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  Compression ratio test results interpretation

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Author Topic:   Compression ratio test results interpretation
Pierre
Gearhead

Posts: 354
From: France
Registered: Apr 2002

posted 08-30-2002 11:36 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
I tested my SB for compression (engine cold, I will probably re-do it when warm !!)

min cylinder was 155 psi, max was 165. I guess these numbers will climb with a warm engine.

Are these figures normal (is engine healthy)?
And can I get an estimation on the static comp ratio from these numbers (cam is 214/224 @0.050) ?

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69 Sportsroof
Gearhead

Posts: 960
From: Valley, Alabama, USA
Registered: Mar 2002

posted 08-30-2002 02:10 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
You definately want to do the check with the engine warm. What you are looking for is not a specific psi rating but one that is fairly consistant across all 8 cyliners. Somewhere around 5 to 7 % difference.

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