It’s interesting that Tracy’s book “Aviators Guide to Mazda Rotary Comversion” on page 85/86, ‘oil cooling’, (best references I have found yet on such) Tracy states “The best choice of oil coolers is probably a stock Mazda oil cooler”. He then elaborates,
saying only ‘low restriction’ coolers be used because the rotary has a higher oil flow rate thru the rotors.
I recall Mazda oil coolers incorporate an internal design that other coolers don’t usually have.
I don’t know if there have been any updates to this thinking, but there you go.
Of course, you would want to have any cooler professionally cleaned before reusing it, methinks.
Marc
Sent from my iPhone
On Oct 24, 2025, at 6:46 PM, Marc de Piolenc piolenc@archivale.com <flyrotary@lancaironline.net> wrote:
Oil and water are the two media by which the ENGINE is cooled. Improving one (the oil) is going to relieve the other of some of its cooling load, lowering its temperature.
On 10/24/2025 6:00 PM, Rotary motors in aircraft wrote:
An unintended
consequence of the lower oil temps, is that I noticed that my water
temps also dropped by about 10 degrees. In the past when cruising
around the temps would settle between 145 and 165 degrees, while today
it was between 130 and 135 degrees! So is there a thermo dynamic reason
why lowering oil temps would also pull down the water side as well