Walter Williams wrote:

i have been trying to decide what apex seals to order.  the idea of a single
piece seal appeals to me.  it appears that the seal clearance would get
larger as the engine got hotter.  wouldnt the 2mm seal cool alittle better?
would tougher material solve the detonation problem.  i am going to turbo
charge but only a small amount.  thanks walt.

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I also like the one piece idea as Mazda says there is little leakage difference
at 5000 RPM and above.

Good question on the cooling of the seals. Perhaps they would.
Part of the reason they get so hot is they let the exhaust gas out of
the peripheral port. Thinner should get hot faster and maybe hotter.
They should also cool off faster when encountering the two cycle cooling oil.
I have not seen a study on that from Mazda or anybody else for 
that matter.

I think the 3 mm Hurley seals are tougher than the 2 mm cast iron stock seals.
Hurley says they are softer so that should make them tougher.

Paul Lamar
 
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