THE REBIRTH OF TWO STROKE ENGINES

Just in case you think the two stroke cycle engine will become obsolete, I advice you have a rethink because it will never be.

The two stroke cycle engine is a type of internal combustion engine(I.C.E) that was developed to obtain high power output from a simple engine size and valve design via the movement of the piston during one crankshaft revolution. It works in spark ignition and combustion ignition engine.

The general principle in which engines operate is based on

• Induction
• Compression 
• Power or expansion 
• Exhaust

However the two stroke cycle engine uses port(inlet port, transfer port and exhaust port) instead of valve to carryout the induction and exhaust operations. In every 360° rev, one cycle is completed i.e in every 180° rev, two strokes(exhaust and induction) followed by the compression  and power stroke to complete the cycle.

In the two stroke cycle the charge is introduced through the inlet port from the carburetor into the crankcase to generate partial pressure on the charge, when the piston is at TDC . The downward movement of the piston causes the partially compressed charge to move into the cylinder through the transfer port. The compression stroke follows immediately to ignite the charge when the piston moves upward thereafter the power stroke causing the exhaust port to open for scavenging.

• For the same size of flywheel the two stroke cycle engine runs smoother.
• Theoretically the two stroke produces double the useful power to that of a four stroke engine with the same cylinder capacity
•  lubrication of oil and fuel mixture can be done with the ratio of 1:16 and 1:24
• Less maintenance

Though they are not used for automobile due to mixed oil and fuel, over heating under heavy driving conditions and other factors but they are as important as the four stroke engine.