Four stroke engine
Now day every engine is four stroke but previous time use to two stroke engine. Four stroke engine is high efficient compare to the two stroke engine. Four stroke engine has more advantages comparer to the two stroke engine. In four stroke engine does not require fuel mix with oil. Four stroke engine complete one cycle in four stroke. Four stroke same in petrol and diesel engine but some difference in ignition process.
How to work four stroke petrol and diesel engine ?
There are four stroke available in four stroke petrol and diesel engine.
1) Intake stroke
2) Compression stroke
3) Power stroke
4) Exhaust stroke
1) Intake stroke :
In intake stroke pressure difference between atmospheric pressure and inside cylinder pressure the intake valve open therefore fuel and air go into the cylinder in petrol engine and when fuel go into the cylinder in diesel engine piston move TDC ( Top Dead Centre) to BDC ( Bottom Dead Centre). In intake stroke exhaust valve close. After intake stroke intake valve close.
2) Compression stroke :
In compression stroke both intake valve and exhaust valve close. During compression stroke piston goes to TDC ( Top Dead Centre) to BDC ( Bottom Dead Centre). Then fuel will be compress.
3) Power stroke :
In power stroke both intake and exhaust valve close. During Power stroke the compress fuel is ignited by spark plug in petrol engine and when hot air gases ignite fuel in diesel engine. In power stroke after ignition the piston move from TDC (Top Dead Centre) to BDC ( Bottom Dead Centre). In this stroke power is produce.
4) Exhaust stroke :
After power stroke fuel gases produced. It required to remove them out of the engine. In exhaust stroke due to pressure difference between cylinder and atmospheric pressure the exhaust valve open and fuel gases out of the cylinder. During exhaust stroke intake valve close. After exhaust stroke crankshaft take one revolution.
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