A Practical Approach to Motor Vehicle Engineering and Maintenance, Second Edition
By Allan Bonnick

1.11: Combustion in a petrol engine

1.11 Combustion in a petrol engine

As the piston reaches TDC the fuel is ignited by the spark at the spark plug and the burning process of the mixture begins. As the gases rapidly expand the piston is forced down the cylinder on the power stroke. The speed of the flame front must not exceed the speed of the power stoke. Figure 1.18 shows the combustion process occurring in a wedge-shaped combustion chamber of a petrol engine.


Figure 1.18: Combustion zones in a wedge-shaped combustion chamber
Copyright Derek Newbold and Allan Bonnick 2005 under license agreement with Books24x7
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