Two stroke internal combustion engine is known for its simplicity of design, high power output, low weight, low cost and ease of maintenance. The two stroke engine which has been the mainstay of the two wheelers and some of the four wheelers, as well as portable power tools since long, is gradually being phased out due to its higher emission levels. However, it is worth a look.
Although it was Alfred Angas Scott, who is attributed a first practical two-stroke engine which was used in making water-cooled twin-cylinder motorcycles.
The basic principle of operation of a two stroke engine remains the same, but the variants have been developed relating to how fuel is introduced to the cylinder and how exhaust gases are sifted.
Main Parts of a Two Stroke Engine:
A two stroke engine is simpler in construction compared to a four stroke engine and does away with the complicated timing belt and overhead camshaft driving the valves.
The main parts:
The shaft may be connected to a gear box through a clutch assembly.
Power is generated in a two stroke when the piston twice moves vertically. The two stroke cycle goes like this:
Two stroke engines are small, lightweight and more powerful. They have fewer moving parts, cost less and also cost less to maintain. From small power tools to giant ships, two stroke engines can provide high power to weight ratio along with simplicity of operation.
One of the biggest challenge is to improve lubrication by separating fuel from lube oil and improve upon the separation of intake and exhaust gases to deliver higher fuel efficiency.