250 horsepower (186 kW), (230 bhp at 2,250 rpm), increased
bore (111mm x 120 mm) to give a displacement of 9,477 cc,[1] increased
compression ratio. Reduction gearing.
Scorpio II and III
250 horsepower (186 kW), designed to run on 87
octane fuel with 6.5:1 ratio.[2]
Leo
280 horsepower (209 kW), few details, not flown or produced.
Libra
390 hp at 6,000 ft.[3] 725 lbs (329 kg). Tested but not flown or produced.