Compression test graph... how am I doing? [pic]
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Compression test graph... how am I doing? [pic]
Just got S4 Turbo engine compression tested, just wondering how to interpret this correctly...
From what I can see, both rotors are way above 85 psi, so its not doing too badly?
The difference between the 2 is not too much either, and all peaks are pretty much even.
Thoughts?
Cheers!
Paul.
From what I can see, both rotors are way above 85 psi, so its not doing too badly?
The difference between the 2 is not too much either, and all peaks are pretty much even.
Thoughts?
Cheers!
Paul.
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from my calculations:
even compression over rotor faces. Rear: ~100psi / Front ~108psi (min spec is 85psi)
difference between rotors ~8psi (max allowable spec is 21 psi)
So im thinking it looks good.
Went to a dodgy guy to do a look over on the car and he said this was poor compression lol.. i think he is messed up
even compression over rotor faces. Rear: ~100psi / Front ~108psi (min spec is 85psi)
difference between rotors ~8psi (max allowable spec is 21 psi)
So im thinking it looks good.
Went to a dodgy guy to do a look over on the car and he said this was poor compression lol.. i think he is messed up
#5
Anytime baby!
Here's mine!
I think those are good numbers...it's an SE engine, I'm hoping for at least 200,000 miles.
http://brownmound.com/engine03/itstarts.html
Right on.
I think those are good numbers...it's an SE engine, I'm hoping for at least 200,000 miles.
http://brownmound.com/engine03/itstarts.html
Right on.
#6
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brownmound, I noticed that "ATF" raised your compression numbers, but there was talk that ATF (or any oil really) only raised comp temporarily. I'd be interested to know if your numbers stayed that high on the rear rotor. If they did, it could be imperical proof that using some form of penetrating oil or cleaner can help a tired old engine!
Jon
Jon
#7
Anytime baby!
Originally Posted by vipernicus42
brownmound, I noticed that "ATF" raised your compression numbers, but there was talk that ATF (or any oil really) only raised comp temporarily. I'd be interested to know if your numbers stayed that high on the rear rotor. If they did, it could be imperical proof that using some form of penetrating oil or cleaner can help a tired old engine!
Jon
Jon
Right on.
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#9
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Now that the image finally loads for me, I'd say that's a forkin' awesome test result.
I'm absoloutely amazed at how EVEN your points are between the three faces of each rotor. The 8psi difference between the two rotors isn't very large, and definitely within spec. There was a thread at one point speculating that there must be some different forces at work on the rear rotor because someone had blown three engine, all rear rotors! Either way, with comp numbers that high, it looks great.
But I will say that I don't know what the compression ratio or expected numbers are for an S4 Turbo engine. Those numbers are as high or higher than what I'd expect to see off an FB engine. I thought the turbo engines were supposed to have low comp rotors, and if that's a test with low comp rotors, I'd want to know what high comp rotors looked like on a test!
You sure it's not an N/A engine?
Jon
Edit: I'm going to make a copy of this and send it to the 2nd Gen Forum because it's a second gen engine, they'd know more about what the comp test should look like for this engine. I'll leave a copy here since people seem to be interested. So head over there and take a look-see.
I'm absoloutely amazed at how EVEN your points are between the three faces of each rotor. The 8psi difference between the two rotors isn't very large, and definitely within spec. There was a thread at one point speculating that there must be some different forces at work on the rear rotor because someone had blown three engine, all rear rotors! Either way, with comp numbers that high, it looks great.
But I will say that I don't know what the compression ratio or expected numbers are for an S4 Turbo engine. Those numbers are as high or higher than what I'd expect to see off an FB engine. I thought the turbo engines were supposed to have low comp rotors, and if that's a test with low comp rotors, I'd want to know what high comp rotors looked like on a test!
You sure it's not an N/A engine?
Jon
Edit: I'm going to make a copy of this and send it to the 2nd Gen Forum because it's a second gen engine, they'd know more about what the comp test should look like for this engine. I'll leave a copy here since people seem to be interested. So head over there and take a look-see.
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