Porsche PFM 3200 engine

The Porsche PFM 3200 was a six-cylinder, air-cooled, horizontally opposed aircraft engine of about 3.2 litres that Porsche developed in the 1980s from the flat-six of its 911 sports car. PFM stands for Porsche-Flugmotoren, the name of the division that designed it. The normally aspirated N series made about 160 kilowatts and the turbocharged T series about 180, and a reduction gear of 0.442 to 1 let the high-revving engine turn ordinary propellers. Introduced in late 1985, it was fitted to aircraft such as the Mooney M20L, the Robin DR400 and the Extra 330, but it was heavier and bulkier than rival engines, and Porsche closed the line in 1991 after delivering about 80 engines. Only the Mooney M20L entered production with it, and Porsche surrendered the type certificate in 2007.