nsta Posted February 20, 2008 Share Posted February 20, 2008 Hey guys, im wanting to know whats a good reading for a compression test on an rb26 engine, i just got a new motor put in, and would like to make sure its going to be healthy for me. Basically the guy i bought it off advised me the readings he got before giving the motor to me were: 165.7 165.8 167.3 170.2 165.1 165.4 Is this a healthy motor?, and i want to do a leakdown just to make sure.... How much will it cost to get a compression test done, and wet/dry leakdown test??? Thanks. Link to comment https://www.sau.com.au/forums/topic/206999-wanting-to-comp-test-out-my-new-rb26-motor/ Share on other sites More sharing options...
The Mafia Posted February 20, 2008 Share Posted February 20, 2008 thats pretty good, maybe even a little bit high for a RB26. My RB25 was 165psi across all 6, and its compression ratio is 9:1. THe RB26 comp ratio is lower so you would expect lower compression test results. As long as they are all equal or within 5% mate. Link to comment https://www.sau.com.au/forums/topic/206999-wanting-to-comp-test-out-my-new-rb26-motor/#findComment-3661485 Share on other sites More sharing options...
rob82 Posted February 20, 2008 Share Posted February 20, 2008 thats pretty good, maybe even a little bit high for a RB26.My RB25 was 165psi across all 6, and its compression ratio is 9:1. THe RB26 comp ratio is lower so you would expect lower compression test results. As long as they are all equal or within 5% mate. Cranking compression has alot more variables than just compression ratio. Link to comment https://www.sau.com.au/forums/topic/206999-wanting-to-comp-test-out-my-new-rb26-motor/#findComment-3661513 Share on other sites More sharing options...
The Mafia Posted February 20, 2008 Share Posted February 20, 2008 true, need a good battery, hot engine, and hold the throttlebody open when cranking. Link to comment https://www.sau.com.au/forums/topic/206999-wanting-to-comp-test-out-my-new-rb26-motor/#findComment-3661516 Share on other sites More sharing options...
N1GTR Posted February 20, 2008 Share Posted February 20, 2008 165.7165.8 167.3 170.2 165.1 165.4 OMG! Nah mate thats terrible, its going to let go soon - take it back and say you changed your mind Im kidding, do a search on comp tests and you will see those numbers are fine. Now go get the keys, take it to a track, and make it earn its keep! Link to comment https://www.sau.com.au/forums/topic/206999-wanting-to-comp-test-out-my-new-rb26-motor/#findComment-3661553 Share on other sites More sharing options...
rob82 Posted February 20, 2008 Share Posted February 20, 2008 (edited) Personally I like the mathematical precision at which the tests were performed. 165.7 on cylinder 1 are you sure it wasn't 165.732 psi? I'd be doing my own test as those firgures sound like he's pulled them out of his arse. Edited February 20, 2008 by rob82 Link to comment https://www.sau.com.au/forums/topic/206999-wanting-to-comp-test-out-my-new-rb26-motor/#findComment-3661572 Share on other sites More sharing options...
nsta Posted February 20, 2008 Author Share Posted February 20, 2008 Thanks - Thats why i will be doing a test myself to make sure his test was correct, or else i will be going back to him questioning everything... Thanks in advice. Link to comment https://www.sau.com.au/forums/topic/206999-wanting-to-comp-test-out-my-new-rb26-motor/#findComment-3661881 Share on other sites More sharing options...
Duncan Posted February 23, 2008 Share Posted February 23, 2008 lol good call rob. hard enough to read most gauges to 1 psi let alone .1 psi..... Link to comment https://www.sau.com.au/forums/topic/206999-wanting-to-comp-test-out-my-new-rb26-motor/#findComment-3669536 Share on other sites More sharing options...
Guilt-Toy Posted February 24, 2008 Share Posted February 24, 2008 my engine has 119.1 120.2 121.3 122.4 123.5 124.6 Link to comment https://www.sau.com.au/forums/topic/206999-wanting-to-comp-test-out-my-new-rb26-motor/#findComment-3669627 Share on other sites More sharing options...
Angus Smart Posted February 24, 2008 Share Posted February 24, 2008 lol good call rob. hard enough to read most gauges to 1 psi let alone .1 psi..... Haha i'm sure mine goes up at 5psi intervals. and so does every other one i have seen. Link to comment https://www.sau.com.au/forums/topic/206999-wanting-to-comp-test-out-my-new-rb26-motor/#findComment-3669760 Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now