Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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 Posted: Sun May 20, 2007 9:09 pm Post subject: [Fwd: Oil Cooling Update] |
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Scott,
I'm glad that you're doing better with those temps now! Don't
feel too bad about not believing at first that it would help...I
would have adamantly argued that I had everything perfect when I
looked at mine too. There are still a couple things that have
really humbled me....one was quoting speeds when I hadn't actually
done an accurate and repeatable speed test to make sure that
my speeds were what I said they were. It's embarrassing to know
that I was off by almost 8kts. Then came the CHT's. I could ahve
sworn that my baffling was fantastic. Looking at it, it looked
really good. But, finding that thread on the air ramp as a
leakage spot was a real winner. That one thing along I think
dropped quite a bit of heat. The cylinder filing on those
fins I think is a great thing too. In the end, I am sure I
dropped mine probably an effective 20-35 degrees just from some
of the things I did. Made me feel like quite a heel for missing
them in the first place. I haven't yet totally removed my
front plates from in front of #1 and #2, but they're a ton
smaller than original, and I know for sure that it helped a lot.
As for current temps, I run hotter when running ROP, and Saturday
I did an X/C trip where I ran LOP one way and ROP the other.
The LOP part I had really low temps, but when doing the ROP
run I tried to warm it up. It was a warm day besides.
I climbed in the 95kt range, with lots of power, just to see
how hot I could get the cylinders. I managed 409F on my
hottest, after about 4-5,000' of climbing. Then I dropped the
nose to a more normal 115kts and my temps dropped pretty
rapidly under 400. Once I leveled out in ROP cruise, my
hottest cylinder was 375, with 2 cylinders being in the
360-375 range, and 2 real close to 350, and 2 that were
I think in the 340 range. Very comfortable that way, and it
was a warm day. Oil temps were under 180 on one leg, and
about 185 on the other. Even in that climb the oil temps
stayed right around 195-205.
Running LOP the cylinders really run much cooler. I'd bet
maybe 30-50F less. This year I plan to take the time to
actually use my EGView software from EGTrends and use their
GAMI tool to get my injectors better matched. The engine runs
nice, but I could do better, and Bart will swap injectors,
so it's worth the effort.
To all, before you go trying all the band-aids for heat
problems, do take the time to really look at your baffling
and all of the possibilities. It's OK to find out you
missed something, and what counts is that you took the time
to really explore it. There really should be no RV-10
flying that cannot have reasonable temps without lots of
mods. There are still some who may wish to do more, depending
on where they live, but there is nothing inherently
unacceptable with the cooling design. Yeah, it can probably
be improved in a few ways, for those who want to, but
by doing a good job you'll be rewarded with good results.
Tim Olson - RV-10 N104CD - Flying
do not archive
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