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Mechanics
Chpt. 12 engine design classifications
| Question | Answer |
|---|---|
| 12 Normally, car and truck engines have how many cylinders? | 4, 6 0r 8 |
| 12 A greater number of cylinders decreases or increases engine smoothness and power? | increases |
| 12 Define cylinder arrangement. | refers to the positionof the cylinders in relation to the crankshaft. |
| 12 Name the five basic cylinder arrangements. | Inline, V-type, opposed, and W-type |
| Why do engine manufactorers number each engine cylinder? | to help technicians make repairs |
| Where are cylinder numbers stamped on? | connecting rods or intake manifold |
| Explain how a liquid cooking system operates. | the cooling system surrounds the cylinder with coolant, then the coolant carries combustion heat out of the cylinder head and engine block to prevent engine damage. |
| Air or air-oil cooled engines are seldom used in what kind of vehicle? | passenger cars |
| Name three types of fuel used in automotive engines | gasoline, diesel fuel, liquefied pertroleum gas, gashol, and alcohol |
| What are the two most common fuels for vehicles? | gasoline and diesel |
| Gasoline engines use a compression or spark ignition? | spark |
| A L-head engine has two kinds of valves. Name them. | Intake and exhaust |
| Where are the two valves in a L-head engine located? | cylinder head |
| Name the two basic locations for the engine camshaft? | block and cylinder head |
| What arrangement is frequently used in engines equipped with four-valve combustion chambers concerning camshafts? | dual overhead cam |
| List the three types of combustion chamber designs. | pancake, wedge, hemispherical, pent-roof |
| Which combustion chamber design has valve heads that are almost parallel to the top of the piston? | pancake |
| Which cam has one camshaft per cylinder head? | single overhead cam |
| Which combustion chamber design has the spark plug located near the center/ | Hemispherical |
| What does the extra valves in a four-valve chamber do? | increase flow in and out of the chamber |
| Describe the operation of a stratified charge combustion chamber. | uses a small combustion chamber flame to ignite and burn the fuel inthe main large combustion chamber |
| A three-valve combustion chamber has how many intake valve(s) and how many exhaust valve(s)? | two intake and one exhaust |
| What type of combustion chamber has a single-chamber fitted with an extra air valve? | air jet |
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