Four Stroke Engines

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Across
  1. 5. what might happen if a spark is delivered with open valves
  2. 6. this connects the crankshaft with the
  3. 7. in what direction does the piston turn
  4. 9. the stroke where only the intake valve is closed
  5. 10. the stroke when the electrical signal is delivered
  6. 11. this stroke is also known as the "bang" stroke
  7. 12. the stroke where fuel and gas enters the cylinder
  8. 13. what mechanism controls the timing
Down
  1. 1. this mechanism closes the valves
  2. 2. the colour of smoke when the electrical signal is delivered late
  3. 3. this opens the valves
  4. 4. this increases when a gas is heated
  5. 8. how many times can the piston revolve per minute