Highest compression on 93 octane
 

Running 93 octane what is the highest compression I can run on a NA motor with aluminum heads.

Re: Highest compression on 93 octane
 

I ran 10.5:1 on 93 Octane with a solid roller and never a problem...keeping cylinder pressure under control is key.

Re: Highest compression on 93 octane
 

Currently Have 10.7:1 No Problems

Re: Highest compression on 93 octane
 

Are you guys able to readily get 93 octane at the pump? Around here in California-Nevada I haven't seen above 91 octane for several years. Not talking the occasional race pump but premium gas at the average station.

Re: Highest compression on 93 octane
 

EVERY GAS STATION ON THE ROAD IN HOUSTON HAS 93 OC
ON THE WATER IS A DIFF STORY :(

Re: Highest compression on 93 octane
 

That figures. I didn't know different regions were selling different octanes. We pay some of the highest prices here and they're aso slipping us lower octane as premium. Really sucks sometimes to live in the Republic of Kalifornia.

Re: Highest compression on 93 octane
 

93 is not a problem but sunoco ultra 94 is no where to be found

Re: Highest compression on 93 octane
 

What Ever Happened To Amaco Ultimate That Chit Was The Bomb For Pump Gas. I Remember It Had The Little Window On The Handle So You Could See That You Were Pumping Clear Gas.

Re: Highest compression on 93 octane
 

Amoco Ultimate is around. We have it in 92 Octane here and I have seen it in 93 in LOTO/Missouri.

Re: Highest compression on 93 octane
 

Damn i have only seen a few places around me with 91 oct, let alone 93 on the water. with a set of aluminum heads I have seen as much as 11 to 1 with out any problems.. dynamic comp ratio, quench/squish, head material, engine temp, combustion chamber shape, all play an important part, would i run that on the water probably not..