Yesterday I spent a few hours in an Aviation Museum just half an hour away from my house.
Besides several interesting planes they show also several engines and turbines for planes. As a mechanical engineer who graduated (... long ago) in combustion engines I consider these true masterpieces of engineering ...
This is a BMW 801A, 2000 hp engine from 1944.
The design is a 14 Cylinder double-star configuration (i.e. 2 rows each with 7 cyl. in "star"configuration)
And Jer (@Sailor) this one is for you: basically a "Neunelfer" Porsche engine with Bosch K-Jetronic fuel injection as propulsion for small planes.
The engine designation is Porsche PFM 3200