Valve Timing Diagram for 4-Stroke Engine (Petrol and Diesel) As we all know in 4-stroke engine the cycle completes in 4-strokes that are suction, compression, expansion and exhaust , The relation between the valves (inlet and outlet) and piston movement from TDC to BDC is represented by the graph known as valve timing diagram. Theoretical. 1.. The following particulars are important for a four stroke cycle petrol engine regarding valve timing diagram : (a) The inlet valve opens (IVO) at 10° — 20° before top dead center (TDC) and closes 30° — 40° after bottom dead center (BDC). (b) The compression of charge starts at 30° — 40° after BDC and ends at 20° — 30° before TDC.

Engine Timing Explained
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Valve Timing Diagram For A Two-Stroke Diesel Engine : ( Port Timing Diagram For CI Engine ) In the valve timing diagram, as shown, we see that the expansion of the charge (after ignition) starts as the piston moves from TDC towards BDC. First of all, the exhaust port opens before the piston reaches BDC and the burnt gases start leaving the.. For the Four-stroke Petrol Engine also we can draw valve timing. Everything will be the same as this valve timing except the fuel ignition principle. In Four-stroke petrol Engine, we use the Air-Fuel mixture and spark plug for the combustion process. The rest is the same. But for a two-stroke Engine, we will have a Port Timing Diagram. If you.