Compression readings... ?? help with interpretation of results please :)

**ozbox** · 22-05-2011, 02:13 PM

Originally Posted by adam perth

fair enough.
i have always used 165 as the standard as thats what a new 308 "crate" motor would get, and anything less than 120 means there is a problem - usually just needs valve relap.
totally agree on the cams, they are only good for 150000 km in my opinion - this goes for the v8 chev stuff too..

if its 150 across the board thats a real good motor...even 125 across is still good..
i find with major differences its crap around the valves so i just give them a wrecking yard tune up...hold it at 4k for 5 minutes plus with a few valve bouncing revs in between and if its not blowing smoke by the end of that its a good useable motor...this also usually cleans crap out of the valve seats and will even up the compressions......

**Vombil** · 09-09-2011, 11:45 PM

just did comp test on my HX Mandarin

180,180,180,178,180,190,180,180

its done 40,000kms since rebuild according to the previous owner. results like these prove it! STOKED!!!!!

ive got a 253 that is meant to be fresh too... apparently was built with brand spankin new block (wouldnt of thought you could buy a new block) post readings soon

**Kiwivan** · 10-09-2011, 02:35 PM

Like ozbox said even if they are all 120's I would be happy,Ours is in the 165-175 range,But that may vary depending on who does it and how,Our Brock is up to 200 and that scares me just a little(all 195 to 198)That motor is just 4000ks old and the van is 2000200ks on her so I recon she is good.And not a tick from the motor.

Cheers Kiwivan