The firing order is designed to provide for balance and to eliminate vibration to the greatest extent possible. The firing order of an engine is the sequence in which the power event occurs in the different cylinders. When designing an engine, choosing an appropriate firing order is critical to minimizing vibration and achieving smooth running, for long engine fatigue life and user comfort, and heavily influences crankshaft design. This is achieved by sparking of the spark plugs in a gasoline engine in the correct order, or by the sequence of fuel injection in a Diesel engine. The firing order is the sequence of power delivery of each cylinder in a multi-cylinder reciprocating engine. The order in which various cylinders of a multi-cylinder engine fire is called the firing order.
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