<< If hot water is removed from
 the back of the engine there is less hot water going to the cool side to
 warm it up.
 >>
Paul,

I have a hard time believing that we have to WARM any part of that engine
with coolant.  If that were true, we could tap off ALL the coolant at the
rear rotor and the engine would run cooler.  Something doesn't compute (in my
brain).

Bob Darrah

Checking the coef expansion of aluminum and calculating a 100 degree difference
in the expansion of the rotor housing from one side to the other.
aluminum is about .0000094 inches per inch per degree F. So one rotor housing
would be about 3 thou wider on one side of the engine than the other.
Six thou for both rotor housing not including the iron.
The rotor will cock in the housing and the clearances in the main bearings 
will change. The data is shown for 3000 RPM and I assume that is full throttle. 
I would guess perhaps 4 thou at our power levels. Also there are passages 
in the stock system for exhaust gases to heat the cool side. We generally 
disable those.

The Mazda engine designers obviously felt it was important to deal with this.

Paul Lamar
 
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