How do you adequately cool a 4 rotor? You'd need to re-direct the coolant flow in some way, right?

Brian Trubee

For a car it is not a problem due to the low duty cycle. What Mazda did with the Lemans four
rotor was feed water into the center housing and let it flow forwards and back in an attempt
to cool the rotors uniformly. That is why the rear rotor always runs hotter in the
13B.

NSU, Mercedes Benz and Curtiss Wright in their four rotor engines used
an external water manifold  for parallel cooling.
Difficult to do with Mazda axial flow cooling. Easy to do with NSU type radial flow
cooling. Parallel cooling has been and still is used for heavy duty liquid
cooled engines right from the start. Everett Hatch took a stab at it
with the 13B and gave up.

Paul Lamar

The ultimate aluminum center housing would be designed with parallel cooling
in mind. In other words there would be a split so water would go fore and aft.

Paul Lamar
 
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