Compression ratio

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Compression ratio

Post  fordguy69 on January 21st 2013, 9:39 pm

I have a set of SRP 150723 flat top pistons. They list the compression numbers as follows: 72 cc/11.7 80cc/11.0 84cc/10.1

Anybody have any idea what CR they would make with 95cc heads?

Thinking of using these with Edelbrock 95cc heads for a street build to replace the one I damaged today.


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Re: Compression ratio

Post  dfree383 on January 22nd 2013, 12:13 am

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Re: Compression ratio

Post  fordguy69 on January 22nd 2013, 9:30 pm

Just got an email back from SRP tech and they said with 95cc heads CR would be 9.8 to 1.

That doesn't sound right to me?

72 cc/11.7 80cc/11.0 84cc/10.1 95cc/9.8

From 80 to 84 drops compression .9 but from 84 to 95 only drops it .3?

I think he may have meant 8.9.

I guess I'll have to do some cypherin' myself. It makes my head hurt when I have to use Pi.




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Re: Compression ratio

Post  OldRed70 on January 22nd 2013, 9:54 pm

I had the same pistons and Edelbrock 95 cc heads with 0 deck block and 0.045 compressed gasket mine was
9.7 to 1
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Re: Compression ratio

Post  fordguy69 on January 22nd 2013, 11:00 pm

OldRed70 wrote:I had the same pistons and Edelbrock 95 cc heads with 0 deck block and 0.045 compressed gasket mine was
9.7 to 1

How did the engine perform? I am thinking of using the above with an RPM Airgap and their Performer RPM juice cam.

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