I understand Q-jets

[Daniel Grambihler]

Paul:

My mistake. When you were referring to the Q-junk & the Helly below I
thought that you brought up the 1 bowl vs 2 bowl as part of the reason
for having one over another. Are there any needle/seat kits avail for the
qj which will handle higher pressure? I have a couple of used quads which
I need to build into one for a s/b bowtie. While I'm in there....

Thanks - Daniel


> 
> 
> >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.
> 
> >>         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
> >
> >
> 


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