The fuel is supposed to burn so fast as to explode. So there is no point in injecting it more than it can burn. If fuel is not able to catch fire, it will remain in piston as unburnt fuel.

So timing of fuel injection will stop slightly after piston has reached top dead center.

The explosion inside piston is driving force for engine. It will create momentum to turn engine for next 2 cycles.

The next cycle is exhaust stroke. In this stroke, all products of combustion is driven off from piston top. The exhaust valve(s) will have opened to allow combustion gases to escape. In an ideal engine, these include carbon dioxide gas, water vapor and excess air.

However, in actual practice, combustion may not be so perfect. Carbon particles, unburnt fuel particles, lubricating oil particles, sulphur dioxide, carbon monoxide, and ash may also be discharged. As piston will not be able to reach the cylinder head perfectly, not all exhaust gas can be driven off completely. A small quantity of these exhaust products will remain inside cylinder even as next cycle starts.

Once exhaust gases have been driven off, next stroke starts. This is air intake stroke that we started off with. The cycles repeat itself as engine runs continuously.

Obviously more exhaust gas can be driven off, and more oxygen content cylinder can contain, more efficient combustion of fuel can be achieved.

This can be achieved by supercharging and cooling air intake.

Well folks, that should boost up your power!

"PRODUCE YOUR BEST WITH THE BEST!" Hard-to-find tools become easy-to-find. Hard-to-find Tools

The power developed in a 4-stroke engine is based on formula, Power = PLAN/2, where,

P is mean effective pressure inside cylinder, L is stroke length of piston travel, A is cylinder bore or area of piston top, N is number of revolutions per unit time.

In a 2-stroke engine, because power is developed in same revolution, formula for Power becomes, P = PLAN

This means that with same mean effective pressure, stroke length and bore (area), 2-stroke engine can develop twice power of a 4-stroke engine!

If size, weight, and material cost are causes for concern, 2-stroke engine has clear advantage.

Well folks, 2-strokes have advantage of higher power with small size. However, there are some disadvantages too. That could be discussed later...

"PRODUCE YOUR BEST WITH THE BEST!" Hard-to-find tools become easy-to-find. Quality Tools