The inserts look like stainless steel or Inconel.
Jim Mederer tells me the exhaust runs on the average 150 degrees F
cooler as he has an RX8 engine on the dyno already.

Paul Lamar

Paul why do they use the inserts?
Royce

Good question. My guess is the exhaust would erode cast iron.

Paul Lamar

It doesn't in a piston engine with aluminum or cast iron, realizing the
temp is some lower, but then again the the combustion temps would be the
same.
Royce

A lot of the exhaust heat in a piston engine is absorbed by the exhaust valve.

Paul Lamar
 
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