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Fundamentals of Small Gas Engines

Fundamentals of Small Gas Engines. Objectives: Discuss the uses of small engines Observe all safety precautions when working with small engines Distinguish between two and four cycle engines explain how a 4 cycle engine operates Explain how a 2 cycle engine operates

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Fundamentals of Small Gas Engines

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  1. Fundamentals of Small Gas Engines Objectives: Discuss the uses of small engines Observe all safety precautions when working with small engines Distinguish between two and four cycle engines explain how a 4 cycle engine operates Explain how a 2 cycle engine operates Identify all the systems in a small engine Explain how the different systems of a small engine work

  2. Terms to know • Internal combustion engine • External combustion engine • Four cycle engine • Piston • Cylinder • Crankshaft • Block • Valves • Intake stroke • Compression stroke • Power stroke • Exhaust stroke • Flywheel • Two-cycle engine • Piston rings • Carburator • Venturi • Camshaft • Governor • Magneto • Primary circuit • Secondary circuit

  3. Safety precautions • Wear safety glasses and leather shoes • Keep your hands, feet and other body parts from all moving parts. • Do not allow burning material near oil, solvents or gasoline • Do not smoke near openings of gasoline tanks or containers • Disconnect spark plug cable prior to making any adjustments on machines to prevent the possibility of accidental engine start up. • Stop the engine and allow it to cool before refueling • Handle gasoline outdoors whenever possible

  4. Safety precautions • Never disengage any of the safety equipment or devices on the engine or machine • Keep all shields in place • Do not operate engines or force equipment beyond the designed capacity • Never start and run an engine inside a building where the ventilation is inadequate. • Never use gasoline as a solvent or to clean engine parts • Dispose of gasoline properly, by pouring it into an approved container. Never pour in onto the ground or down a drain.

  5. Types of combustion engines • http://www.animatedengines.com/otto.shtml

  6. How does a 4 stroke engine work? • http://auto.howstuffworks.com/engine1.htm • http://www.5min.com/Video/Starting-an-Internal-Combustion-Engine-145338934

  7. 2 stroke engine

  8. How do 2 stroke engines work? • http://science.howstuffworks.com/transport/engines-equipment/two-stroke2.htm • http://videos.howstuffworks.com/howstuffworks/200-how-diesel-two-stroke-engines-work-video.htm

  9. Engine Systems • Compression system • Fuel system • Ignition system • Cooling system • Lubrication system • ACTIVITY! Break yourselves into groups of 2-3 • Each group is responsible for 1 system in the engine. You need to either make a descriptive poster or power point describing your engine system. YOUR group will be RESPONSIBLE for TEACHING other groups about your SYSTEM.

  10. QUIZ! • What is the purpose of oil in the engine? • What is the governor? • What is the difference between a 2 stroke and 4 stroke engine? • What are some common causes of compression loss? • What connects the piston to the crankshaft? • What are piston rings needed for?

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