Paul


I have been hearing word of this concept on putting the oil heat exchanger
inside the water heat exchanger for over a year now.  Any thoughts on how or
if it would be practical for a rotary engine that gets 30% of its cooling
from the oil?  My first impression is that it would increase the heat path
flow as the oil has to go to water and then to air.

http://www.amfmotorsports.com/prod/cr1.1.htm


Doug in Japan

Right on Doug we rejected that concept years ago as did Power Sport
that tried it. To quote my cooling book:

"Oil to water heat exchangers
Don't be tempted to use an oil to water heat exchanger for oil cooling.
Several builders have tried this and failed miserably. A fundamental factor
in the process of heat transfer is the difference in the temperature of the
two mediums. The rate of heat transfer in any heat exchanger is proportional
to this temperature difference. In an OIL TO WATER heat exchanger this difference
could be as little as 10 degrees Fahrenheit. Water 220 oil 230 degrees F.
In an OIL TO AIR heat exchanger this difference is usually about 100 degrees
F or more. An OIL TO WATER heat exchanger adds to the water cooling problem
and reduces the margins of safety between normal operation and unstable operation.
(Bulk coolant boiling). An OIL TO AIR heat exchanger oil cooling system on
the other hand is a stable system as oil boils at a temperature well above
normal oil operating temperatures. (Nothing worse in the middle ages than
being boiled in oil.) It is also a parallel independent cooling system
and will continue to function when the liquid cooling system fails giving
additional time to get the aircraft on the ground. This is not the case
when an oil to water heat exchanger is used. In that case all your eggs
are in one basket."

BTW please  see if you can measure the bell housing bolt pattern on
the 16B to see if it is the same as the RX8 and 3rd gen bolt patterns.