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The crank angle period during which the primary current builds in the coil is called the _____.

  • A.dwell
  • B.advance, which is instead the angle before top dead centre at which the spark is delivered to the cylinder
  • C.firing voltage
  • D.burn time, which is the period during which the spark is sustained across the electrodes after it has been struck

Answer: A

Too little dwell leaves the coil undercharged and the engine misfires at high speed, which was the characteristic weakness of a contact breaker system. Electronic modules hold the dwell constant in time rather than in degrees. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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