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Ceramic coating combustion chamber + piston on higher compression = predetonation

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Ceramic coating combustion chamber + piston on higher compression = predetonation

Old 02-20-2019, 01:02 PM
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Location: Watertown, Mass
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Ceramic coating combustion chamber + piston on higher compression = predetonation

So I am looking to get my combustion chambers and piston tops coated in ceramic thermal barrier coating. I have searched a lot of fourms and have found people have these areas coated with no predetonation issues on heavily built motors but there is always someone warning that predetonation can be an issue. I am a little worried about causing predetonation by doing this on my LT1. The motor has been at the machinist for 4.5 years (that is another story) and what I am having done is 4.040 bore on a 3.75 stroke forged crank, -4cc pistons Mahle pistons (with no top piston coating) 58cc LE3 lt1 heads, cam im thinking 232/236 .580/.580 on at 110 lobe separation with 106 ICL. Compression works out to be 12:1 to 12:3 (depending on head gasket thickness). So the coating will reflect some heat back into the chamber rather than the piston and head. Will that reflected heat cause predetonation with my compression ratio plus the nature of advance timing of a LT1? Or am I being overly worrisome?
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Old 03-06-2019, 02:48 PM
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Re: Ceramic coating combustion chamber + piston on higher compression = predetonation

I am trying to keep the dynamic compression to 9.5:1 or lower but that is not easy with these flat top pistons of Mahle SBC125040T04. I might have to open up the combustion chamber to get a few cc's. I might put a coating on the bottom of intake manifold, manifold runners, inside intake manifold, intake and exhaust cylinder head runners, inside headers, and valves. Thus leaving the combustion chamber and piston un-coated.
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