Diesel engine fuel delivery

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Timing[edit | edit source]

Fuel delivery timing effects the engine in a number of ways

Advancing the injection timing has the following effects:

Increasing

  • Cylinder pressures/temperatures
  • Black smoke at peak torque
  • Emissions of oxides of nitrogen (NOx)
  • Black smoke at peak torque

Decreasing

  • White smoke
  • Black smoke at tick over
  • Black smoke at designed rated power
  • Exhaust temperature
  • Brake specific fuel consumption
  • Hydrocarbons (HC)

Setting the injection timing involves balancing power and emission requirements. The engine material tolerances limit the advance due to the increase in peak pressure/temperature.