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Which advance does a light load charge require?

  • A.Less advance at low speed and more at high speed, which is the combined effect of the two advance mechanisms fitted
  • B.More advance because the charge burns more slowly
  • C.Less advance, since the reduced quantity of mixture burns more quickly than a full charge would do
  • D.The same advance

Answer: B

A dilute charge at light load burns slowly, so the spark must occur earlier for the pressure peak to arrive at the right moment. That is the whole basis of vacuum advance. Full load needs less advance and risks detonation. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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