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Old 10-05-2012, 02:40 AM   #31
Hicks OP
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Quote:
Originally Posted by maigashi View Post
Without knowing too much specifically of the gs motor, I am very familiar with BMW engines and it is not uncommon for the pistons to be the first to go and the cylinders and rest of the engine to look fine. Unlike most other engine the cylinder walls in BMW's are nikasil coated or treated. The makes them the metal equivalent to diamond. Pistons wear and the cylinder remains. Nice in a lot of ways since you don't have to overbite when you rebuild. New piston, new rings and a go. It is a little odd for the pistons to wear but something has to give no its not the wall, then.......
Good luck. Pictures would be great :)
thx for the valuable info ;) it quite a correspond what they told me in the service :)
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Old 10-05-2012, 03:27 AM   #32
LukasM
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Nikasil plated cylinders can wear as well, so you should still get the cylinders checked with a bore gauge for taper and out-of-round.
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Old 10-06-2012, 11:52 AM   #33
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Originally Posted by LukasM View Post
Nikasil plated cylinders can wear as well, so you should still get the cylinders checked with a bore gauge for taper and out-of-round.
I had.

after 135 they are in tolerance (=VERY round :).
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Old 10-06-2012, 12:01 PM   #34
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my piston on the left.

The darker body means that it's teflon-coated, they say.



carbon + my sexy hand
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Old 10-06-2012, 01:30 PM   #35
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There are a few pistons like that are out there, you get any insight about about yours. You aren't one of those, it runs fine on regular guys are you? Any modifications you don't want to tell us?
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Old 10-06-2012, 01:41 PM   #36
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There are a few pistons like that are out there, you get any insight about about yours. You aren't one of those, it runs fine on regular guys are you? Any modifications you don't want to tell us?
you mean that it looks too good for such kms?
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Old 10-06-2012, 04:35 PM   #37
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The gunk ( Carbon ) on the top is normal, due to all the different additives in modern gas. You do however have quite a lot of blow by. ( rings not holding back the pressure) Which is then caking the oil channel in the lube ring...which then further decimates the lube process. This much blow by would have been visible in the exhaust, I would think. Did you notice any " abnormal engine behavior"....or did you just decide to tear into the motor for the fun of it....????
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