#How 4 stroke S.I engine works,#four stroke engine working principle
Points covered in this article -
What is its working mechanism, what is 4 stroke S.I engine, what is speed engine
4 Stroke SI Engine -
4 stroke IC engine is an engine that has 4 strokes in a cycle, each stroke doing a different job which is as given below
1-suction stroke
2-compression stroke
3-power stroke
4-exhaust stroke
1- suction stroke
When we have to start our engine, we turn the crankshaft by the kick or sell button, then
the piston starts to push from TDC to BDC, which is called the first stroke of the engine when the piston reaches from TDC to BDC.
Is. Until a mixture of both air and petrol enters the cylinder, when the piston comes down from TDC to the piston, the suction valve is opened which is opened by
the cam and follower and when the piston reaches BDC, the suction valve closes. The cam and follower are done, then the first stroke is complete.
2 compression strokes
When the piston moves from BDC to TDC, the fresh charge [which is filled with the first stroke] begins to compress,
causing a rise in the temperature of the fresh charge,
which is very high up to TDC. Shortly before reaching the spark, the spark comes from which starts [burning]
the fresh charge so that when the piston reaches TDC, we get heat energy [thermal].
then the second stroke completes
3 power strokes
In the power stroke, we do not have to do any work, but get it from the piston, which we call the power stroke.
1- When heat energy is received, it pushes the piston [down] and we get mechanical energy
Due to which the piston starts to slide down, when the piston reaches BDC, we get all the mechanical energy, then the power stroke is complete.
4 exhaust stroke -
When we get the thermal energy we burn [smoke gas] charge to get out of it, when the piston moves from BDC to TDC the exhaust valve works and the follower opens.
When the suction valve is closed, the burnt charge is expelled and the same process continues over and over again.
Some important things-
1-In the suction stroke, the suction valve remains open and the exhaust valve remains closed.
When the piston reaches BDC, both valves remain closed.
2-In the exhaust stroke, the suction valve remains closed and the exhaust valve opens to release the hot gases.
3 -In power stroke and compression stroke, both valves are
4 -The carburetor mixes both air and petrol
5- Air + Petrol + Spark combustion requires three things
6 - In the power stroke, not all energy goes to the wheels, some of the energy is collected to drive the rest of the stroke
7- In an SI engine the spark is extinguished by the action of ignition
8- Cam and follower to open and close the valve
9- The ratio of pressure in this is from 6 bar to 10.5 bar. It happens
10- S.I engine sound is low
11- C.I Engine noise is high
12- The wheel of the S.I engine is lighter
13- C.i My engine wheel is heavy
14- Piston of s.i engine is lighter
15 - The cylinder head of the s.i engine is less strong
16- s.i engine pressure is reduced