One of the neat things the P38 had was an engine air, inlet
temperature gauge. The pilots were instructed to never allow
the inlet air to exceed 135F out of the intercoolers. This was to 
prevent the engine cylinders from detonating.
Sounds like a very good idea for turbo rotaries.

BTW the intercoolers on the P38's were built into the leading
edges of the outer wing panels. Facinating!
 
Paul Lamar
 
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