Pratt & Whitney R-985 radial engine cutaway - GIF

Pratt & Whitney R-985 radial engine cutaway.

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Previously:

Radial engine air compressor - video
Radial engine assembly animation - GIF
Radial engine motorcycle - photos
Wooden radial engine - GIF
Wright 18-cylinder radial engine - video
Zvezda M503 maritime radial diesel engine - photos

After looking at the valve action, it looks to me like it's rotating backwards.