Compression Test ?

[XBX]

Can anybody tell me what the compression figures are on an STI V7 engine please?

Ive done a test on my car and 3 are reading around 100 and the other is reading about 50?

I dont think Ive done a piston as Im not losing oil and its not smoking, I think it migh possibly be a valve.

Can anybody help?

P.S dont ever fit Bee R rev limiter!!

[dazzlers82]

from what you just put id say you def have a problem with that cylinder mate!!!!!!!!

does it breath at all ???????? (could have done commpression rings on that cylinder my mates skyline just has did not use oil either just broke a lump off corner of piston it did not even knock just started noticin it was breathin heavy

or possibly slightly bent a valve

it sounded ok though when i last heard it ???? not as though it has a bent valve any way unless is very slight????

[granby]

It wouldn't be number 3 cylinder (by the turbo) that has the low compression!!!

[Scooby Hoo?]

It wouldn't be number 3 cylinder (by the turbo) that has the low compression!!!

I bet your right Granby

[dazzlers82]

it could be any from havin that rev limiter on there

[XBX]

from what you just put id say you def have a problem with that cylinder mate!!!!!!!!

does it breath at all ???????? (could have done commpression rings on that cylinder my mates skyline just has did not use oil either just broke a lump off corner of piston it did not even knock just started noticin it was breathin heavy

or possibly slightly bent a valve

it sounded ok though when i last heard it ???? not as though it has a bent valve any way unless is very slight????

Yeah it sounds fine.

Its just when u turn it over it dont sound right.

Its been like it for about a year now, surely if it was a piston it would of broke by now ?

[XBX]

It wouldn't be number 3 cylinder (by the turbo) that has the low compression!!!

Its the one at the back on the other side mate.

[dazzlers82]

Its the one at the back on the other side mate.

number one then could be worn rings but why on that cylinder i dont no have you tried puttin a little oil in that cylinder if the compression comes up its possibly the rings if it doesnt then more likely to be a valve

[Nudge]

spec Figures for a 2002 sti are

Compression test @ 350rpm's with a full open trrottle

951 - 1,147 kpa (9.7 - 11.7 kg/cm2 , 138 - 166 psi )

[dazzlers82]

spec Figures for a 2002 sti are

Compression test @ 350rpm's with a full open trrottle

951 - 1,147 kpa (9.7 - 11.7 kg/cm2 , 138 - 166 psi )

that makes them all low

oh well 2.5 conversion then mate simple

[Nudge]

yes but thats spec when new, they all drop up to 40 psi with wear

[XBX]

spec Figures for a 2002 sti are

Compression test @ 350rpm's with a full open trrottle

951 - 1,147 kpa (9.7 - 11.7 kg/cm2 , 138 - 166 psi )

Thanks mate.

[dazzlers82]

yes but thats spec when new, they all drop up to 40 psi with wear

ok i thought you had posted what subaru say is acceptable

[granby]

yes but thats spec when new, they all drop up to 40 psi with wear

They may well drop but they should all be roughly the same

[XBX]

that makes them all low

oh well 2.5 conversion then mate simple

Its going in to be fixed next saturday, i was just trying to see what its going to need doing.

No piss up next weekend then.

[Nudge]

ok i thought you had posted what subaru say is acceptable

what they do say is anthing over 120 is good as long as they all within approx 7 psi...

[dazzlers82]

Its going in to be fixed next saturday, i was just trying to see what its going to need doing.

No piss up next weekend then.

is wes doin mate or someone else

you upgrading or just repairing ??????

[XBX]

what they do say is anthing over 120 is good as long as they all within approx 7 psi...

They where all just over 100, so it could of been 120ish, i just know one was about 50.

[XBX]

is wes doin mate or someone else

you upgrading or just repairing ??????

Its going to essex, when i know what it needs il see how much cash iv got...

[dazzlers82]

ok mate let me how you get on

[turbo2000wagon]

50 sound iffy, my 99 turbo 2000 did 145 psi on all cylinders( after 120,000 miles). Might be worth rechecking as maybe you got a bad seal on that cylinder with the gauge?