Q-jet experts , couple questions

[Bob Pagano]

"Oh, it's for a bracket car so the "rules" don't apply."

Why run a Q-jet when Holley carbs are a dime a doz. and simpler to tune.

[Mark Yacavone]

Originally Posted by Bob Pagano

"Oh, it's for a bracket car so the "rules" don't apply."

Why run a Q-jet when Holley carbs are a dime a doz. and simpler to tune.

I was wondering the same thing, Bob.


No, you can't remove the tower on a Q jet without making a mess out of it.

[Lynn A McCarty]

Holley simpler to tune? If you call up Mike Beachy and get the hanger adjusting tool he makes, you can tune the carb with simply changing the hanger once you get close with metering rods and jets. I dont see how you can get any simpler than that?

Power? I have been on at least 6 different dynos. A 800 to 850 Holley loses power on our SSers every time. That includes the expensive flowed boosters and all. The only carb that has ever out HPed the Q-jet is the 1150 with all the max tuned flow boosters and venturi. That was only 7HP.

Why do we use the Holley then? For measurements only with the Super Flow air bonnet. It screws with the vent tubes and the secondary air horn. We have found to relocate the air flow mechanism and relocate it as far away from the carb as possible, then making a custom Q-jet carb bonnet helps. The secondary air horn still doesnt like it.

[Bob Pagano]

Lynn its a bracket car, they dont look at the same things we do, it would still be cheaper to run a holley.

[Lynn A McCarty]

I have bracket guys running Q-jets and the love them. You dont have th carry a bucket full of jets and gaskets everywhere you go. You can get away with substandard fuel delivery with a Holley due to the larger fuel bowls and inlets, but otherwise the Q-jet is pretty damn cheap.

I spent a lot of time with the Q-jet guys in Rochester, NY. You guys wouldnt believe the technology of a Q-jet. They still state that the Q-jet was the closest carb to actual fuel injection ever made.

[Mark Yacavone]

For the record, I wasn't advocating a Holley carb for anything, unless the user's application required a bunch more CFM.
I doubt that's the case here.
More specifically, I'd rather see him cobble and hack up a Holley, rather than a good Q- Jet.

[Redlight]

Thanks, so far, I think?

I guess I have to tell he "rest" of the story. I have been running with A Holley.

Trying something different, a set of Q-jets on a old Offy intake.

The carbs are Buick bases, Chevy bodys and Pontiac tops so alot of the cobbling had been done.

I dug around my library and low and behold, found Roe's book circa '81.

Giving myself a refresher.

I will keep them away from the bridgeport for now.

Oh Lynn, they are sitting on a Pontiac!

[Glenn Hayes]

Originally Posted by Lynn A McCarty

I have bracket guys running Q-jets and the love them. You dont have th carry a bucket full of jets and gaskets everywhere you go. You can get away with substandard fuel delivery with a Holley due to the larger fuel bowls and inlets, but otherwise the Q-jet is pretty damn cheap.

I spent a lot of time with the Q-jet guys in Rochester, NY. You guys wouldnt believe the technology of a Q-jet. They still state that the Q-jet was the closest carb to actual fuel injection ever made.

Lynn,
What is the ideal fuel pressure to have for the Q-Jet ?
What is the best S.B. Chevy performance intake manifold to use and modify ?

Glenn

[Redlight]

"Rational" or not , I am going to use the Q-jets.

I would appreciate if we stayed on topic, not Holley vs..........

The fuel system is up to par, all Mallory components, proper size line to and from (return), good wiring etc etc. Fuel is steady and feeds 630 hp just fine.

The present pump is a 140 but have a back up 250 if it is needed.