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Low Compression Woes

existence

By existence,
in Engines & Forced Induction

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existence Enthusiast

existence

Posted
Posted

hey guys just put new split fire coil packs in my car and my mate did a compression test on my r25det s2 while he was at it

it got 150 - 150 - 150 - 150 - 100 - 150 - 150

he put oil in the bore and it went up to like 130-140 he said.

He is saying its probably the rings, but best to take it to a shop to find out.

what are my options? how much would it be for a mechanic to rip my engine apart find the problem and fix it?

budget is fairly limited, cheapest safe option here is what im looking for that will fix the problem.

any help / suggestions appreciated

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den001 Proficient

den001

Posted
Posted (edited)

id be checking it out definatly, its only gona get worse, all other cylinders read 150psi, and that one is 100. there should be only 10 percent variance between then in any case...

id be rebuilding it as its obviously not healthy. sorry to inform u mate...

The harder you push it, the worse it will get, you will end up with a massive blow by machine...

do a leakdown test as it could possibly be a bent valve or a head gasket problem... i think its not due to the comp bumping up with the oil test

Edited by den001
GTS4WD Grand Master

GTS4WD

Posted
Posted (edited)

Out a little bit of oil down the spark plug hole and run the test again.

If it comes up with 150, its your rings.

Oh. hahaha.. sorry.. I should start reading threads.

Yes. Rings it is

Edited by GTS4WD
PM-R33 Grand Master

PM-R33

Posted
Posted

Yeah as said above, cheapest option if you don't want to rebuild it is to just buy another engine and then sell off your old one. If you can do the job yourself with mates over a weekend (it aint that hard), it will probably only end up costing you $1000 once you part of the old one.

We did it to my mates a month or so back.

den001 Proficient

den001

Posted
Posted
where can you pick up replacement engines for that price? sounds good.. im just getting my engine tuned and gonna drive it til it doesnt wanna be driven i think -_-

i wouldnt mate, it will get so bad it will start to missfire badly, after this if u give it a good flog you risk blowing the oil up thru the breathers and leaving the sump with f**k all, it will spin a bearing and they you will be up for even more cash to fix it...

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