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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