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A most thought-provoking article David, both the booster and coatings portions!
Re inlet valve temperatures, somehow it never occurred to me that in normal operation they could get so hot, despite having experienced inlets tulliped by detonation, with the mating faces 're-forged' by the head seats to maintain a 45° angle.
An IR pyrometer should be a most useful tool in an engine where the valves are visible to an observer. Face coating Vs. face and underhead, different coatings, etc...
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