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Which measurement identifies the base ignition timing on an older engine?

  • A.A dial gauge in the plug hole, which locates top dead centre and therefore establishes the timing directly
  • B.A timing light aimed at the crankshaft pulley marks
  • C.A dwell meter connected across the contact breaker, which indicates the timing as well as the closed period
  • D.A vacuum gauge

Answer: B

A stroboscopic timing light freezes the pulley mark against a scale on the timing cover. A dial gauge genuinely locates top dead centre for static timing, which makes the last option a real technique for a related purpose. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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