Since the basic difference between 2 and 4 stroke (or cycle) is the idea that a 2 stroke engine fires every revolution of the crankshaft whereas a 4 stroke fires every other revolution, you can't have both.
2 stroke engines have transfer ports in the cylinder walls for intake and exhaust instead of valves. Their cyl head is basically a cover. Their oil and gas mixture travels through a closed crankcase for lubrication and that is also part of the process. However Detroit Diesel has 2 stroke diesel engines (fires every rotation) that also have 4 exhaust valves in the head like conventional. The intake is through ports in the cyl wall but has a regular lubrication system like a 4 stroke engine.
Maybe something like that but I haven't heard of any other.
2 stroke engines have transfer ports in the cylinder walls for intake and exhaust instead of valves. Their cyl head is basically a cover. Their oil and gas mixture travels through a closed crankcase for lubrication and that is also part of the process. However Detroit Diesel has 2 stroke diesel engines (fires every rotation) that also have 4 exhaust valves in the head like conventional. The intake is through ports in the cyl wall but has a regular lubrication system like a 4 stroke engine.
Maybe something like that but I haven't heard of any other.