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 ID: 274862
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Objectives:Discuss the uses of small enginesObserve all safety precautions when working with small enginesDistinguish between two and four cycle engines explain how a 4 cycle engine operatesExplain how a 2 cycle engine operatesIdentify all the systems in a small engineExplain how the different systems of a small engine work
Fundamentals of Small Gas EnginesSlide2
Terms to knowInternal combustion engineExternal combustion engineFour cycle enginePistonCylinderCrankshaftBlockValvesIntake stroke
Compression stroke
Power stroke
Exhaust stroke
Flywheel
Two-cycle engine
Piston rings
Carburator
Venturi
Camshaft
Governor
Magneto
Primary circuit
Secondary circuitSlide3
Safety precautionsWear safety glasses and leather shoesKeep your hands, feet and other body parts from all moving parts.Do not allow burning material near oil, solvents or gasolineDo not smoke near openings of gasoline tanks or containersDisconnect 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 refuelingHandle gasoline outdoors whenever possibleSlide4
Safety precautionsNever disengage any of the safety equipment or devices on the engine or machineKeep all shields in placeDo not operate engines or force equipment beyond the designed capacityNever start and run an engine inside a building where the ventilation is inadequate.Never use gasoline as a solvent or to clean engine partsDispose of gasoline properly, by pouring it into an approved container. Never pour in onto the ground or down a drain.Slide5
Types of combustion engineshttp://www.animatedengines.com/otto.shtmlSlide6Slide7
How does a 4 stroke engine work?http://auto.howstuffworks.com/engine1.htmhttp://www.5min.com/Video/Starting-an-Internal-Combustion-Engine-145338934Slide8
2 stroke engineSlide9
How do 2 stroke engines work?http://science.howstuffworks.com/transport/engines-equipment/two-stroke2.htmhttp://videos.howstuffworks.com/howstuffworks/200-how-diesel-two-stroke-engines-work-video.htmSlide10
Engine SystemsCompression systemFuel systemIgnition systemCooling systemLubrication systemACTIVITY! Break yourselves into groups of 2-3Each 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.Slide11
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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