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Forums->Hot Heads Tech Talk->Max Compression ratio on pump gas?

tartar_sammich
Max Compression ratio on pump gas?


We have a 354 Hemi with 11:1 forged true pistons. Can we run it on pump gas? We are trying to save money and want to keep the pistons.
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on: Mon 13 of Jul, 2015 [05:53 UTC] reads: 7692

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Webmaster
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Re: Max Compression ratio on pump gas?
on: Mon 10 of Aug, 2015 [13:56 UTC] score: 0.00
Tarter: With cast iron heads, they like 10 to 1 but over that and you will have detonation problems. I do run 11 to 1 with our aluminum heads. Good luck,
Bob



> We have a 354 Hemi with 11:1 forged true pistons. Can we run it on pump gas? We are trying to save money and want to keep the pistons.

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moparlee
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Re: Re: Max Compression ratio on pump gas?
on: Mon 07 of Aug, 2017 [13:44 UTC] score: 0.00
> Tarter: With cast iron heads, they like 10 to 1 but over that and you will have detonation problems. I do run 11 to 1 with our aluminum heads. Good luck,
> Bob

Hmmmmm.....good to know.

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George
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Re: Max Compression ratio on pump gas?
on: Mon 13 of Jul, 2015 [23:35 UTC] score: 0.00
The general rule of thumb is you can run a 11:1 hemi on the same octane that a 10:1 wedge engine would need.

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hemipwr202
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Re: Max Compression ratio on pump gas?
on: Mon 13 of Jul, 2015 [23:31 UTC] score: 0.00
> Likely gonna have to use sonoco racing fuel sold at the pumps 100+ octane, I think 107. Up here in Wisconsin, it is sold at Kwik Tripand Bs that are fairly cloe to the race tracks.

I'm running 10:1 in a 241 Dodge and have to run Premium the higher the octane the better. 91 to 93.

Todd


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