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Which plug feature suits a direct injection engine's charge motion?

  • A.A projected nose reaching further into the chamber
  • B.A recessed electrode, which is protected from the fuel spray and therefore resists fouling in such an engine
  • C.A wider gap
  • D.A surface discharge design, whose spark travels across the face of the insulator and resists any fouling entirely

Answer: A

Projecting the tip into the charge places the spark where the mixture is, and the incoming charge cools it. Surface discharge plugs genuinely exist for very heavily fouling applications, which makes the last option a real design rather than an invention. Checking which component actually carries the load settles most questions of this kind at once. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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