Your likely to get some expert responses, but in the meantime.... FWIW: The ideal oil temp is 180 degrees according to my factory type experts. I flew Pawnees with 235 Lycomings at 240 degrees clean to 3000 hours with no failures or ill effects of any kind. TBO was 2000. Aeroshell 100.
As to climb mode... DO NOT pull the throttle back. There is a fuel enrichment valve/circuit that is regulated by WOT. Wide Open Throttle allows this excess fuel to cool the engine, i.e. exhaust valves. Pulling the throttle back does NOT lug the engine. Reducing throttle reduces horsepower. All other things being equal, it also reduces the fire and heat in the engine. High angles of attack or props that are pitched for more cruise will lug more. Nothing wrong with a 48" pitch.... especially if that is all that is legal. At 2500 RPM. something close to 103 mph should occur near sea level. At 7000 or 8000 feet, WOT may only yield 55-65% hp, so your OK there too. The folks doing STC's usually know what they are doing. Fly it and enjoy. Bob U. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Doug Davis wrote: > > One thing I forgot to add: We need to keep the oil temps. down too, and > taking too big a "bite" will do the opposite. Oil temps. should be in the 100 > degree area, something that seems to elude most of us, but temps. much over > that on a consistent basis short lives the engine. There have been many > articles about this just recently, and they all seem to agree. I also feel > "vindicated" for my stand that performance should be based on "red line" > rather than the old approach of "back off the power once airborne". Backing > off on rpm's through climb lugs the engine, causes oil temps. to rise > abnormally, and doesn't provide enough cooling to the rear cylinders. So > we're back to props, and I'm still confused. > Doug
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