| Term | Definition |
|---|
| are raised portions of a shaft that have high spots called lobes | cam |
| space between the top of the piston and the cylinder head...an enclosed area in which the fuel and air mixture is burned | combustion chamber |
| the distance from the crakshaft's main bearing centerline to the crankshaft throw center line...the "stroke" of an engine is twice the crank throw | crank throw |
| noise that is caused by abnormal engine combustion...most noticeable during acceleration | detonation |
| similar in many respects to a gasoline engine, EXCEPT; do not contain an ignition system...instead of using a spark plug for ignition it uses the heat produced by compressing air in the combustion chamber to ignite the fuel | diesel |
| A double overhead camshaft valve train layout is characterized by two camshafts located within the cylinder head, one operating the inlet valves and one operating the exhaust valves. | dual overhead camshaft (DOHC) |
| The firing order is the sequence of power delivery of each cylinder in a multi-cylinder reciprocating engine. This is achieved by sparking of the spark plugs in a gasoline engine in the correct order, or by the sequence of fuel injection in a Diesel engine. | firing order |
| used to warm the combustion chamber when the engine is cold. Cold starting is impossible with out these plugs | glow plug |
| a vehicle that uses more than one energy source to move the vehicle. (ex. an electric motor and a gasoline engine) | hybrid vehicle |
| high spots that are located on cams...as the camshaft rotates the lobes rotate and lift the valve open by pushing it away form its seat. Once the camlobe rotates out of the way the valve, forced by a spring, closes | lobe |
| type of engine battery that is used in hybrid vehicles. Is capable of being re-charged through the action of the motor | nickel metal hydride (NiMH) |
| also has intake and exhaust valves located in the cylinder head, but the cam is also located in the cylinder head...here the valves are operated directly by the camshaft or thru cam followers or tappets | overhead camshaft (OHC) |
| the intake and exhaust valves are mounted in the cylinder head and are operated by a camshaft located in the cylinder block...this arrangement requires the use of valve lifters, pushrods and rocker arms to transfer camshaft rotation to valve movement | overhead valve (OHV) |
| type of engine that offers the opportunity to fit larger valves in the combustion chamber and use longer connecting rods which means that they are capable of running at higher engine speeds...because of this the tend to be larger than undersquare engines | oversquare |
| noise that is most noticeable during acceleration with the engine under load and running at normal temperature | ping |
| somewhat similar to the standard piston engine EXCEPT; it uses a rotating motion rather than a reciprocating motion. In addition it uses ports rather than valves for controlling the intake of the air/fuel mixture and the exhaust. a.k.a. "Wankel engine" | rotary engine |
| transmitted through the drivetrain to turn the driving wheels of the vehicle | torque |
| type of engine that has short connecting rods that aid in the production of more power at lower engine speeds | undersquare |
| somewhat similar to the standard piston engine EXCEPT; it uses a rotating motion rather than a reciprocating motion. In addition it uses ports rather than valves for controlling the intake of the air/fuel mixture and the exhaust. a.k.a. "rotary engine" | wankel engine |
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