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Which role does an intake throttle play on a diesel recirculation system?

  • A.None, since a diesel engine is unthrottled and therefore has no throttle plate fitted to its intake system
  • B.Nothing
  • C.Restricting the intake slightly so a pressure difference exists to drive gas from the exhaust into the inlet
  • D.Creating a depression to drive the flow

Answer: D

A diesel needs a small throttle to create the pressure difference recirculation requires. The last option explains exactly that role, which makes it a correct and more instructive version. It also assists shutdown. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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