One of the simplest  things to improve the BSFC is run Iannetti silicon nitride
apex seals, Inconel apex seal springs, Mobile One synthetic oil and cut back on the rotor cooling.
One of the reasons for rotor cooling is keeping the apex springs working, the iron apex seals
from failing and preventing organic oil failure in the apex seal slot.

The same goes for the charge cooled engines.

Paul Lamar

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