i found a direct fit fan switch that will go in the choke sensor thread just below the thermostat it opens at 203f and closes at 194f i have a manual override switch should i need the fan to stay on longer ..... thoughts?
Mark

 

dont blame the part. instead, wack the installer in the head with a BFH.

 

I've had 2 that were just warranty issues. one the seal on the spring that triggers teh sensor failed from the radiator heat melting the glue. The other one failed from god knows what. It would sometimes work perfectly and come on at 180*, then it started just turning on and off with the ignition...

I completely agree. From my understanding as everything heats up as well rotaries tend to lose compression with the swelling of the engine. That's why low compression engines will start right up cold, but have hot start issues.

 

Adjustible fan control +1. I just ordered one from Summit with my electrical fan. Your oil only reaches its rated viscosity at 212 degrees. I would get a good oil temperature gauge and adjust what oil you use and your water temperature until you can get a consistant reading of 212 degrees on your oil plus or minus 10 degrees.

 

That's absurd advise... rotaries DO NOT like to run that hot. You must be new to this game. A correctly set up rotary will normally have the oil just cooler than the water temps. Right around 220* water temps things start breaking. Mazda recmoends immediate shut down at water temps of 220*... If youre oil is at 212 youre water is likely to be just above that. I like my oil temps at a safe 160* and water temps below 180*

 

No, it is oil manufacturers advice and I am not new to this game. I do not claim to be an oil engineer, but I go off what I read in technical manuals and the properties of oil do not change between a piston and a rotor.

If you want the rated viscosity of your oil, you run your oil at 212 degrees. If you want something else, do something else...

 

What you have to remember is that a rotary rejects such a large proportion of its heat through the oil. That occurs mostly because the insides of the rotors are bathed in oil. When the oil runs hot, it's more likely to allow hot spots to form on the rotors, which can cause detonation.

Soo -- even though the oil might be comfortable at 212, your engine probably won't be -- especially if it's boosted.