What type of pistons are the L33?
Thread Starter
Teching In
Joined: Oct 2022
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What type of pistons are the L33? I'm currently gappings rings for boost, I'm using a summit racing ring set.
It states for the top ring, the gap must be:
bore x .006 for cast pistons (0.023)
and
bore x .0085 for hypereutectic pistons (0.032)
I then looked up piston material for an L33, the internet seems to state that the 4.8/L33 flat tops are "Hypereutectic Cast Aluminum Alloy" so now I'm confused?
Should I be gapping for cast, or gapping for hypereutectic?
It states for the top ring, the gap must be:
bore x .006 for cast pistons (0.023)
and
bore x .0085 for hypereutectic pistons (0.032)
I then looked up piston material for an L33, the internet seems to state that the 4.8/L33 flat tops are "Hypereutectic Cast Aluminum Alloy" so now I'm confused?
Should I be gapping for cast, or gapping for hypereutectic?
TECH Addict
Joined: Dec 2017
Posts: 2,190
Likes: 976
"Hypereutectic" refers to the metallurgy of the material they are cast from. "Eutectic" is the ratio of the various ingredients, that results in the lowest possible melting point for any concentrations of those constituents. "Hypereutectic" means the alloy has more of the constituent that has the higher melting point than a eutectic alloy. So, they're cast; but the alloy they are cast from, is hypereutectic in nature. In this case the material that is "more", is silicon (the "less" being aluminum).
Use the hypereutectic instruction since they're cast from an alloy having that property.
Use the hypereutectic instruction since they're cast from an alloy having that property.
