![]() ![]() Four-stroke engines must also time the valve openings relative to the firing order, as the valves do not open and close on every stroke.įiring order affects the vibration, sound and evenness of power output from the engine and heavily influences crankshaft design.Ĭylinder numbering Numbering systems for car engines In a diesel engine, the firing order corresponds to the order in which fuel is injected into each cylinder. gasoline/petrol) engine, the firing order corresponds to the order in which the spark plugs are operated. The firing order of an internal combustion engine is the sequence of ignition for the cylinders. ![]() For this inline-4 engine, 1-3-4-2 could be a valid firing order.
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