WHAT IS A STROKE
Stroke is a motion of a piston.
WHAT IS A 2 STROKE & 4STROKE ENGINE
A two-stroke engine is an engine that completes a power cycle with two strokes of the piston during only one crankshaft revolution.
A four-stroke engine is an internal combustion engine in which the piston completes four separate strokes while turning the crankshaft.
OPERATION OF THE 2 STROKE & 4 STROKE
A four-stroke has separate piston stroke for each 4functions necessary to spark ignition engine: Intake, Compression, Power and exhaust.
A two-stroke engine all five functions of the cycle are completed in only 2 stroke of the piston or one revolution of the crankshaft.
COMPARISON OF THE 2 STROKE&4 STROKE ENGINE
| Two Strokes | Four Stroke |
| It has one revolution of the crankshaft during one power stroke | It has two revolutions of the crankshaft during one power stroke |
| It generates high torque | It generates less torque |
| Its uses port for fuel’s outlet and inlet | It uses valves for outlet and inlet of a fuel |
| Its engines result in lesser thermal efficiency | Its engines result in higher thermal efficiency |
| It has a larger ratio in terms of power to weight | It has a lesser ratio in terms of power to weight |
| It generates more smoke and shows less efficiency | It generates less smoke and shows more efficiency |
| Requires more lubricating oil as some oil burns with the fuel | Requires less lubricating oil |
| Due to poor lubrication, more wear and tear occurs | Less wear and tear occurs |
| Engines are cheaper and are simple for manufacturing | Engines are expensive due to lubrication and valves and are tough to manufacture |
| Engines are basically lighter and are noisy | Engines are basically heavier because its flywheel is heavy and are less noisy |