What is your opinion on oil coolers air/oil or water/oil. I know art is running a water cooler oil cooler and it works fine my concerns are if you should lose water cooling there goes the whole system water and oil. At least if you have your oil cooling system air cooled you have some cooling of the eng to get you safely on the ground. Also less lines to hook up without the water going to the oil cooler.I have a meeting with my neighbor Waltrip the nascar fellows cheif mech to talk this subject over will be interesting to see what the nasca boys say and use. I can build it either air/oil or water/oil. What are the opinions out there.thank

    Regards

            Ed Klepeis

Ed;

Depending on the installation, there can be some good reasons, and
advantages, to oil-water heat exchangers.  I had taken a serious look at
that.  What I found was that the available oil-water coolers were designed
based on typical piston engines where the oil flow rates are much lower than
in a rotary.  I think Fluidyne has some of the best ones, but coolers sized
for the heat load had oil side pressure drop that was prohibitive for full
flow on the rotary.  So if you are designing an oil-water exchanger, keep
that in mind.

Al