my compression test results...

Discuss the RB20, RB25 and RB26 series engines.
whoareu
Posts: 163
Joined: Fri Aug 01, 2008 6:09 am
Car: 1993 rb25det s2 240sx vert
Location: Beaufort, SC

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i basically got 130 across all cylinders. this was performed on a warm engine. all were with 5psi of each other.
im pretty much screwed right... i searched and im seeing most healhty engines are seeing between 140 to 160s across all cylinders. being that they are all the same im curious the engine is shot or if its good... perhaps the compression tester just reads low maybe.

what are you gents thoughts???


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Carl H
Posts: 5985
Joined: Mon Aug 04, 2003 4:09 am
Car: 1995 Nissan 240SX SE RB30DET

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it sounds low for sure but it may be the tester.

did you hold the motor at WOT while cranking?
what does your idle vac look like?

RRRRB
Posts: 759
Joined: Wed Jun 01, 2011 9:31 am
Car: 98 RB powered S14
Location: WA

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Do you have stock cams? or adjustable cam gears?

whoareu
Posts: 163
Joined: Fri Aug 01, 2008 6:09 am
Car: 1993 rb25det s2 240sx vert
Location: Beaufort, SC

Post

i did another run on all cylinders with all plugs removed and at WOT and got 150 across all cylinders. which im fairly certian is good. thats a relief.

RRRRB
Posts: 759
Joined: Wed Jun 01, 2011 9:31 am
Car: 98 RB powered S14
Location: WA

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even 135 is acceptable, the main thing is that there all consistent with one another


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