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Small Engines
Chapter 4 Vocabulary
| Question | Answer |
|---|---|
| gasoline hydrocarbon fuel refined from petroleum. Mixture of hydrogen and carbon. | |
| petroleum a group of liquid and gaseous compounds composed of carbon and hydrogen, which are removed from the earth. | |
| octane number assigned to gasoline to represent its ability to resist detonation. | |
| atomizing gasoline must be broken up into tiny droplets and mixed with air to produce rapid burning. | |
| cylinder block the largest single part of an engine. The basic or main mass of metal in which the cylinders are bored or placed. | |
| cooling fins located on the outside of cylinder and cylinder head on air-cooled engines and engineered for efficient air circulation and heat control. | |
| crankshaft the main shaft of an engine that, working with the connecting rods, changes the reciprocating motion of the pistons into rotary motion. | |
| crankcase the housing for the crankshaft and other related internal parts. | |
| casting pouring molten metal into a form of a desired shape. | |
| piston a cylindrical part that is closed at one end and connected to the crankshaft by the connecting rod. The force of the explosion pushes the piston. | |
| piston rings an expanding ring placed in the grooves of the piston to seal it against the passage of fluid or gas. | |
| piston pin the journal for the bearing in the small end of an engine connecting rod. Pin also passes through the piston walls. | |
| wrist pin same definition as piston pin. | |
| connecting rod rod that connects the piston to the crankshaft. | |
| ports the openings in the cylinder block for valves, exhaust and inlet pipes, or water connections. In two-cycle engines, the openings for inlet and exhaust purposes. | |
| poppet valves a valve structure consisting of a circular head with an elongated stem attached in the center. Designed to open annd close a circular hole or port. | |
| valve guide a machined hole in the engine block through which the valve stem passes that helps align the valve. | |
| valve spring a spring attached to a valve to return it to the seat after it has been released from the lifting or opening operation. | |
| camshaft shaft containing lobes or cams that operate engine valves. | |
| valve lifter a rod or plunger that transfers motion from the cam and the other valve train components. | |
| flywheel a heavy wheel in which energy is absorbed and stored by means of momentum. |
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fairfld61
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