Informative Speech Outline

How a combustion engine works General Purpose: To inform Specific Purpose: to inform my listeners how a combustion engine works. Central Idea: The injectors supply fuel to the cylinder through the intake valve in which a spark plug ignites the fuel if in the cylinder. The explosion from the fuel and spark created in the chamber known as the combustion chamber pushes the cylinder in a downward motion. As the time the cylinder is moving a downward motion, the exhaust valve opens and releases the gases created by the explosion.

Shortly after the exhaust valve opens it closes and the counter weights on the current send the piston inside the cylinder back up towards the combustion chamber in which the whole process repeats itself. Introduction: I. Attention Material a. Injectors/Carburetor i. Difference between the two ii. Fuel supply system b. Different types of engines iii. Two Stroke iv. Four Stroke v. Diesel II. Orienting Material c. The internal combustion engine was invented by Jean Joseph Etienne Lenoir in 1860 that ran of coal gas. d.

Siegfried Marcus in Austria in 1864 was able to create an engine that uses petrol as a fuel. e. The engine is used in our everyday life today. f. The metal use to make engines is iron that is casted in a mold then cooled and removed to make form a block. (Transition: The engine has many internal moving parts each one plays a very important part in the engine design. ) Body: I. Components: A. Injectors/carbs/intake (They supply fuel to the cylinders. ) B. Block/piston/cylinders/rods/crankshaft (They move inside the engine to form and make up the combustion chamber) C.

Valves/camshaft/pushrods/timing chain (They are used in the top end of the engine to control the amount of fuel that enters and exits the combustion chambers) D. Distributor/spark plugs/coil pack (They all hold power housed to create the energy that ignites the fuel. ) (Transition: With all the moving parts they need to be cooled and oiled properly to insure prolonged operation. ) II. Cooling A. Water/antifreeze (the use of a radiator and fans if it is liquid cooled) B. Air cooled (will not have radiator but will most likely have a oil cooler) C.

The water pump and the location of the water passage through the heads. (Transition: Now that we know how the cooling process works we also need to think about how the oil is going to oil all the moving parts. ) III. Oil supply A. types of oil and weights B. where it pumps from and it is contained at C. filtration and life span (Transition: In conclusion there are many components that make up an engine and everyone is important on its own and without one the engine would not run correctly. Conclusion I. Summary A. U need a power and fuel source for a combustion engine to work. B. There two types of engines but both are similar design II. Clincher A. Next time u get in your car, fly on a plain or even just mowing your yard remember it could not be possible without the use of the combustion engine. B. The engine has been around a long time and will be around for many years to come to assisted us in so of our everyday task to make our lives easier

Type of pattern of organization: Topical BIBLIOGRAPHY 1. Internal Combustion Engine library. thinkquest. org/16541/eng/learn/… /int_comb_engine. htm Retrieved on July 22 2011 at 9:35pm 2. Engine Cylinder block materials howautowork. com/part_1/ch_1/Cylinder_block_8. html Retrieved on July 22 2011 at 10:15 2. Interview with master mechanic of 35+ years Scott McCray on July 24 2011 at General motors of Gainesville to discuss the internal workings of an engine. Visual Aids Pictures of a engine

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