Is it Ok that hard carbon is on top of pistons?
07-13-2004, 03:13 PM
#1
Drifting
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Is it Ok that hard carbon is on top of pistons?
I am doing my head gasket and noticed that some of the pistons have a black hard crusty surface on the top. I am assuming this is carbon. Is this good/bad? I imagine it probably affects compression ratio.
John
John
07-13-2004, 03:54 PM
#2
Burning Brakes
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Could cause pre-ignition, if there is quite a bit of build up.
What you can do is take a plastique scaper, and take as much off as you can, then suck out the carbon.
Just an idea.
What you can do is take a plastique scaper, and take as much off as you can, then suck out the carbon.
Just an idea.
07-13-2004, 04:18 PM
#4
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I think it is normal. I saw BMW engines with under 30K miles, their piston heads were all black and burned (not literally burned). Calculate at LEAST 10+years of running, older deigns blah blah blah. But i would suggest cleaning them.
07-13-2004, 04:19 PM
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I forgot to mention, there are these fuel additive brands that actually clean up the combustion chamber using chemicals and crap. That could belp!
07-14-2004, 01:30 PM
#7
These pistons are from my 911 engine rebuild, but you get the idea....
Getting 130K miles of hard carbon out of the ring grooves was a nasty job, but they finished up nicely.
