I understand Q-jets

[Paul Tholey]

>If the mechanical fuel pump can't keep one bowl filled, how can it
>keep 2 bowls filled (assuming same rate of consumption & still only
>one fuel pump)?
        The problem is with your acceptance of one mechanical fuel pump
being enough.  The pump runs off the cam.   Therefore the pump is working to
feed 8 cylinders at only 25% of the time, The other 75% of the time it is
idle.  The Holley allows you to run more pressure and at the same time more
volume while not blowing past the needle valve, as would the problem be with
the Q-jet.

Paul
>
 
>>         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
>> 
>
>
>-- 
>Daniel Grambihler
>danielg at eskimo.com
>'87 328 GTS  '95 D90 #3064 '96 900SS/CR
>
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