Some older engine restorations/replicas in action ....

[WTE_Galway]

Royal Aircraft Factory FE2B restored Beardmore engine running ...

http://thevintageaviator.co.nz/projects/beardmore-engine/video-beardmore-engine-action

Fokker Dr.I and Fokker D.VI. Oberursel UR.2 engine ...

http://thevintageaviator.co.nz/projects/oberursel-engine/urii-action
http://thevintageaviator.co.nz/projects/oberursel-engine/rotary-engine-detail

[IvanK]

Lovely stuff