Lots of (most?) modern automotive radiators have plastic tanks (on the
ends of the core).  There ARE plastics that will survive the temps and
pressures...


Matt-

Yes but they are troublesome. It is automotive practice to use
a 15 psi radiator cap but most rotary powered aircraft are now using 30 psi caps.
I see no advantage in plastic over aluminum for aircraft use.

My local BMW expert says for reliability purposes replace the plastice
radiators every two years.  I had two fail in a six year period.

Hans



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