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Which voltage is typically required to jump a spark plug gap under compression?

  • A.Between 10,000 and 30,000 volts
  • B.About 1,000 volts, which is sufficient because the compressed mixture conducts more readily than air at rest
  • C.About 400 volts
  • D.About 100,000 volts, which is required because the pressure within the cylinder is very high at the moment of firing

Answer: A

Ten to thirty thousand volts is typical, rising with compression pressure and with a worn gap. Compression raises rather than lowers the required voltage, which makes the second option wrong in its reasoning as well as its figure. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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