There are a few designs under this category, is actually more of a 4 stroke plus 2 with the extra so called cycles coming from a moveable cylinder head/piston. Don't know of any in production/in use. see link below for more info.
Invent
high cost
I'm not aware that there ever was such an engine.
This is a new and emerginf technology and needs to have a lot of research work for this.. so we have to study about this new technology too. Like the innovative design of NIYKADO Six Stroke Engine.
2 stroke and 2 cycle mean the same thing
any gas station. its called gasoline There is such a thing as a 2-stroke or a 4-stroke engine, but the fuel is the same (gasoline). The difference being that the 4-stroke engine uses regular gasoline straight from the pump while on the 2-stroke engine you have to mix 2-cycle oil with the gasoline.
Explain the advantages of four-stroke engine over two-stroke engine
two stroke
There have been many examples of a 350cc two stroke engine made over the years. Kawasaki and Yamaha motorcycles used this type of engine as well as many other manufacturers.
Why the fuel consumption is less in 4 stroke engine as compared to 2 stroke engine
There is no difference, they mean the same thing.
in my opinion a two stroke engine is a better quality engine as compared to a four stroke engine!