Informative Speech Outline

Topics: Internal combustion engine, Engine displacement, Cylinder head Pages: 3 (642 words) Published: August 2, 2011
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.

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.)

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...
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