I've been having.Hi all, just thought I'd finally drop a line to all on the fun and games
concerned, and as we are both running very similar setups, 0-320's withI have had similar problems to Walter as far as oil temps are
150hp conical mnts. and Bobp's beloved speed cowl. I am still running the
warp drive prop with a dampner. I've watched carefully along with trying
stuff of my own, so here goes.
Opening the bottom of the cowl up and cleaning up the exit around theWhen on the wheels the oil temp was not a concern, cht's were.
firewall flange, adding a 1" lip to the front/ bottom of the opening,and a
learning curve on the readings you want from a thermocouple under the
sparkplug cured that.(See the archives for those details.
to the oil temps. It actually was kind of a slow increase, not a " you didOnce I began the float flying, I began to have to pay close attention
this and this happened" sort of thing. I really noticed it last year on the
way to and back from the big "OSH" last year, and it was evident on the
long climb for altitude over the big water. It was a very hot time last
year, and I figured that had an impact. Now this year. Most of my flying is
vey short hops, lake to lake for sunset, stopping to harrass friends and
the like. Lake ops were fine. I began to notice if I cruised at 2450rpm for
more than 1/2 hr the temps would begin to rise. Were talking in the 215f
range, and even with slowing rpm's and running the mix fat it would not
cool. A couple of times i streched my stops to allow for some cooling
before I departed. Doing multiple tkof's and landings didn't seem to cause
the temp to rise as much but it would rise.
bilge blower that they were using to try and move heat up to ther toes.So I went and tried somthing different. My longeze buddies have found a
Nice 3" dia and explosion proof. I took me about 45 min to adapt it to my
setup. The result was I had no problems with short hops and on the lake it
was never above the 190f it had been on the wheels. So I took it for a nice
long ride of about 1.5hr with a long climb. The result? The long climb
temps were worse! Now do give me a little credit, I had some suspisions
that the fan blades and motor could block the tube, but what the heck it is
and experimental.
noticed that I really got alot of air bleeding by the shroud to coolerNow during the installation I had fired up the fan on the ground and I
space and I had siliconed the gaps shut then, stopping the blow by. I
really didn't think it was that much but it was to much none the less.
forgetting to keep it simple). Maybe a shroud to get the airflow closer toSo with those results the creative juices began to go(read I was
the cowl outlet. Maybe with a cowl flap! Maybe I need to open the cowl
more. and so on. Enough of the long winded speach.
tube. And I took some advice and pulled the vernotherm for checking. SeemsI removed the blower. I found a little better routing for the scat
the eze's have been having the same oil temp problems on long climbs and
found that to be a culprit. Well I did find some carbon junk around the
vernotherm and some signs of it not seating properly, so I cleaned it very
well and reinstalled it, figuring I'd get the right poop on dimensions if
the problem persisted. I am not running an oil filter YET, but I will be
soon although I now feel one should remove the vernotherm and clean it
with the oil change too.
first flight had the temps at 175f! Barley a budge on a 1/2 hr climb!Results? well, the air temps have been cooler here,75f or so, but my
Almost to cool! I think I'm looking forward to a much warmer day to give it
a try! That will probably be on the way to OSH again!
all holes and gaps around the shroud to cooler. Make sure your vernothermTheory? Keep the scat tube arch as clean and smooth as possible. Close
is operating correctly and completly. KEEP IT SIMPLE!
kit. Hope this was fun reading, KEEP AT It,it is worth it! Curt N97MRWell that's my disortation for now. Next time it will be on the STOL
Hi Curt
I had similar problems with my oil temps until one of the local mechanics
told me about the experiments they'd done on a pitts special. The only oil
cooler location that worked for them was to mount directly to the rear
baffle. I mounted my undersized antique brass cooler from a ? in the same
place and ended up with acceptable temps while on wheels. I also wrapped my
exhaust with ceramic header tape which also lowered my oil temp. When I
mounted my plane on floats I changed the oil cooler to a proper sized one
and now even on the hottest days of the year the highest I've seen is 185
degrees.
I have an oil filter installed in line with the oil cooler. Just go to
your local VW specialty shop and get an oil filter bracket for a bug. The
filter holds almost a litre of oil so the increased capacity will help too.
Drew Dalgleish
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