Another negative to running the coolant through the block slowly is the
effectiveness of the heat transfer in the hot zone of the engine. Hot zone
cooling is a strong function of coolant velocity (not just mass flow and
delta T). The coolant passages would need to be re-optimized to increase the
local velocity. Might not be an issue at naturally aspirated power levels,
but at some power point it will become an issue.

Jon Lauter
Rotary Power Marine Corporation

 
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