That engine is either
a. Junkers Jumo 204
b Napier Culverin.
Napier licence built the Jumo 204. It was 720 hp 2 stroke diesel, vertically opposes 6 cylinder engin. It had two six throw crankshafts connected by a train of gears in the front of the engine.
Cheers norab you gottetright again its the Junkers ju 86. See link. Germany's Junkers Ju 86 medium bomber - World War II Vehicles, Tanks, and Airplanes
heres the pickture of it whit while its prepared to be brushed of from dust. the last remaining in linköping mueum. Plus a picture of the unsuccessfull Junkers Jumo 205 C diesel-engine
The second one I mention that used the Junkers Jumo 205C engine whas the Blohm und Voss Bv 138 A
nicknamed "Der Fliegende Holzschuh (The Flying Clog)". see Link View: https://www.youtube.com/watch?v=s9oEVuDXvK4