Compression

Nissan 300ZX technical discussion forum: Maintenance, performance, installations, modifications, how-to's and troubleshooting.
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matt38111
Posts: 19
Joined: Sun May 02, 2010 10:19 pm
Car: 1990 nissan 300zx 2+2 NA

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What is the standard psi compression for a vg30de? Tested
Four cylinders and the front two driver side tested 90 and the the front two passenger side testes 60.

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NolimitZ32
Posts: 7042
Joined: Fri Jun 27, 2008 9:07 am
Car: 91 AG2 2+0 TTMT swap/E39 BMW 540i6/E53 4.6is Dinan S3
Location: Houston, TX

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Either you're doing it wrong or your engine is done, that's way too low. Check FSM for actual numbers, I believe its like 180something on the DE (NA)
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marty1mc
Posts: 733
Joined: Sat Jan 16, 2010 1:51 am
Car: 1990 Nissan 300ZX TT - Z owner since 2003
Location: Fuquay Varina,NC

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NA is 186, minimum is 142. Make sure the car is warm and throttle valves are open, disconnect the CAS. If you readings are that low, I doubt the car would run well. Recheck your gauge, make sure you are getting a seal at the spark plug hole.
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300ZXttZMAN
Posts: 6800
Joined: Mon Nov 22, 2010 4:07 pm
Car: 1990 Nissan 300ZX TT 5spd pearl white

DD: 2008 Nissan Frontier NISMO pkg 4x4 Crew Cab
Location: Sulphur, LA 70665
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Contact 300ZXttZMAN

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Why were you tesing the compression whats the car doing????
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