This is the development of the WOHM 5cc diesel drum valve engine. The purpose of this engine is to develop a nostalgic vintage style control line engine for every day use in vintage models with the opportunity to produce a vintage style race motor. All the engines in this development program share the same bore and stroke and similar port configurations/timing although I sense a sidetrack from the familiar porting of these two engines to something a bit more speed orientated.

BORE = 19mm

STROKE = 18mm


Here is the second prototype for this engine.

The number one engine weighs in at a whopping 314 grms while the number two engine has managed to drop a few grams to weigh in at 274 grms. Lets hope the number three engine can shed a few more grams to improve the overall weight for the production engine.