The Sleeve Valve Engine

DIRECTORY

What exactly is a sleeve valve engine anyway, you may ask
To begin with, we recommend you forget about valves as there aren't any. At least not in the sense of the familiar mushroom or "Poppet" type valves we have on most modern engines.
Pistons, yes. The regular type, operating from a crankshaft and connecting rods the same as a conventional internal combustion gasoline engine.

But then, inside the cylinder, between the piston and the cylinder wall, you have two perfectly machined and well fitting sleeves, one inside the other in a precision fit sliding up and down.
These sleeves are powered, by a another little crank-or-cam-shaft, with short connecting rods, one for each sleeve, to push them up and down.
Cut into the sides of the sleeves are port holes, or slots, in such a manner that the sleeves slide up and down. The ports, match ports in the intake and exhaust manifolds in proper timing to act as valves. One side acting as the exhaust and the other as the inlet valve.
In effect a conventional engine except for the Valves

Dual Sleeves

Two cylindrical metal sleeves, one within the other, sliding quietly up and down on a film of oil, provide perfect intake and exhaust passages as the port openings pass each other.
This simple valve operation repeats itself without wear or attention. Carbon accumulation seals compression.