I have a  question regarding the stock Mazda oil cooler and cabin heat-

Can I get  enough heat from the oil cooler to duct some into the cabin for
passengers  and defog/ defrost? I have room at the back of the engine
compartment to  mount the oil cooler, and I have the metal adjustable ducts
from my viking  where the muffler heat came in. I have a heater core and was
going to mount  it behind the panel, but this seems to be simpler if I can
get enough heat  from it.

With the metal duct pieces, I can regulate the heat with a  cable, or I can
use the servo motors that came with the RX8 heater core  assembly. Either
way, simple is better.

Kevin  Alderman

While the idea will work, and enough heat will be available, you could
think about what a leaking heat exchanger might produce. Thick white smoke that
 is flammable when cool, and explosive when hot. The smoke supply will last
until  the oil is gone. A similar leak with coolant will produce a similar
smoke  cloud that will make you very uncomfortable, but probably not kill
you  right off. Plus most of the problem will subside  when coolant pressure
drops to zero. And the engine will carry on at low power settings for a
long time even with no coolant. Having suffered both oil fires and coolant
leaks, I would sign up for coolant leaks every time. Should coolant temps run
away you can turn on the coolant filled heater and fan units full blast and
knock down those temps. Not fun at all but it works.

Lynn E. Hanover



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