This is confirmed by Rotax in the Installation Manuals:
They state: "The size and type of radiator should be adequate to transfer
thermal
energy of approx. 28kW (912S) 30kW (914)". For the cylinder barrel, they say:
"the cooling air ducts must be designed such that they transfer thermal energy
of approx. 6 kW. "
That means that up to 83 % of the cooling is done through the water-cooled
heads.
Obviously, in case of a total loss of coolant, the engine will not run for
long with the remaining 17%.
Remi
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http://forums.matronics.com/viewtopic.php?p=424389#424389
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