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...

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For rolling contact bearings like ball bearings, a condition called elasto-hydrodynamic lubrication occurs. At point of contact, ball deflects and flattens out slightly for a moment under high pressure. When ball rolls on, contact surfaces return to their original shape. However, lubricant is not forced away from point of contact due to dramatic increase in viscosity. When ball has passed, viscosity falls back again.

When grease is used for lubricating ball bearings, they also act as protection against impurities like dust, dirt and water that will cause wear down and corrosion.

More about oils and grease for lubrication could be subject of next topic.

Until next time...

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