whats the correct engine psi?

[hyperlight944]

did a compression test on my car and was wondering whats the correct psi ... thanks

cheers

--daniel

[RogueStatus]

cylinder compression test?

[b5s4tt]

within 10-15% of each other from what ive been told

[S4 in_lowplaces]

Post up your numbers and we'll tell you if they're ok

[ThirdStrike]

should be at around 120-150 psi on each. if youre lower than 100 on any 1 cyl youre losing compression somewhere.

[AudiA4_20T]

should be at around 120-150 psi on each. if youre lower than 100 on any 1 cyl youre losing compression somewhere.

that low? Really? Maybe the A4s have higher compression but ~190 is good for us

[ThirdStrike]

that low? Really? Maybe the A4s have higher compression but ~190 is good for us

1.8t is around 180-200 yes but not the 2.7. i may be wrong but all my cyls had 130 on my 2.7... with the exception of the one with a burnt valve which was at 80

[turboquattro068]

last year I did mine and it went 189-187 all the way across I was impressed...........that was at 110k mileage

[ThirdStrike]

last year I did mine and it went 189-187 all the way across I was impressed...........that was at 110k mileage

wow.. hmm.
id figure 9:5:1 comp ratio matching that of a 1.8t would be the same on a 2.7. i wonder why my motor had such low compression. dammit

[S4 in_lowplaces]

your motor is wearing down, it happens to all motors sooner or later. I had compression in the 170-180.

I also think that 120 is too low. Lets just say I'd be worried if i saw anything lower than 150. Motor isnt going to run at its full potential with compression that low

[hyperlight944]

all above 180 except one ... one was 177ish

[JDM EJ1 95]

there is no set number.. it depends on a lot of things when you do the test..


the rule of thumb is within 10% of eachother is good..


anything way off you have issues.

[Daft]

there is no set number.. it depends on a lot of things when you do the test..


the rule of thumb is within 10% of eachother is good..


anything way off you have issues.

Factory 2.7T Specs:

Allowable compression range= 130-188.5Psi
Wear Limit= 101.5Psi (aka. rock bottom)
Max Allowable Difference Between Cylinders= 43.5Psi

[S4 in_lowplaces]

Sweet... Where'd you get that info from?^^^

[AudiA4_20T]

Sweet... Where'd you get that info from?^^^

Daft is like God about the 2.7, he has every brochure, pamphlet, diagram, and write-up that Audi has ever made for the 2.7

[AudiSportB5S4]

lol, true. Brett is the KNOW ALL moderator