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With
respect to the question about oil type and oil temperature at take off, for what
it's worth (very little), I use straight 50W in the LyCon-massaged IO-550
in my Legacy at LyCon's recommendation, and I always get the oil temperature
over 80 deg F before run up and over 100 deg F before take off. In my
climate (Orcas Island, WA), the straight 50W works well year
round.
Carl
Lewis
Legacy
L2K-203
N14CL
"What is a
decent oil temperature for take off. The viscosity changes by roughly 2
orders of magnitude between start up and steady state cruise. Is there
some viscosity/temperature threshold that should be observed to prevent damage
at take off power? Also, is there a particular reason for not mixing
brands/viscosity? I tend to run multi weight in the winter and straight
weight the rest of the year(same brand). There is obviously be some
mixing during the change over. Chris Zavatson"
Decent oil
temp for take off? Chris, I think it is important on this site to say "I don't
know" when it is so. Here's what I do know. In our IMSA road race car we ran
50W oil for a while. We wanted the oil temp at 150 deg F on the pace lap.
This was impossible on cool days. The concern is two-fold. One, oil to the
valve train and two, oil to the connecting rods at high (8500) RPM. The other
concern is actually blowing up the oil filter if oil pressure gets too high.
I've seen this happen. This obviously would be very bad on take off. I would
think that over 100 deg F should be OK with 50W oil, but I don't know for
sure. The reason I don't mix oil brands is due to its negative affect on oil
consumption. Changing from straight 50W to 20W50 is not nearly as big of
a concern, in my opinion. However my experience says you will get better oil
consumption while running the 50W oil as well as better lubrication and
therefore less engine wear. You know, I used to get in a big hurry during
run-up, I'm not sure why, just seemed like I should get the engine back to
idle. Now I do the run-up lean and let the engine warm up a little...no big
hurry. I know the question was, when do you pull the throttle back and request
clearance for departure...hope this helps.
Craig
Berland
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