"Louis L. Perley III" wrote:
On ground running the engines. I thought that as long as you ran them on the
ground long enough to get them up to operating temperature then it wasn't a
problem? Something about getting the oil hot enough to evaporate the water
or something. Is this just simply incorrect information?
Fifteen years ago, that was conventional wisdom. Now, you'll get lots of argument
about it.
As for getting the oil hot enough to evaporate water, on my Lycoming O-320, getting
into the green arc won't do the trick. You need to get the temp at least half way up
the scale and keep it there for 15 minutes or more. I can tape over my oil cooler and
manage to get it there on the ground in July or August, but the rest of the year,
ground operation won't get the engine hot enough.
Further, running the engine at all puts acids into the oil from a combination of
blowby and condensation. Unless you immediately change the oil, that acid is going to
sit in your engine. Of course, if you don't run it much (as you didn't), you won't
get much acid buildup, but it's still a problem. It's really best to just pickle the
engine if it's going to sit.
George Patterson
If a man gets into a fight 3,000 miles away from home, he *had* to have
been looking for it.
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