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Old 10-30-2006, 01:42 PM
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Default Highest compression on 93 octane

Running 93 octane what is the highest compression I can run on a NA motor with aluminum heads.
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Old 10-30-2006, 02:12 PM
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Default 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.
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Old 10-30-2006, 02:36 PM
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Default Re: Highest compression on 93 octane

Currently Have 10.7:1 No Problems
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Old 10-30-2006, 04:09 PM
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Default 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.

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Old 10-30-2006, 04:49 PM
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Default Re: Highest compression on 93 octane

Originally Posted by zahndok
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.
EVERY GAS STATION ON THE ROAD IN HOUSTON HAS 93 OC
ON THE WATER IS A DIFF STORY
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Old 10-30-2006, 04:59 PM
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Default 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.
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Old 10-30-2006, 05:15 PM
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Default Re: Highest compression on 93 octane

93 is not a problem but sunoco ultra 94 is no where to be found
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Old 10-30-2006, 05:39 PM
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Default 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.
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Old 10-30-2006, 06:33 PM
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Default 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.
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Old 10-30-2006, 06:48 PM
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Default 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..
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