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

One third of the total cooling comes from the oil. The stock 2nd RX7 gen oil cooler
is very effective for its size.

I don't know about a Wheeler express. That is a fairly large cabin. Perry Mick tried
that for awhile on his long easy but he did away with it eventually. I don't know
what his reasoning was. The device is below the cockpit.

Back near the firewall is a tricky place to put the oil cooler from a ducting
standpoint however it has been done before and it worked.

I think it is worth a try if you can duct the exit in such a fashion as to not hurt
the cooling when you don't need the cabin heat. It is best to mount it flat in that
position so there is a 3 or 4 inch long strait section of exit duct after the core.
Any curvature near the core will restrict the flow.

If you send me some dimensions of the hard points on the firewall and a rough out
line I can do a better more accurate 3D. A 3D will save you a year of starting over
two or three times. Typical for people trying to do it the old fashion trial  and
error method.

It is best to use as large a spinner as you can with rotaries as they are basically
round engines.

This is a Wheeler Express with a 3 rotor but I am not sure about how accurate the
dimensions are.

Paul Lamar

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