quote:

Originally posted by TOP38:

quote:

Originally posted by mopar man:
So are you saying that my Pro systems carburetor that they just built me with a power valve in front is not necessary? I thought I would run it like that see how it responds. This is a full drag car 8500 RPM

Are you asking me??? If so, I was pretty clear in my post above.

However I will add this, for foot brake folks, when staging, if they are only lightly loading the converter,,, keeping the manifold vac high, a power valve could actually help but that not to say a carb cannot be built to work cleanly without a PV.

A power valve will only provide a leaner AFR under light engine loads (high vac conditions) when the main circuit is flowing fuel. Once load increases enough to drop manifold vac enough to open the valve, its just there for the ride.

As for a drag car, fuel slosh in the float bowls can under either the PV and or jets, and since the PV is higher than the jets, its more likely to get uncovered during a run vs the jets. Give this fact and that fuel slosh is not a constant! from run to run, why add more potential issues that could cause inconsistencies? That's my two cents.

quote:

Originally posted by 1320racer:
you're making a blanket statement, he does NOT put PVs in all "drag cars" and specifically not in all bracket cars running a dominator.

That said, I have yet to find one custom carb builder who's carb outperforms Pro Systems comparing same size carbs.

quote:

Originally posted by mopar man:
I've never ran a power valve in my drag motor either. And this is a trans brake car. I just figured the carb builder at Pro systems knew what he was doing?

quote:

Originally posted by 1320racer:
Which car?

quote:

Originally posted by mopar man:
I've never ran a power valve in my drag motor either. And this is a trans brake car. I just figured the carb builder at Pro systems knew what he was doing?

I suggest you call Pro Systems and speak to either Patrick or Brad and ask them WHY your carb has a PV.

quote:

Originally posted by CURTIS REED:
The Firebird

quote:

Originally posted by 1320racer:
specifically what carb did he build you and for what application?

quote:

Originally posted by 1320racer:
so it's an 1150 dominator?

quote:

Originally posted by mopar man:

quote:

Originally posted by 1320racer:
Which car?

quote:

Originally posted by mopar man:
I've never ran a power valve in my drag motor either. And this is a trans brake car. I just figured the carb builder at Pro systems knew what he was doing?

I suggest you call Pro Systems and speak to either Patrick or Brad and ask them WHY your carb has a PV.

i already did and he said these carbs have a lot of signal and would be cleaner at part throttle

quote:

Originally posted by 1320racer:

quote:

Originally posted by CURTIS REED:
The Firebird

as I've stated many times here when discussing the performance of my footbrake launched Firebird, that it is run with a restrictor plate, dialed in to run 9.0x/5.7x because the NHRA Division 1 cutoff for Pro ET is 9.00.

That said, I have run as quick as 8.72/5.50 and this is with a Pro Systems 4150/1000HP...

quote:

Originally posted by 1320racer:
restrictor plate set for 9.0x ET MPH is 119/149. Restrictor plate opened 123/154

quote:

Originally posted by mopar man:

quote:

Originally posted by 1320racer:
so it's an 1150 dominator?

yep he said it flowed 1192 cfm

quote:

Originally posted by CURTIS REED:

quote:

Originally posted by 1320racer:
restrictor plate set for 9.0x ET MPH is 119/149. Restrictor plate opened 123/154

Thanks that is pretty good mph.

quote:

Originally posted by 1320racer:

quote:

Originally posted by CURTIS REED:
The Firebird

as I've stated many times here when discussing the performance of my footbrake launched Firebird, that it is run with a restrictor plate, dialed in to run 9.0x/5.7x because the NHRA Division 1 cutoff for Pro ET is 9.00.

That said, I have run as quick as 8.72/5.50 and this is with a Pro Systems 4150/1000HP...