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More useful than a low temp coolant thermostat, but not really worth the price if you're using anything thicker than 5w-20 IMO. The oil cooling is actually pretty solid on the Rx8, the misstep was putting the coolers on the corners rather than on the radiator stack or using an oil to water cooler.
Calculate oil flow per tube. Usually an unknown, the oil flow through the engine can only be measured using a flow meter. (Example: 29 litres/min through 16 row cooler → 29 / 16 = 1.8 litre/ min ) Calculate etd (extreme temperature difference). (Example: oil in to cooler at 120° C - Ambient at 25° C \ 120 - 25 = 95). State matrix air velocity.
Mocal oil thermostats are designed to regulate oil flow through cooling devices until optimal (minimum) temperatures are reached. Cold oil enters the thermostat and is bypassed through the center of the unit returning to engine (figure 1).
RP offers this Oil Cooler Thermostat to lower oil temperature in you RX-8 Renesis rotary engine! Easy upgrade is easy to install. 5-22-24 Back in stock and ready to ship!!!
It is therefore desirable to control of the oil flow through the cooler by a thermostatic device, we call an oilstat, set to divert oil to the cooler at 80°C (although a wide range of settings is available for special applications).
The thermostat works just like the one in your engines water system, only that it restricts the amount of cold oil that goes to the cooler until it reaches its set opening temperature. When the oil reaches 80°C, it will begin to open the thermostat and the oil can then flow freely to the oil cooler.
The best one I'm seeing look to be the RRP version that maintains a Banjo bolt on the cooler side and JIC on the other. If you're into modding and you'll already be down there, the real best option would be to upgrade your cooling and install an oil to water cooler.
