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Forced induction compression ratio

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Old Jul 25, 2006 | 03:46 PM
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Default Forced induction compression ratio
What is the highest "SAFE" compression ratio for a forced induction motor? I realize 8.5 or so is a better range.

I am thinking about swapping my 59 cc heads for a set of 72s and adding some sort of supercharger..

Any imput would be appreciated..

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Old Jul 25, 2006 | 03:51 PM
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looks like a street car... id say stick with right around 9.0:1
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Old Jul 25, 2006 | 05:36 PM
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My street car is 8.3 right now
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Old Jul 25, 2006 | 06:03 PM
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street car - 8.2-3:1..... low compression is not very noticable.. esp with boost
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Old Jul 25, 2006 | 06:07 PM
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really depends on what power adder you are using and how much you plan to push it as well as what gas you want to run.
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Old Jul 25, 2006 | 09:03 PM
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Originally Posted by Turbo LS1 SS
street car - 8.2-3:1..... low compression is not very noticable.. esp with boost
esp with a v8
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Old Jul 25, 2006 | 10:20 PM
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I had 9-1, 8-1, 8-5, and am looking to do about 9.5-1 on the next motor that may see a turbo, the jury is still out if that will materailize
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Old Jul 26, 2006 | 09:33 AM
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All the above post assume there will be a piston swap. I have seen alot of Maggies and Prochargers on stock Zo6s.. Compression being about 10.5 -1.

I am "thinking" about 10-1 with the 72 cc heads... I fully understand this is not "optimum".. Is it "doable with a forged motor? If so,, how much boost w/b safe on pump gas?

Thanks again guys.
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Old Jul 26, 2006 | 10:25 AM
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Like PSJ said a long time ago.. It's hard to make a V8 a powerless dog downlow... I say play it safe and just drop those points down, because it won't be too noticeable anyways... 8.3-9.0 TOPS. But I would go with 8.5
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