Our problem was that we were hitting 150 deg CHT after only a couple or three
minutes at full power; we had to drop to 4000 rpm to keep it below the limit. It
turns out that I didn't read the engine manual correctly. I read somewhere that
100 % glycol was prefered, to raise the boiling point and avoid vapour forming
at hot spots, reducing conductivity and so on. Then I studied the latest manual
which says use 80 % glycol/water.
I'm still puzzled by the low coolant temps and high CHT, unless it is simply the
poor conductivity (and high viscocity) of glycol.
Graham
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