Chapter 12 PowerPoint

Define these Technical Terms using the textbook:

1. compression ignition engine

2. dual overhead cam (DOHC) engine

3. inline engine

4. rotary engine

5. single overhead cam (SOHC) engine

6. spark ignition engine

7. variable displacement engine

8. variable valve timing engine

9. V-type engine

Answer these discussion questions using the textbook:

1. Compare gasoline and diesel engines. What are the major differences?

Read the chapter summary below:

■ Although basic engine parts are the same, design differences can change how engines operate and how they are repaired.

■ Cylinder arrangement refers to the position of the cylinders in relation to the crankshaft.

■ The liquid cooling system surrounds the cylinder with coolant (water and antifreeze solution).

■ A spark ignition engine uses an electric arc at the spark plug to ignite the fuel.

■ A compression ignition engine squeezes the air in the combustion chamber until it is hot enough to ignite the fuel.

■ A cam-in-block engine uses pushrods to transfer motion to the rocker arms and valves.

■ In an overhead cam (OHC) engine, the camshaft is located in the top of the cylinder head.

■ A four-valve combustion chamber uses two exhaust valves and two intake valves per cylinder.

■ A stratified charge combustion chamber uses a small combustion chamber flame to ignite and burn the fuel in the main combustion chamber.

■ A pre-combustion chamber is commonly used in automotive diesel engines.

■ A variable displacement engine can deactivate cylinders so the engine conserves fuel and produces fewer emissions.

■ A variable valve timing engine can alter valve opening and closing independent of crankshaft rotation.

■ A two-stroke-cycle engine is similar to a four-stroke-cycle engine,but it requires only one revolution of the crankshaft for a complete power-producing cycle.