Way off subject 2 stroke

went to auction sat.and they sold a 1925 willys-knight automobile,and it had a 2 stroke engine very unusual design,no valves ,no cam, air entered through side of sleeve,how common was this back in the day?(last run in 1995)
 
Didn't know they were 2 stroke. Are you sure of that? Knight patented the "Sleeve Valve design. The sleeve actually moved up & down to open & close the intake & exhaust ports. Other manufacturers used the Knight design also, and were also required to use "Knight" in the name. Willy's Knight. Stearns Knight. There were others, but can't name them.
 
Loop-scavenged, piston ported, two-stroke engines were very common in the first half of last century. Most were small and used in power tools and outboard boat engines. In these engines, the only major moving parts are the piston, crankshaft, and connecting rod. Also, the intake port is a hole in the side of the cylinder which opens and closes as the piston passes by. Most modern two-stroke engines use a more positive crankshaft driven rotary valve to induct fresh air and fuel, as this gives more control of the intake timing. Some use a check valve instead. Some more exotic designs also have an oscillating or rotating sleeve which interfaces with the case to open and close holes which serve as the intake and exhaust ports. This gives the best control of timing, but is too complicated and expensive for most hand held power tools.
 
You're right John, they are not 2 stroke. Neat linkage that slides the sleeve. I've an old salesman's sample of a Knight engine, you rotate a knob and can observe the motion, crank, sleeve and piston moving in sync..............
 
They are a 4 stroke not a 2 stoke and they do have a cam. They just used sleeve valves. They were very dependable quiet running efficient engines. I know since I own one. You need to ckeck your facts.
 
I have no facts just an observation,so what does the cam do?the distributer drives from the generator,why would it not fire every stroke?,so is there no kind of air filtration on these?
 
The cam moves the sleves up and down and the pistons are inside the sleves. The moving sleve takes the place of the valves and opens and closes the intake and exhaust ports. They operate just like a conventional 4 stroke engine.
 

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