Moorron
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| posted on 16/10/09 at 04:40 PM |
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compression test done, now what?
Evening lads, after fitting my new engine over last xmas and enjoying using it this year i was concerned at it eating 1000ml ever 300 miles. so
eventually tonight i tested its compression with my new tester and the results are:
1=210 psi
2=165 psi
3=162 psi
4=210 psi
this was done on a warmed up engine. Looking at the service manual the range i can work in is 149-228 psi. so i am in the workable range but with the
inner cylinders having much less than the outer ones.
So is it a rebuild? and should i just replace the inner rings or do the lot?
or just leave it and rag it more.
also in the service book it doesnt suggest glaze busting the cylinders anywhere, do i need to do this on this engine (if scratched then always yes)
but if its just worn rings is it a real no no to just replace them with new and thats it?
help required.
many thanks
Andy
Sorry about my spelling, im an engineer and only work in numbers.
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Hellfire
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| posted on 16/10/09 at 04:43 PM |
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Still within tolerance so just rag it some more. 
Phil
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austin man
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| posted on 16/10/09 at 04:50 PM |
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I saw hellfires ZX use 4.5 litres in around ten seconds and its still runs so yours is a small quantity.
lol
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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Hellfire
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| posted on 16/10/09 at 05:10 PM |
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Theshed
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| posted on 16/10/09 at 05:34 PM |
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Sure its the rings? Adjacent cylinders could be a weak gasket or valves - have you re-tested with a few drops of oil down each bore?
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Moorron
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| posted on 16/10/09 at 05:49 PM |
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oh damn it i forgot to do that, well something for the weekend then.
if it was the gasket would it not use any oil? i checked all the valve clearances and only one is out of tol and it just out this is on the good
pessure cylinder.
I cant see smoke while driving, but i can smell it on overrun, i stopped in a layby the other day and revved it onto the limiter and as i backed off i
could then see white smoke on the overrun.
i can live with it, only doing low mileage a year, but if its not right im the type to make it right.
so what happened then hellfire? forgot the sump plug lol
Sorry about my spelling, im an engineer and only work in numbers.
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Hellfire
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| posted on 16/10/09 at 06:29 PM |
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quote:
Originally posted by Moorron
so what happened then hellfire? forgot the sump plug lol
Overtaking a few cars and the oil filter decided to unscrew itself whilst doing about 80mph @11,000rpm. Lots and lots of white smoke. 
Phil
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austin man
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| posted on 16/10/09 at 06:36 PM |
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the white smoke was not smoke when it was all over the front of our cars and on our glasses lol
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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britishtrident
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| posted on 16/10/09 at 07:51 PM |
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I would retest it in case you have a duff result --- 210 psi is really very very high for a pre-used Pinto no matter what the book says.
162 & 165 are actually quite reasonable results.
On a near perfect Pinto I would not expect to see more than about 185 psi --- but it varies with weather conditions more than you might suspect.
Usually oil consumption problems don't show up on a compression test --- excessive oil consumption (with no other symptoms ) due to worn or
stuck rings is usually down to the oil control ring which plays no part in compresion. Or it could be a valve guide or breather problem.
What were the plug colours like on the cylinders and is the sump pressurising ?
[Edited on 16/10/09 by britishtrident]
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DRC INDY 7
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| posted on 16/10/09 at 08:16 PM |
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Only 11,000 rpm sounded like a lot more still it was fun trying to brake on oil covered tarmac
https://www.facebook.com/groups/462610273778799/
Puddle Dodgers Club
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austin man
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| posted on 16/10/09 at 08:41 PM |
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http://www.youtube.com/watch?v=UR0AYF_3A8k
Have a look see at the mess he left, just glad Dale was in front of me this time
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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Moorron
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| posted on 16/10/09 at 09:04 PM |
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sorry lads, its not a pinto but a ZX12R bike engine. maybe the engine has been on its side for a while and the oil control ring is stuck?
other prob is i have removed the kleen air valve on the top of the engine, so maybe this is creating a problem. However the sump pressure looks fine
as my breather is clean and relativly dry.
hellfire did the engine survive? did you not tighten the oil filter? im off to check mine now lol.
Sorry about my spelling, im an engineer and only work in numbers.
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Breaker
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| posted on 16/10/09 at 09:30 PM |
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Was the test with wide open throttle ? For compression test it is also very important to look at the gauge movement at the first compression stroke.
The first compression should give a rather "big" needle movement compared to the following ones.
If possible, also do a leak-test, to do some more analysis.
edit: just looking at your pictures, it looks like you have a turbo. Did you remove the intercooler connection/plenum, so the engine can breathe
freely ?
[Edited on 16/10/09 by Breaker]
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Canada EH!
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| posted on 16/10/09 at 09:35 PM |
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White smoke usually means water, possibly the head gasket has gone between the two centre cylinders.
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Moorron
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| posted on 17/10/09 at 01:39 PM |
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its not water, im not loosing any. its defo oil but unsure thru what.
Sorry about my spelling, im an engineer and only work in numbers.
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