Highest comp. ratio on pump gas?

Shawn · 07-18-1999, 01:43 PM

Right now I'm running 10.5:1 on 92octane pump gas...I have a new set of heads I want to put on the car, but with the pistons I have the compression ratio will jump to about 11.25:1 does anyone know if this will work? I have run 11:1 on 92 octane along time ago when the gas wasn't 10% ethanol and all....email me if you can! Thanks

David Gagnard · 07-18-1999, 02:58 PM

Shawn;

You may or may not have problems with that much compression. Seems you are on the edge though and I think you will likely have some problems at some time. 10.5-1 would be the most I would feel comfortable with.

David

------------------
David Gagnard

superpro · 07-19-1999, 11:27 AM

I have seen it work before on a 88 Mustang. He had aluminum heads, Hood scoop (cooler air intake temp), not much timing, and used a bottle of 104 Octane booster in every tank of gas.

I cannot guarantee it will work on your car because of obvious reason---not all 11.25:1 motors are the same.

I would have the heads worked on to reduce the compression to be on the safe side.

Oh try it----you may may work!!!!

Be sure to check your piston to valve clearance.

Good luck.

------------------
347 SVO block, 21# of NOVI boost, Edelbrock heads,150 shot NOS, SVO EPEC, Tremec TKO, Griggs (Torque arm, Panhard bar, Front end), and still street legal. Kinda.

07-18-1999, 01:43 PM	#1
Shawn Registered Member Join Date: Dec 1998 Location: Chicago, IL. USA Posts: 77	Highest comp. ratio on pump gas? Right now I'm running 10.5:1 on 92octane pump gas...I have a new set of heads I want to put on the car, but with the pistons I have the compression ratio will jump to about 11.25:1 does anyone know if this will work? I have run 11:1 on 92 octane along time ago when the gas wasn't 10% ethanol and all....email me if you can! Thanks

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07-18-1999, 02:58 PM	#2
David Gagnard Registered Member Join Date: Jul 1999 Location: Marksville, Louisiana Posts: 17	Shawn; You may or may not have problems with that much compression. Seems you are on the edge though and I think you will likely have some problems at some time. 10.5-1 would be the most I would feel comfortable with. David ------------------ David Gagnard

07-19-1999, 11:27 AM	#3
superpro Registered Member Join Date: Sep 1998 Location: Dallas, TX. USA Posts: 405	I have seen it work before on a 88 Mustang. He had aluminum heads, Hood scoop (cooler air intake temp), not much timing, and used a bottle of 104 Octane booster in every tank of gas. I cannot guarantee it will work on your car because of obvious reason---not all 11.25:1 motors are the same. I would have the heads worked on to reduce the compression to be on the safe side. Oh try it----you may may work!!!! Be sure to check your piston to valve clearance. Good luck. ------------------ 347 SVO block, 21# of NOVI boost, Edelbrock heads,150 shot NOS, SVO EPEC, Tremec TKO, Griggs (Torque arm, Panhard bar, Front end), and still street legal. Kinda.