gas carb?

[TinSoldier 3215]

we had a alcohol carb on the car and ran great and then put a gas carb on and the car fell off 3 ten's. the gas is the some size as the alcohol any in put why it slowed down? thank's

[Floyd Gomez]

Originally Posted by jonesracing

we had a alcohol carb on the car and ran great and then put a gas carb on and the car fell off 3 ten's. the gas is the some size as the alcohol any in put why it slowed down? thank's

There is alot of info missing. Did you simply swap the carb and fuel? Did you make timing adjustments to compensate for a slower burning fuel? What type of carbs? Jet size? etc? Did you switch to pump gas or race fuel? Alcohol burns cleaner and faster. If the car was set up for Alky it takes more than switching a carb to get the same results.

[TinSoldier 3215]

the gas carb haves 83 in front and 83 in backs carb is a 930 it haves racing fuel in it and no timing adv/retart and it is running out of fuel at the 2cars from the 1/8. the carb is a chuck nutton. it is slow from last year across the broad 60 ft. 330 and 1/8 and speed. the carb is a 750 bore to 930. thank's

[Floyd Gomez]

Try 87's in the front and 92's in the back. You may have to go to 90 squared or 92 squared if it still runs out of fuel on the top end. If it loads up with the 87's drop to 85's and 90 to 92's in the rear.

[TinSoldier 3215]

how much fuel pursure do you have to have with a belt drive pump to fuel a gas carb? when we got the carb from chuck it had 73's in the front at 80's in the rear. we switch to 83 front and back and it haves a power valve in it. why? the fuel pursure is more than 8 pounds. thanks.

[Floyd Gomez]

3 to 5 max. anything over 6 usually causes problems. Power valve is builder choice.

[WDCreech]

Originally Posted by Floyd Gomez

3 to 5 max. anything over 6 usually causes problems. Power valve is builder choice.

With a Q-Jet or a Carter, maybe, but not with a Holley. I run between 7 and 7-1/2 lbs in both my Dominators and square bores.

[Floyd Gomez]

Is that before or after the split? I ran 5.5 to my holley 1050 doms on my old bracket car anf worked fine. Anything over 6 gave me trouble.

Originally Posted by WDCreech

With a Q-Jet or a Carter, maybe, but not with a Holley. I run between 7 and 7-1/2 lbs in both my Dominators and square bores.

[carbman1]

Alcohol will almost always pick a car up.2 to.3 methanol burns slower as well as making more torque . You burn 11/2 to 2 times more fuel by compressing and burning a more dense mixture this gives the sensation of having more compression. methanol produces a smoother and more forgiving torque curve and will equal or make more HP than gasoline (That is if the fuel delivery system, carb and ignition are correct)
THANKS

[WDCreech]

Originally Posted by Floyd Gomez

Is that before or after the split? I ran 5.5 to my holley 1050 doms on my old bracket car anf worked fine. Anything over 6 gave me trouble.

I have two regulators. one for the primaries of both carbs, and one for the secondaries.