This is a huge problem. The Mazda serial cooling scheme
was done for low cost but it soon becomes a problem
when building high HP engines. It is also called axial flow.
The water goes in the front rotor housing  and works its way
to the back rotor housing. Consequently the rear rotor always
runs hotter.

Most car engines are the same serial cooling.

As far back as WW I parallel cooling was used on water cooled aircraft
engines. Each cylinder got the same water temperature.

Heat pipes may have a role to play helping to cool the
lower spark area.

Paul Lamar


Check Stewart Systems (I believe that is correct) and read their Serial  Cooling blurb. It is aimed at V8 applications but should be able to be applied to any liquid cooled engine. Caterpillar had copper directors that were pressed into cooling holes in the head to direct coolant to hot areas; the exhaust seats and around the injector or spark plug on natural gas engines. Swagelok has drill through fittings available. With there use you could weld or flatten the end of a tube and then drill holes in the side to direct coolant around the spark plugs. You then just need to mark the outer end to make certain it is aimed correctly. Then a coolant manifold is built to bring coolant directly from the water pump outlet.
Dale Davies


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