Compression Test For Rb20det

[RB20JT]

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.

Cylinder:

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?

[quick31]

your motor is fine dude nice even pressure across all cylinders

[RB20JT]

whats std psi pressure for rb20det's? anyone know?

[James_03]

Im not entirely sure why you removed the intake manifold. All you need to do is take the valley cover off, remove coil packs then take each plug out as you test that cylinder.

[RB20JT]

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...

[blind_elk]

A compression test is most meaningful when the engine is near normal operating temp, and you have WOT while cranking.

I guess no manifold is the next best thing to WOT.

[RB20JT]

what is WOT???? IM LOST

[NathR32]

Wide Open Throttle

[Simon-S14]

either way, the figures are all even and close to each other, so im sure its fine

[RB20JT]

wat should they be though? i heard sumthing between 160-180 psi per piston....doesnt that mean that mine is shit@!!

[Butters]

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 !!

[Butters]

Double post sorry.

Edited December 11, 2006 by Butters

[32DET]

Seems fine to me mate,

when i did mine i got readings ranging between 150 and 155 so fairly similar.

Cheers

Ryan

[RB20/30Det_VL]

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

cheers,

brad

Edited December 11, 2006 by RB20/30Det_VL

[1kool34]

Yeah mate they seem fine. They are almost identical to my results. I wouldn't worry to much mate