Practice question

In a standard four-stroke engine, what is the speed ratio of the crankshaft to the camshaft?

  1. 1:1 (they rotate at the same speed)
  2. 1:2 (camshaft rotates at twice the speed of the crankshaft)
  3. 2:1 (crankshaft rotates at twice the speed of the camshaft)
  4. 4:1 (crankshaft rotates at four times the speed of the camshaft)

Answer: C — 2:1 (crankshaft rotates at twice the speed of the camshaft)

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