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Mike,
About the Positech, where can you find one of these
coolers? Are they an improvement on the one provided
by TCM? What do you think they might cost?
There is one bandaid fix you might try. It seems to
have worked for me. Use 1 1/2 inch scat tubing that
begins 4 inches back from the air inlet and takes
fresh air right to the box in front of the oil cooler.
I attached mine to the intake tubes, just above the
spark plugs.
Art
--- MikeEasley@aol.com wrote:
The TCM #654580 "G" cooler will fit the "N". That
cooler has at least 6 TCM part numbers and has been used for over 20 years on
many different engines including the TSIO-550 which runs fairly cool oil
temperatures from what I understand. I'm sure the reason all Continental
powered Lancairs have an oil door is because the "G" cooler works too well.
That's not true for many of the TCM #654585 "N"
coolers. My oil door is on the shelf. I get 200-205 oil temps in cruise when
my CHT's are around 340-360. Interestingly, my oil temp was right
around 180 for the first 35 hours and then shot up 25 degrees. My guess is a small
internal leak developed that caused some portion of the oil to bypass the cooling
fins. Some coolers leak worse than others, some don't leak at all.
This theory is based on several conversations with
an oil cooler engineer who was reverse engineering the "N" cooler for PMA
approval. He said the way the coolers are assembled left a lot to be desired
and their own design would eliminate the potential weakness.
I know of at least one ES guy who was running high
oil temps and got a replacement cooler from TCM and is running at 180
now. Another ES guy who bought a Positech and is running at 180 now. Another ES
guy has gone through a couple coolers with no improvement. TCM won't
change models of coolers on a warranty, Ron G. is right, they would have to create
a whole new engine model to do that, not going to happen.
Mike Easley
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