Home > Knowledge > Content

Why are the flywheels in a 2 stroke engine lighter than in a 4 stroke engine?

- Jan 10, 2019 -

Why are the flywheels in a 2 stroke engine lighter than in a 4 stroke engine?

flywheel assembly

The purpose of the flywheel is to store and supply kinetic energy to the engine to enable it to rotate during the periods, when the engine is not producing energy.

In a two stroke engine, firing takes place every revolution, whereas in a four stroke engine, firing takes place every alternate revolution. In two stroke engine, the eigine generates energy for approximately 180 degrees of rotation of the crankshaft and therefore needs energy from the flywheel for the remaining 180 degrees before the engine fires again. In a four stroke engine,the engine generates energy for 180 degrees of crankshaft rotation and therefore needs energy from the flywheel for the remaining 270 degrees of crankshaft rotation.

From this it is seen that the energy storage requirement in a four stroke engine is higher. Therefore the flywheels used in four stroke engines are heavier. To be precise, the flywheel should have a higher moment of inertia about its axis of rotation rather than just be heavier .

The difference is not very much higher as the energy requirement during exhaust and suction strokes are small compared to the energy requirement during the compression stroke.

Quote from:www.quora.com

Related Industry Knowledge

Related Products

  • Showbull Petrol 2Stroke Chainsaw 58cc
  • 20-Inch 3.5 HP 58cc Gas Powered Smart Start Chainsaw
  • Petrol Trimmer Brush Cutter Professional Garden Tool
  • Fabulous Performance Gas Chainsaw
  • Professional Gas Chain Saw
  • Oregon Chainsaw with 40cc