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I may have misunderstood, but I thought has was asking for cylinder compression, not the overall compression ratio. I'm not 100% positive about this, but I believe with a DET, 140 psi across the board is normal.
 

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Zak91SE-R said:
I may have misunderstood, but I thought has was asking for cylinder compression......
You know, I though he ment that, but I was trying to be a smart ass. I've heard anything under 135psi is bad compression.
 

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140 is about right. I saw some combustion chamber PSI figures from a guy with an NX2000 with an SR20VET in it. Maybe you guys know who I'm talking about. Anyway, his numbers ran anywhere from 140 to 145.
 

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CA18DET Wizard
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Stock Sr20DET compression should be around 170psi (highest) and 130ish/140is as long as each cylinder is within 5% of each other and even so this is the result of a worn engine. Do you have individual cylinder figures? Would help better determine what happened. I bet #2 is the weaker of the bunch...could be wrong though.
 
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