Injection timing

The injection timing is the moment at which fuel is injected in a diesel engine.

In the case of mechanically controlled diesel engines, the fuel injection timing depends on the fuel cam position, in other words, the crankshaft position. When the injection cam presses the injection pump tappet roller, fuel is pressurized and injected.
In the case of common rail systems, the fuel injection timing is determined based on signals sent from the ECU. This means that fuel injection is possible at any time, regardless of the crankshaft position.

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