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Which engine type suffers worst from intake fouling?

  • A.Neither
  • B.An engine whose fuel never passes the inlet valves, since no fuel washes the deposits from the port surfaces
  • C.A direct injection diesel or petrol engine
  • D.A port injected petrol engine, whose fuel spray washes the valves and therefore accumulates the greatest deposits

Answer: C

Port injected fuel washes the valve; direct injection does not. The last option explains exactly that difference, which makes it a correct and more instructive version of the same answer. Checking which component actually carries the load settles most questions of this kind at once. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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