:44 PM   #4
Dissident
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Join Date: Jan 2016
Location: Colorado hills
Posts: 123
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Default Re: Fuel pump requirements

From something I wrote a while ago.....
Even lower horsepower racecars can benefit from a detailed investigation of how to build an effective fuel system for a drag racing application. An assumption of “….if the car runs good and it 60 foots hard, then the system is OK…” is far from the truth. Many folks are comfortable with not knowing the facts. Don’t be one of them. Being informed will improve your racing results....
FYI - A Holley carburetor with center hung floats has an operational float bowl volume of 0.066gallons (251.34cc) and a QJet has an operational float bowl volume of 0.022 gallons (81.94cc). The Holley when mounted fore and aft has the primary float opening the n&s under accel while the secondary is trying to close its side off. The QJ is trying to close the flow off.....When under accel g, the system line pressure (before the regulator) must oppose the g.



There is lots to the details of making a system the best for the application instead of just writing checks.


Regards to all that like this kind of stuff,
HB2
Dissident
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