Compare between as 4-­‐stroke engine and 2-­‐stroke engine?

Ans:

Subsequent to my last post,this is what a friend asked me, so I’ve decided  to write about engine for a few posts.Let’s first look briefly at how a 4-­‐stroke engine works

2 stroke engine:

1. 2-strokes run either premix (oil and fuel mix) or oil injection where oil is injected into the engine.

2. 2-strokes produce more power than 4-strokes. Cubic Centimeter to Cubic Centimeter or Cubic Inches to Cubic Inches a 2-stroke will produce at least 20% more horsepower and torque than a 4-stroke of the same engine size. 

3.2-strokes produce a power stroke every revolution of the crankshaft, where 4-strokes produce a power stroke every other revolution of the crankshaft.

4.2-strokes fewer moving parts. This makes them easy to maintain.

4 stroke engine:

1. 4-strokes will run an oil pump to pump oil to the top end and oil the valves. The crank of most 4-strokes spin in the oil. This splashes the oil up onto the moving lower end parts. It also causes horsepower loss due to the moving parts hitting the oil.

2. 4-strokes will usually get better mileage than a 2-stroke. This is due to a 4-strokes more efficient combustion process. 2-strokes use the piston ring(s) as the engine valves. It's effective, but not efficient.

3. 4-strokes are much more complex. This makes them much more difficult to maintain.

4. 4-strokes do require less rebuilding than 2-strokes. But a 4-stroke is much more expensive to rebuild, so they almost end up the same in the end.

5.4-stroke engines are much heavier than 2-stroke engines.

SEE U NEXT TIME