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Im currently considerig buying another rb20, the compression results the seller gave me are as follws...

1-130

2-135

3-130

4-130

5-130

6-135

Is it just me or are these numbers a bit low. Im not worried about the difference seen in no2 and 6. I just thought a healthy engine should show compression of maybe 150 - 160? Although seller assures me these number are spot on? test was done on a warm engine

Thanks for your time, Tim

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i have a 1989 rb20det eccs in my HR31 Gts-x

did compression test the other week. the engine is stock, runs normal boost, and runs beautifully. ran 135 on all 6.

my other mates' rb20det silvertop is bout 113 on all 6 and it's unhealthy.

That's very close to what both my RB20's tested at recently..

My gauge has always read low, and seems to read 130psi on a healthy engine. So I wouldn't be too worried.

As long as they are within 10% everything should be fairly fine.

my rb20det with 160 kms on the car had it around 150 to 160 with most on 155

but apparently the engine was rebuilt bout 30thousand kms ago

but i remember somewhere it doesnt really matter as long as there isnt a big difference between the cylinders

might not be a bad idea to pay to get it tested by a mechanic you know

just to elaborate on what i just said th ough, a comrpession test won't pick up everything

i've comp tested ca18det's which were piston slapping pieces of crap and they pulled 165-170psi all round

i've also tested an ex-drifted sr20 which got 165psi but engine ran nice and smoothly, just had been driven on rev-limiter for most of it's life...

  • 5 years later...

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