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Across
  1. 1. Opens and closes valves.
  2. 3. Delivers fuel to cylinder.
  3. 5. Controls engine speed.
  4. 7. Moves within a cylinder.
  5. 11. Connects piston to crankshaft.
  6. 13. Cleans incoming air.
  7. 15. Reduces emissions.
  8. 17. Houses the piston.
  9. 19. Ignites fuel-air mix.
  10. 20. Drives cooling fan.
  11. 22. Converts linear to rotary motion.
  12. 24. Circulates engine oil.
  13. 25. Controls fuel/air entry.
Down
  1. 2. Generates electrical power.
  2. 4. Regulates engine temperature.
  3. 6. Reduces exhaust noise.
  4. 8. Mixes fuel with air.
  5. 9. Expels combustion gases.
  6. 10. Stores electrical energy.
  7. 12. Cranks the engine.
  8. 14. Cools the engine.
  9. 16. Main engine casing.
  10. 18. Car's power source.
  11. 21. Distributes air/fuel mix.
  12. 23. Sends fuel to engine.