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Compression Test For Rb20det


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ey guys,

did a compression test today, however, i disconnnected every hose when i removed the intake manifold and removed all the spark plugs, then i performed the compression test.


1. 146 PSI

2. 145 PSI

3. 147 PSI

4. 145 PSI

5. 146 PSI

6. 145 PSI

i dunno wat the go is.. And is this the way u do a compression test or not? by removing all park plugs and then cranking it?

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ok....so keep all plugs in, take one out, test it, then put it back it, then take the next one out and test it yer? do i loost compression when all spark plugs r out? coz i just cranked it till it popped...

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Depends on how your gauge reads dude. A lot of low qual gauges about that read way off.

Also rb20 donk is fairly low comp I'd expect 130 - 150.

You look more for variation. The readings on your engine are awesome !!

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around 150psi is normal for the age the engine,manual specifies 170psi with the limit value (lowest) 128psi, the variance limit shouldnt be more than 14psi beween cylinders

u should have the engine close to operating temp at least, remove ALL plugs, attach gauge to cylinder (screw fitting is the better ones), depress pedal FULLY u must have WOT, crank till needle stops moving which should be about 7 engine revolutions, then record ur readings,

urs seem good not much variation which is good

im not sure if the readings will be lower or higher when stone cold as i have only done it when at operating temp.

maybe someone can verify that as my engine is not finished yet to be running



Edited by RB20/30Det_VL
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