![]() Remove the cylinder head cover and identify the inlet valve exhaust valve and piston of particular cylinder. This is because better evaporation and mixing fuel. This overlapping is more than the petrol engine.įuel valve opening and closing: The fuel valve opens at 10 to 15 before TDC and closes at 15 to 20 after TDC. ![]() The crank angles for which the both valves are open are called as overlapping period. It is clear from the diagram, for certain period both inlet valve and exhaust valve remains in open condition. To achieve this the exhaust valve is open at 250 to 450 before BDC and closes at 100 to 200 after the TDC. To avoid this, the inlet valve is kept open for 400 to 500 after the BDC.Įxhaust valve opening and closing : Complete clearing of the burned gases from the cylinder is necessary to take in more air into the cylinder. If the inlet valve is allowed to close at BDC, the cylinder would receive less amount of air than its capacity and the pressure at the end of suction will be below, the atmosphere pressure. This is necessary to ensure that the valve will be fully open when the piston reaches the TDC. Inlet valve opening and closing : In an actual engine, the inlet valve begins to open 50 to 200 before the piston reaches the TDC during the exhaust stroke. But in actual practice it will differ.ī1 PREPARED BY BIBIN.C and S.GOBINATH, AP/MECH, RMKCETī2 PREPARED BY BIBIN.C and S.GOBINATH, AP/MECH, RMKCET The fuel is ignited when the piston is at TDC at the end of compression stroke. The exhaust valve opens at BDC and close at TDC. In an ideal engine, the inlet valve opens at TDC and close at BDC. In the case of horizontal engine this is known as “Inner Dead Centre” (IDC). The extreme position of the piston at the top of the cylinder is called “Top Dead Centre” (TDC). ![]() In the case of horizontal engine, this is known as “Outer Dead Center”(ODC). The extreme position of the piston at the bottom of the cylinder is called “Bottom Dead Centre”. The diagram which shows the position of crank of four stroke engine at the beginning and at the end of suction, compression, expansion and exhaust of the engine are called as valve timing diagram. To draw the valve timing diagram of the given four stroke cycle diesel engine.Īpparatus Required : 1. VALUE TIMING DIAGRAM OF FOUR STROKE CYCLE diesel ENGINE Exp.
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