Effect of Engine Size, Flywheel Size and Firing order of Car Engines | Which Engine Size is Best | Does Engine Size Effect Performance

Firing order:

In 4 – cylinder Engines:1-3-4-2 or 1-4-3-2

In 6 Cylinder Engines: 1-5-3-6-2-4

In 8 Cylinder Engines: 1-5-4-2-6-3-7-8

In V-8 Engines : 1-8-4-3-6-5-7-2

Effect of Engine Size:

• Doubling cylinder diameter would increase the power to four times
• Doubling the stroke length would double the power
• Doubling stroke length would double the piston speed. If piston speed should not change, crankshaft speed would need to be halved when stroke length id doubled
• Doubling both the cylinder diameter and stroke length would increase torque to eight times

Effect of Flywheel Size:

• Size of the flywheel determines the energy absorbed during the power stroke and released during other three strokes. Thus it would determine the amount of speed fluctuation during a cycle
• A larger flywheel would have higher inertia, which would mean sluggish response; in other words, the acceleration or deceleration of engine would be slow

Use of Multi-cylinder Engine:

• In a multi-cylinder with staggered power stroke, ratio of maximum to mean torques is greatly reduced, reducing the size of the flywheel required, leading to higher response which makes it suitable for automotive application

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