Dual fuel engines utilize two fuels (one in gaseous form and the other in liquid form) for their working. In dual fuel engine, the primary fuel (in gaseous form) is mixed with air outside the cylinder before it is inducted into the cylinder. After induction in the cylinder, the mixture of gas and air is compressed during the compression stroke and before the end of the stroke, near TDC, a pilot quantity (about 20%) of liquid fuel (normally diesel) is injected to initiate combustion.

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Keywords: Dual Fuel Engines, Gaseous Form, Liquid Form, Compression Stroke, Combustion.