GD51LA Posted July 5, 2013 Share Posted July 5, 2013 is it my rings? 1'2'3'4'5 are 175, throttle flat number 6 is 110? put 5ml of oil in number 6 went from 110psi to 130 put 5ml in number 5, went from 175psi to 205psi are their any other tests i can do? low kilometre standard engine Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/ Share on other sites More sharing options...
GTSBoy Posted July 5, 2013 Share Posted July 5, 2013 Could be rings, but you'd expect a much bigger improvement on #6 than on one of the good cylinders on the wet test. So on that basis you'd expect a BHG or bad valve or something else (like all the bad options like a cracked piston, cracked head, etc etc). Valve most likely. Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6916712 Share on other sites More sharing options...
Simon-S14 Posted July 5, 2013 Share Posted July 5, 2013 do a leak down test to confirm what it is exactally Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6916739 Share on other sites More sharing options...
Adriano Posted July 5, 2013 Share Posted July 5, 2013 most likely broken ringland Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6916764 Share on other sites More sharing options...
portaz Posted July 5, 2013 Share Posted July 5, 2013 Or dodgy comp tester 205psi for rb26 seems very high Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6916805 Share on other sites More sharing options...
fatz Posted July 5, 2013 Share Posted July 5, 2013 Rebuild Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6916818 Share on other sites More sharing options...
GTR_JOEY Posted July 5, 2013 Share Posted July 5, 2013 possible ring land.. no6 needs that extra fuel.... it hot back there Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6916936 Share on other sites More sharing options...
500hp Posted July 5, 2013 Share Posted July 5, 2013 Yeah man that's def a cracked ring land do not thrash the car or boost it drive it normal until rebuild RINGLAND!! Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6917112 Share on other sites More sharing options...
Guilt-Toy Posted July 7, 2013 Share Posted July 7, 2013 warm the car up, and test it again. i once had a cyl read 80 when the rest were 130, then i tested it again 2 weeks later and that cyl was back to normal again. have no Fn idea why. tested it after i purchased new engine internals btw. guess they were not needed... at least for a few months after when something else let go Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6918471 Share on other sites More sharing options...
r33_racer Posted July 7, 2013 Share Posted July 7, 2013 +1 Leak down test. Find exactly where the problem is instead of guessing. Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6918995 Share on other sites More sharing options...
luke gtr Posted July 7, 2013 Share Posted July 7, 2013 keep running until it gets worse, then rebuild or replace with a good 2nd hand unit. Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6919045 Share on other sites More sharing options...
Blackkers Posted July 11, 2013 Share Posted July 11, 2013 (edited) DISCLAIMER: I may be wrong (If I am please someone correct me, I love learning about this shit) Your wet test results showed a bigger improvement on a normal cylinder (weird right?). This suggests that your cylinder bore in #6 is likely okay; it points towards head gasket problems or something in the head. I'm no guru but I'd be checking for symptoms of head gasket problems first as they stick out like a sore thumb. edit: also I just wanted to mention that those comp. numbers sound a bit high. Anyone else think the same? Edited July 11, 2013 by Blackkers Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6923805 Share on other sites More sharing options...
Sinista32 Posted July 11, 2013 Share Posted July 11, 2013 (edited) Edit - just did a search on here and what I thought was wrong Edited July 11, 2013 by Sinista32 Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6923928 Share on other sites More sharing options...
Sinista32 Posted July 11, 2013 Share Posted July 11, 2013 (edited) Deleted* Edited July 11, 2013 by Sinista32 Link to comment https://www.sau.com.au/forums/topic/428117-rb26-compression-test-no6-very-low-all-175-no6-is-110/#findComment-6923937 Share on other sites More sharing options...
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