Carbon pistons?.

[Dave Williams]

-> a carbon-carbon piston does not need rings because of negligable
-> [1/40 of Al] heat expansion.

 Sure.  Same with a properly designed and fitted cast iron piston.
However, the tapered skirt at the bottom and rings on the top
dramatically reduce cylinder wall friction.

==dave.williams at chaos.lrk.ar.us======================================
I've got a secret / I've been hiding / under my skin / | Who are you?
my heart is human / my blood is boiling / my brain IBM |   who, who?
=================================== http://home1.gte.net/42/index.htm