Although different engines may differ in their construct technology but they are based on the principle of a Can cycle. A typical four stroke petrol engine also undergoes four successive processes in each cycle.
1. The cycle starts on the intake stroke in which piston.
2. On the compression stroke, the inlet valve is closed and he mixture is compressed adiabatically by inwa
3.
On the power stroke, a spark fires the mixture causing a movement of the piston ng rapid increase in pressure and temperature. The burmi mixture expands adiabatically and forces the piston to move outward. This is the stroke which delivers power to crank shaft to drive the flywheels.
4. On the exhaust stroke, the outlet valves opens. The residual gases are expelled and piston moves inward .
The cycle then begins again. Most motorbikes have one cylinder engine but cars usually have four cylinders on the same crankshaft . The cylinders are timed to fire turn by turn in succession for a smooth running of the car. The actual efficiency of properly tuned engine is usually not more than 25 % to 30 % because of function and other heat losses .
Diesel Engine :
No spark plug is needed in the diesel engine Diesel is sprayed into the cylinder at maximum compression Because air is at very high temperature immediately after compression, the fuel mixture ignites on contact with the air in the cylinder and pushes the piston outward. The efficiency of in diesel engine is about 35 % to 40 % .
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