Pressure-side oil cooler?

Describe how would you hook it up to the pressure side?

Plus it's better to have the cooler oil going into the pump / engine

The pressure side goes directly into the engine. How would you break into that side: would you be modifying the oil pump to add a port on the pressure side? Any of that would surely not be Rotax approved and would void any warranty.

Sorry if I wasn't clear. There are adapters that fit under the oil filter and have the thermostat and fittings for the oil cooler hoses. Like this:

https://setrabusa.com/products/susa-billet-sandwich-oil-filter-adapter-for-brz-fr-s-86-180%C2%BAf-t-stat-1 

Hi Paul,

As mentioned above - the Rotax oil circulation system does not lend itself to installing the oil cooler on the pressure side of the pump.

The objective in having an oil cooler is to reduced the temperature of the oil, so that it retains its qualities, the engine temperature is kept within specification and less oil is needed to do the work of a greater quantity, thus minimising weight & dimensions.

An oil cooler can function anywhere in the oil circuit. Due to the peculiarities of the Rotax oil circulation system, its logical location will be on the suction/return side of the system (as described in the Instalation Manual).

What you propose - common aftermarket addition to ground based vehicle systems, using an integrated oil sump, would only add unnecessary complexity & weight to the engine, for no gain/improvement in efficiency.

 "I think it is a far neater installation with fewer hose connections ..".

The existing, very simple, system utilises the existing oil return line (2 connections), which I doubt that you can delete. So you would be adding at least two more lines and if my imagination is correct, a total of 3 additional connections & more weight. 

Rotax does not supply an oil thermostat. The use of this device is up to the aircraft builder/owner. In general, is only warranted in very cold climates.😈

Hi Paul,

The answer should be don't do it. Leave the system as designed and tested for the last three decades. This could end up as a total in flight failure not to mention having to replace a $24K engine.

Better to be safe than sorry in this case.