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Old 06-28-2011, 11:43 PM   #1
njansenv
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S38B36 - low cold compression, 2 cylinders

So... I ran a compression test (cold) on the S38b36. 2 cylinders measure ~90psi compression, the rest are a snappy 180-190.
Ran the motor for a few minutes, rechecked, and the compression was 170 or so.

Before I put the motor in the E30, I could:
1) Hope that the low compression was from sitting, and will get better with some driving (the PO assures me the car ran well when parked)
2) Pull the head now, spend the $500 on a gasket kit.

Anyone know how hard it would be to pull the head once in the car (e30)?
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Old 06-29-2011, 12:14 AM   #2
propr'one
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rings are probably worn. Its normal rings to make a better seal when the engine is warm.
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Old 06-29-2011, 08:34 AM   #3
njansenv
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It just seems strange to me that only 2 cylinders are affected if it's rings.... I was thinking sticking valves and/or headgasket
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1998 328i "M-tech"
2001 TDI Golf. 1300km/tank commuter. Boring, slow, cheap.
1991 P-car: 964c4 Let the porcupine jokes commence.


Gone: '99 M3 vert, '98 M3 sedan, '91 E30, '89 E30, '87 E30, '91 Euro M5, '93 6-speed Corvette, STI v8 swapped '98 Impreza, '73 2002, 2004 325iT
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Old 06-29-2011, 08:51 AM   #4
marek
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If you are going to pull the head, do it before the motor goes in. A bit of a pain in the E34, would suck in an E30.
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