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<< Lancair Builders' Mail List >>
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>>My second question concerns engine oil temperature...cruise the
oil temperature runs in the 190-195 range. The book talks about oil temps
in the 170-185 range at cruise with a red line of 230. My climb temps are
normally in the 200-210 range on hot days with the temp coming back down
shortly after reaching cruise altitude.<<
Its OK. 230 is the redline. 200 during cruise in the summer is
absolutely nothing to worry about. Sure, cooler is better but 180 should be
the minimum to boil off water that condenses after a flight and does your
engine no good.
>> ... leaning. My conversation with the Continental rep at SNF leads me
to believe that I can run the engine (below 75% power) at 100 F lean of
peak for best economy. I was told regular cruise
would be 50 F rich of peak and best power should be 125 F rich of peak.
My local flying buddy "experts" are aghast at the 100 F lean figure and
point out that fuel costs are not much compared to early overhaul costs
caused by the engine not getting the correct fuel.<<
Your buddies don't understand the laws of thermodynamics. At 75% power
or below, it is not possible to damage a non-turbocharged engine with the
mixture control. As lean as you can get with smooth operation is just
fine. It is hard to get an engine to run smoothly that lean (100 degrees),
but with proper fuel/air distribution it will do it. GAMI has a website
you must visit (http://www.gami.com/). They market a set of injectors that
make it possible to run your engine with very smooth output at up to 100
degree lean of peak. The cylinder head temperatures will actually be far
lower than any rich of peak setting. Of course, power output drops too,
but economy is way up.
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LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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