RB20JT Posted December 9, 2006 Share Posted December 9, 2006 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? Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/ Share on other sites More sharing options...
quick31 Posted December 9, 2006 Share Posted December 9, 2006 your motor is fine dude nice even pressure across all cylinders Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2737758 Share on other sites More sharing options...
RB20JT Posted December 9, 2006 Author Share Posted December 9, 2006 whats std psi pressure for rb20det's? anyone know? Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2737762 Share on other sites More sharing options...
James_03 Posted December 9, 2006 Share Posted December 9, 2006 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. Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2737826 Share on other sites More sharing options...
RB20JT Posted December 9, 2006 Author Share Posted December 9, 2006 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... Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2737840 Share on other sites More sharing options...
blind_elk Posted December 9, 2006 Share Posted December 9, 2006 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. Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2737851 Share on other sites More sharing options...
RB20JT Posted December 9, 2006 Author Share Posted December 9, 2006 what is WOT???? IM LOST Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2738298 Share on other sites More sharing options...
NathR32 Posted December 9, 2006 Share Posted December 9, 2006 Wide Open Throttle Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2738302 Share on other sites More sharing options...
Simon-S14 Posted December 9, 2006 Share Posted December 9, 2006 either way, the figures are all even and close to each other, so im sure its fine Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2738364 Share on other sites More sharing options...
RB20JT Posted December 10, 2006 Author Share Posted December 10, 2006 wat should they be though? i heard sumthing between 160-180 psi per piston....doesnt that mean that mine is shit@!! Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2740210 Share on other sites More sharing options...
Butters Posted December 11, 2006 Share Posted December 11, 2006 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 !! Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2740369 Share on other sites More sharing options...
Butters Posted December 11, 2006 Share Posted December 11, 2006 (edited) Double post sorry. Edited December 11, 2006 by Butters Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2740382 Share on other sites More sharing options...
32DET Posted December 11, 2006 Share Posted December 11, 2006 Seems fine to me mate, when i did mine i got readings ranging between 150 and 155 so fairly similar. Cheers Ryan Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2740732 Share on other sites More sharing options...
RB20/30Det_VL Posted December 11, 2006 Share Posted December 11, 2006 (edited) 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 Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2741604 Share on other sites More sharing options...
1kool34 Posted December 12, 2006 Share Posted December 12, 2006 Yeah mate they seem fine. They are almost identical to my results. I wouldn't worry to much mate Link to comment https://www.sau.com.au/forums/topic/146595-compression-test-for-rb20det/#findComment-2744701 Share on other sites More sharing options...
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