This engine and the flyrotary group continues to teach stuff I never thought I needed to know.

Wish I’d bought a better cooler years ago rather than mucking around with the ones I had, ah well, knowledge is gained.

I very much agree with high flow rates in the coolant, I have no thermostat and no restriction other than the radiator core, if it cools too much a cowl flap will fix that. All coolant pump flow circulates through engine and cooler in one loop so faster pump means more flow through engine for higher heat dissipation.

On the oil, it was my understanding it works a bit differently, oil can flow through multiple paths, oil flow rate through the rotors/engine is farly constant from just above idle through to red line. Pump flow increases expotentially with rpm but the excess flow is dumped by the OCV back to sump. Also back to sump through front cover relief valve, thus not being cooled, like in a poorly setup system like mine. Does not matter how efficient the cooler is if it cannot get enough oil to go through it. This has been my problem in getting oil flow capacity from cooler manufactures.

A pressure sensor before the cooler could have saved me wasted years.

The front cover relief valve is just that, The systems safety valve, without it there is possibility in a blocked system pressure building to levels that blow hoses/ coolers etc, better to have an annoying over temperature issue to diagnose.