6.5 ccm sleeve valve engine

grabcad

Introducing the pioneering 6.5 cc, .40 cubic inch four-stroke engine that incorporates Burt McCollum's sleeve valve technology, prominently utilized in WWII British aircraft engines like Napier Sabre and Bristol Hercules. In this initial prototype, a configuration of two intake ports and two exhaust ports was employed, with the carburetor situated behind the exhaust pipe in front of the cylinder. The engine features SKF type ball bearings, and pinion blanks can be found at http://www.maedler.ch. Curiosity abounds as to its functionality.