Timing and Interference

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Timing and Interference

• By Stephanie Kwan

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Objective

• To understand how a basic engine works
• Link timing and interference
• See how the two affect the performance

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How Engines Work

• 4 Stroke Cycle- Intake Stroke- Compression
  Stroke- Combustion Stroke
• Note Valves are closed during compression and
  combustion for a sealed chamber in most ideal
  state

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Timing is Everything

• High Speeds- Piston must move up and down
  quickly- Valves are opened and closed quickly\
• Probelm - Not enough time for cylinders to fill
  up\
• Solution Intake valves open during exhaust
  stroke
• Performance Crankshaft and Camshaft must be
  adjusted accordingly

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Timing Advanced Techniques

• - Mechanical and Electrical Ways
• Larger engine- More fuel per rotation would
  combust
• Forced induction- Pressurized amount of gas in
  the engine
• VTEC (Variable Valve Timing and Lift Electronic
  Control)- At high RPMs open valves wide- At low
  RPMs open the valves small- Found in Hondas

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Conclusion

• Basic engines work in a 4 stroke cycle
• Timing is everything
• Valves
• Spark plug
• Advanced Techniques
• Large engines
• Forced Induction
• VTEC

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References

• http//static.howstuffworks.com/gif/camshaft-damag
  e.jpg
• http//www.first-to-fly.com/History20Images/1903_
  Engine_schematic.jpg
• http//auto.howstuffworks.com/engine1.htm