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All the air cooled units have piston cooling - the differences are in the size of the oil cooler and the size of the blower fan - thermostatic controlled on the turbo engines.
Use the turbo and manifold as on the 4.50 / 4.70 and leave the fuelling as it is but add another oil cooler / fan, and be very careful how hot she gets !
I e been doing a bit more delving, spoke to Bryco. Old boy there said they did a light turbo package for the 912. Gave me a turbo part number and pdf of the standard and turbo specs. Exactly the same apart from the output and exhaust temp. I’ll add a larger oil cooler with an electric fan up front to give it the extra cooling required.