Carbon pistons?.

[Greg Hermann]

>On Fri, 22 Jan 1999, Bruce Plecan wrote:
>
>> Key word would normally be Carbon Fiber, what messes that up is
>> licensed by NASA.
>>
>> >Anyone have any idea what a set of these things would cost?
>> >:P
>> >Ben
>
>An interesting patent is 4683809, available from IBM {pictures, text as a
>graphic] and the PTO [text in ascII]
>
>a carbon-carbon piston does not need rings because of negligable [1/40 of
>Al] heat expansion.

Is this in the patent--(no rings)--it sounds as though, with expansion this
low, it would expand less than the bore, and thus get looser when warmed
up, thus giving pretty spectacular blow-by if no rings???

Regards, Greg
>
>
>4546669 covers a fiber-reinforced synthetic con rod.