compression engine

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Oct 20, 2011 | 10:50 AM

nanard77

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6th Gear

Joined: Jan 2011

Posts: 13

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From: Europe

compression engine

Hi

2009 stock engine with stock pistons, how I can get the compression ratio.
I want to about 9:48, working the head

What do you think?

Oct 20, 2011 | 02:13 PM

djl

HDF Community Team

Joined: Jun 2006

Posts: 12,763

Likes: 2,596

From: san antonio

Quote:

Originally Posted by nanard77

Hi,
2009 stock engine with stock pistons, how I can get the compression ratio.
I want to about 9:48, working the head. What do you think?

You can go to the BigBoyz website and use their compression calculator.

http://www.bigboyzheadporting.com/TwinCamComp.htm

In stock configuration, static compression is about 9.25. Replace the stock head gasket with a .030" Cometic gasket will boost that up to 9.5 as well as tighten up the squish.