Identify the cycles of a four-stroke reciprocating engine.

Identification should include 

• intake—fuel and air is drawn in to the cylinders 
• compression—fuel and air mixture is compressed within the cylinders 
• power—ignited fuel and air mixture creates usable power to the propeller.
• exhaust—fuel and air mixture is burned and expelled from the cylinder
• valve duration/overlap—the period during engine operation when both intake and exhaust valves are open at the same time
• five events—intake, compression, ignition, power, and exhaust. 

Process/Skill Questions:

• What are the components of a four-stroke reciprocating engine?
• What are the four strokes of the Otto cycle?
• On what stroke does the spark from the sparkplug occur?
• What are the five events that occur in a reciprocating engine?
• What is the purpose of valve overlap?