What's normal/low/high compression for a healthy ka motor

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DRIFTEADOR
Posts: 706
Joined: Thu Dec 16, 2004 6:17 am

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Before I buy it I want to make sure the motor can be boosted. So far I've seen 170psi with ~10% difference between cylinders. sound good? what were your numbers before boosted vs. now? I remember reading somewhere that one member's compression went up after boosted. probably from carbn build up from running rich.


nissanfanatic
Posts: 1314
Joined: Mon Nov 01, 2004 8:41 pm
Car: 1992 Nissan 240sx SE
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Mine was:#1-190psi#2-190psi#3-185psi#4-180psi

After 1000 miles of boosting. 135000 miles on the engine. The tech specs are

Factory-179psiMinimum-151psiMaximum difference between cylinders-14psi

I think my high readings may have something to do with the synthetic oil. Who knows.

DRIFTEADOR
Posts: 706
Joined: Thu Dec 16, 2004 6:17 am

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thanks. do you by chance know the specs for a sr? not really off topic, but probably not the correct forum to ask...

Structure240sx
Posts: 5615
Joined: Sun Oct 06, 2002 5:04 pm

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factory SR compression readings is about 170psi IIRC. theres a chance its 165psi or 175psi. off the top of my head it is 170psi for a perfect motor


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