Porsche aero engine

[Dr Jekyll]

Why did the Porsche PFM 3200 engine not catch on?

[gasax]

If you look up what the installation in a Mooney entailed you'll find it blindingly obvious!

[Auxtank]

Not only what gasax says above but once in it was hideously complicated to work on with complex parts and it was a heavy old lump.
Simplicity won through in the end and Lycoming started producing for them again and then it went to Continental.

[Jan Olieslagers]

From wikipedia I learn that a lot of money was dumped into the project, more than it could ever recover. Perhaps slightly overdone on the "Deutsche Gründlichkeit" bit.

[horizon flyer]

The crank shaft tended to snap, they are very light compared to aero engines and other Auto shafts so that was it's end.