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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 04-03-2010, 09:51 PM
tim96 tim96 is offline
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Mein Auto: bmw e30 320i
compression test results

Out of interest i did a compression test today what do you make of these readings..the cars has 130,000 k on it (80,778 miles), m20b20 motor
Cylinder 1 . 190 psi / 13.10 bar
Cylinder 2 . 179 psi / 12.34 bar
Cylinder 3 . 165 psi / 11.38 bar
Cylinder 4 . 170 psi / 11.72 bar
Cylinder 5 . 180 psi / 12.41 bar
Cylinder 6 . 190 psi / 13.10 bar
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  #2  
Old 04-27-2010, 08:43 PM
greasygas greasygas is offline
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I you should be pretty happy with that or ? was it a wet or dry test ?
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Old 04-27-2010, 09:17 PM
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hornhospital hornhospital is offline
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The difference between cylinders 1/6 and cylinder 3 is more than three times the allowable range according to Bentley. Supposed to be no more than 7 psi between any two cylinders. With that said, if it runs OK, don't worry about it. Now I bet you wish hadn't found out.
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Old 04-27-2010, 09:32 PM
greasygas greasygas is offline
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OK I see ..on a small block chey that would be acceptable for sure ! like you said if it runs ok thats all that matters!
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Old 05-06-2010, 04:41 PM
tim96 tim96 is offline
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it was a dry test and it runs ok. So what could the difference mean?
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Old 05-06-2010, 08:50 PM
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hornhospital hornhospital is offline
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The rings are worn more on cylinders 3 an 4 than on the others, or there's more carbon build-up in cylinders 1,2 5, and 6 than 3 and 4, but that's pretty unlikely.

Do you see the anomoly in those figures? The end cylinders have the highest pressure, and it drops almost identically as you go toward the center of the block. I can't explain it, but it's pretty obvious.
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Quotes to live by:
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1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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Old 05-06-2010, 08:53 PM
mujjuman mujjuman is offline
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Agree.
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Old 05-07-2010, 09:00 PM
tim96 tim96 is offline
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ok thanks
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