He did a series in model engineer a long while back. It was for his stationary, then the loco

The principle of method of functioning is that the piston runs within an inner cylinder which itself slides back and forth within an outer cylinder. The inner cylinder has ports drilled in it which at certain positions of travel line-up with ports in the outer cylinder.

The inner cylinder position relative to the outer cylinder is changed by the piston sliding back and forth as the travel of the piston is longer than the length of the inner cylinder.

To call the engine 'valveless' is misleading (I suggest) as it is actually a sleeve-valve engine with the movement of the sleeve driven by the piston travel at each end of the stroke.

Regards,

Phil

Edited By Weary on 22/04/2021 21:22:29

Edited By Weary on 22/04/2021 21:22:58

Edited By Weary on 22/04/2021 21:51:00

Ahh Yes – a sleeve valve indeed. Wonderful engines, smooth, quiet, and surprisingly efficient. We looked long and hard at a sleeve valve system for a F1 engine – but then the regulations banned anything other than poppet valves.

Martin