Practice question

What is 'valve overlap' in a four-stroke engine?

  1. The period when both the inlet and exhaust valves are open together around TDC at the end of exhaust/start of intake
  2. The clearance between the valve stem and the guide
  3. The thickness of the valve seat
  4. The time the engine spends in neutral

Answer: A — The period when both the inlet and exhaust valves are open together around TDC at the end of exhaust/start of intake

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