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Old 04-26-2009, 06:21 AM   #1
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Default How To Clean Carbon Deposits On The Piston Head?

My V-spec piston was squeaky clean after break-in process, then I did the after run routine on the next gallon, the piston starting to get blackened by carbon deposits, is this normal? Or it's should be clean? How to clean this? I run my vspec average on 70-90 degrees celcius. Thanks.
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Old 04-26-2009, 07:57 AM   #2
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My V-spec piston was squeaky clean after break-in process, then I did the after run routine on the next gallon, the piston starting to get blackened by carbon deposits, is this normal? Or it's should be clean? How to clean this? I run my vspec average on 70-90 degrees celcius. Thanks.
A little carbon build up is normal. A lot of carbon is signs of poor fuel. Carbon will clean off with after run oil.
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Old 04-26-2009, 08:18 AM   #3
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for the stubborn stuff i use automotive carb cleaner sprayed into a rag and rub it off, seem's to have worked for me so far....
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Old 04-26-2009, 09:02 AM   #4
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i use Tamiya Polishing Compound to remove such, seems perfect for me, but remember just the top part, not the surface of the cylinder.
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Old 04-26-2009, 11:20 AM   #5
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I've seen some mechanics uses metal polish to clean the piston and wondering if that will reduce the compression of the engine since that is abrasive...
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Old 04-26-2009, 11:42 AM   #6
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You can clean the top of the piston & head button ONLY. IMO, I don't bother with the cleaning. Carbon will always show up on a race tuned engine. It does nothing to the engine at all. You'll actually find that if you keep cleaning that motor, it will not run or perform well in the long run. Inspection of rod bushing and bearings is about the only thing needed.
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Old 04-26-2009, 12:01 PM   #7
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I've seen some mechanics uses metal polish to clean the piston and wondering if that will reduce the compression of the engine since that is abrasive...
I use metal polish.

Clean and polish only the top of piston head and button head.... and leave the side alone. I also use dremel with soft tip ( cloth tip ) to polish it.

Don't forget to clean spray and re-oil the piston unit and button head before putting them back in into engine.
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Old 04-26-2009, 12:09 PM   #8
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But don't you think that carbon build up will eventually slippin' into the sleeve and make some scratches? Or it will messed the combustion chamber?
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Old 04-26-2009, 12:45 PM   #9
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But don't you think that carbon build up will eventually slippin' into the sleeve and make some scratches? Or it will messed the combustion chamber?
Carbon build up on the piston ring, is good thing, it is acting like a piston seal. It wont scracth the sleeve liner.

Carbon build up on top of piston and underneath the button head, they are not good. In severe conditions, the build up could cause pre-detonations, thus increasing the engine temperature.
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Old 04-26-2009, 02:13 PM   #10
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Carbon build up on the piston ring, is good thing, it is acting like a piston seal. It wont scracth the sleeve liner.

Carbon build up on top of piston and underneath the button head, they are not good. In severe conditions, the build up could cause pre-detonations, thus increasing the engine temperature.
I find high milage engines have lots of top carbon. If you clean this off completely, the will run differently. I just remove heavy or thick pieces, but in a fully race tuned motor, this will just not be there. Only engines that are worn out will start to build up excessively.
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