Radial sleeve valve.
Gear train makes a Swiss watch look simple.

Beautiful engineering all lost now , just living on memories.

Absolutely wonderful

Thanks for panning the camera. Lots of nice toys!

I like the way he has to hang on .

😢the radial sounds like a pack of Harleys

Underbart!

Get in ❤old school grunt 😊

I have a question here- so when the camera was at the front of the engine after ignition (one time), why was the output shaft NOT turning?  Jus' askin' here!

Which aircraft used this engine?

Did he suck that rag in to the intake hence the motor?