I understand Q-jets

[Paul Tholey]

>> 	There is a school of thought that the racers used to replace the
>> Rochester QuadraJets with Holleys because they couldn't understand the
>> QuadraJets! 

        To be more correct the reason the Holley carb is used over a Q-jet
is because the Q-jet has a single fuel bowl in the center to feed both the
primaries and secondaries.  Mechanical fuel pumps cannot keep this bowl
filled, and electric fuel pumps that can keep an average carb filled run at
a pressure that will blow past the Q-jet needle and seat, wich are only good
to 7 lbs. 
        The Holley has two fuel bowls, one on each end, which can be
extended to hold even more fuel.  Their needle and seats also hold 9 lbs.
and can be replaced with ones that hold up to 12 lbs.
        I am not trying to start an argument, but there are people who
subscribe to this list that run Holleys, and it is not because we can't
figure out a  Q-jet.

Paul Tholey
pft101 at psu.edu