Timing and Interference

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Presentation transcript:

Timing and Interference By Stephanie Kwan

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

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

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

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

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

References http://static.howstuffworks.com/gif/camshaft-damage.jpg http://www.first-to-fly.com/History%20Images/1903_Engine_schematic.jpg http://auto.howstuffworks.com/engine1.htm