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I suspect that you are correct, Al. The
operating temperatures recommended my Mazda long ago are undoubtedly
conservative especially with regard to the capability of various "O" rings to
withstand the heat.
From what I understand, the oil temp limit of 210 F into
the engine is there to protect the rotor bearings, which is supposed to be
the first thing to go at higher temps.
I've never heard of 180 F as a water temp limit, other than the
fact that the stock thermostat is 180 for most models. I can't recall
what the thermostat was on the FD, but I practically defy anyone to get an
FD to run under 200. I don't think the radiator fans even bother to
come on until 205 F or so. Can't quite
recall.
Now Lynn and the racing boys have said that best power comes (from
memory) with water under 180 F, and oil under 160 F. These might make good
targets for cruise, but I don't think too many people are going to have the
cooling capacity to see these in max climb
mode.
Cheers,
Rusty (just full of opinions
today)
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