George Lendich wrote:

Paul,
I don't know if you have heard of this one before, but I'd thought I'd run it by you for comments
by the group.
It was put to me that the 83-85 RX7s have a oil to coolant system that works very well and that a
small radiator within the sump circulating coolant (from the main radiator)  would be far better
than the conventional air /oil cooler. One advantage is that it would remove the need for external
oil lines. Another advantage is that it would act as oil de-foamer as the oil passes through the
radiator.
It was suggested to me that although air to coolant is not very efficient, coolant to oil is very
efficient.
My concern was how much it heated the coolant and how big the radiator had to be to compensate.

Your comments please !
George (down under)

First of all there is a difference of opinion of how well it worked in the cars
and of course the average HP generated by a car engine is way less than
than an aircraft engine. Take one out to the outback and run it flat out 
at top speed for an hour or so and check the oil temp :) Notice that 
Mazda no longer uses it in their rotary powered cars. 

An oil to air heat exchanger is a back up parallel cooling system
so to speak and it doesn't have the same boiling temp cap that a
glycol/water cooling system has. Oil boils at a much higher temp.
There for it is a more stable cooling system.

Paul Lamar
 
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