1. Timing and Interference
By Stephanie Kwan

2. Objective: To understand how a basic engine works
Link timing and interference
See how the two affect the performance

3. 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

5. 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

6. 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

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

9. References http://static.howstuffworks.com/gif/camshaft-damage.jpg