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Old 03-20-2013   #4
LingLing
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Join Date: Feb 2006
Location: Stillwater
Drives: '03 325i, '98 Ranger '03 Duramax
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Re: Determining Compression Ratio

I've seen two answers related to my setup.

1) Compression stays the same since the combustion chamber volume is the same.

2) Compression is lowered because DOHC EJ25 heads have a larger combustion chamber volume than the EJ22T.

Maybe I'll just go out and buy a few Haynes manuals today. IIRC they include all specs, such as this.
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