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The Terminator
Engine/Tuning
Looking for opinions on piston ring gap
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<blockquote data-quote="SlowSVT" data-source="post: 14879203" data-attributes="member: 20202"><p>Malcolm</p><p></p><p> I am no expert on piston ring design but this one has me scratching my head. </p><p></p><p>The rings rely on the sudden combustion pressure which forces the ring to the bottom of the land where the gas pressure can get behind the ring and force it to seal against the cylinder wall. Put the gapless ring on top and the lower 1 piece ring below it won't get as much blow-by pressure to seal it. Having two .75 mm rings stacked on top of one another won't be as robust or transfer heat to the cylinder wall as well as a 1.5 mm one piece ring under the punishment of a supercharger. I don't ever recall anyone (including Total Seal) advocating running a gapless ring in the top slot in a supercharged engine. Take two oil control rings that sandwich the wavy separator thingy and you pretty much got a 1.5mm gapless ring and this tech thinks that should take the brunt of the combustion protecting the fat 1 piece ring below it.</p></blockquote><p></p>
[QUOTE="SlowSVT, post: 14879203, member: 20202"] Malcolm I am no expert on piston ring design but this one has me scratching my head. The rings rely on the sudden combustion pressure which forces the ring to the bottom of the land where the gas pressure can get behind the ring and force it to seal against the cylinder wall. Put the gapless ring on top and the lower 1 piece ring below it won't get as much blow-by pressure to seal it. Having two .75 mm rings stacked on top of one another won't be as robust or transfer heat to the cylinder wall as well as a 1.5 mm one piece ring under the punishment of a supercharger. I don't ever recall anyone (including Total Seal) advocating running a gapless ring in the top slot in a supercharged engine. Take two oil control rings that sandwich the wavy separator thingy and you pretty much got a 1.5mm gapless ring and this tech thinks that should take the brunt of the combustion protecting the fat 1 piece ring below it. [/QUOTE]
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Looking for opinions on piston ring gap
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