jasonk-2009
Member
Registered: 19th Dec 13
User status: Offline
|
doing a compression test tomorrow on my corsa b 1.4 sport (x14xe). anyone know what the compression readings on a healthy engine should be. have looked and cant find the information any ware.
|
corsa-torque
Member
Registered: 15th Mar 11
User status: Offline
|
As long as they are roughly the same I wouldn't worry to much, I have a Haynes manual, i'll have a look later on
|
jasonk-2009
Member
Registered: 19th Dec 13
User status: Offline
|
cheers mate
|
corsa-torque
Member
Registered: 15th Mar 11
User status: Offline
|
Just had a look and lists no actual values, just states how to do the procedure and what certain drops in compression mean.
|
dewismotorsport
Member
Registered: 16th Feb 08
Location: Coventry & Poole
User status: Offline
|
Ideally 140 and above, ultimately want them as close to each other across all 4 cyclinders. Do a dry test and then a wet test (poor cap full of oil in each cyclinder as you go and then test) and compare both dry and wet readings
|
jasonk-2009
Member
Registered: 19th Dec 13
User status: Offline
|
ok test results
(dry) cylinder 1 50psi
cylinder 2 50psi
cylinder 3 50psi
cylinder 4 50psi
(wet) cylinder 1 60psi
cylinder 2 60psi
cylinder 3 75psi
cylinder 4 75psi
it was only a cheap testing kit but what are your thoughts...rings(bore), valves/ stems seals, or head gasket..
|
jasonk-2009
Member
Registered: 19th Dec 13
User status: Offline
|
engines only done 64k
|
dewismotorsport
Member
Registered: 16th Feb 08
Location: Coventry & Poole
User status: Offline
|
Seems very low how long did you crank each cyclinder over for? For a 64k I'd expect higher unless head has valve damage, rings wouldn't wear out that fast and highly unlikely head gasket would go on all cyclinders at the same time
|
dewismotorsport
Member
Registered: 16th Feb 08
Location: Coventry & Poole
User status: Offline
|
Has the changed? Check it all lines up with all the marks again, as it may have clipped the valves
|
jasonk-2009
Member
Registered: 19th Dec 13
User status: Offline
|
cranked until it would not move any higher
|
jasonk-2009
Member
Registered: 19th Dec 13
User status: Offline
|
about 5 seconds each cylinder
|
jasonk-2009
Member
Registered: 19th Dec 13
User status: Offline
|
in middle of taking head of know , ball ache got rocker cover and top inlet off so far
|
Corsa_Sport21
Member
Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
User status: Offline
|
Did you do it with all the spark plugs removed??
Why are you doing a compression test anyway?? Does it have a problem.
|
jasonk-2009
Member
Registered: 19th Dec 13
User status: Offline
|
it has white smoke from exhaust and missis every now and again.
|
jasonk-2009
Member
Registered: 19th Dec 13
User status: Offline
|
yes all plugs removed and fuel depressurised
|
dewismotorsport
Member
Registered: 16th Feb 08
Location: Coventry & Poole
User status: Offline
|
Sorry earlier comment had the word 'timing' missing.
Quick test for the valve once the head is off, put it upside down turn cams until all valves are closed on each cylinder (one at a time) and fill the chamber with petrol and see how long it takes to empty, if it's very quick you have damaged valves or they need a re lap
|
