What is the difference between TDI and common rail?

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Tdi uses an injector pump. Each injector has its own fuel pipe coming from the pump. Timing on the pump is very importand. Crd or common rail has just the rail where the injectors connect to. The pressure in the rail is constant. The ecu controls the injection amount. On tdi the pressure on each pipe opens the injectors. Crd's are more used because they are cost effective.

First answer by Sound24. Last edit by Sound24. Contributor trust: 65 [recommend contributor]. Question popularity: 16 [recommend question]

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