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Help Interpreting Compression Numbers

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Old 03-25-2010, 06:42 PM
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Help Interpreting Compression Numbers

I'm looking at buying a 2004 RX-8 MT with around 30K miles. I had it inspected, as suggested here on the forum, including a compression test. The dealership provided me with a report showing the compression numbers, and said the engine had good compression. I placed the numbers into 2 of the calculators I found out about through this website, and seemed to get 2 different answers. I wondered if you'd take a look at the report (attached), and tell me what you think. From the report, I take the numbers (compensated to 250 RPM) to be:
Rotor 1:
693
710
692
Rotor 2:
700
736
720

Am I interpreting the numbers correctly? If so, are they OK?
Attached Thumbnails Help Interpreting Compression Numbers-comptest.jpg  
Old 03-25-2010, 06:48 PM
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yes good

move along - nothing to see here


https://www.rx8club.com/attachment.p...6&d=1266716801

Last edited by Brettus; 03-25-2010 at 06:51 PM.
Old 03-25-2010, 09:41 PM
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Those are kPa values. The standard is 830 with a minimum of 680, a chamber difference of 150 and a rotor difference of 100.

Those are good numbers as Brettus suggested but are trending towards the minimum. They are way better than my current '04 engine.
Old 03-25-2010, 09:58 PM
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Great news. Thanks to you both!
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