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Definitions (63)
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steering geometry
The related angles made by the front wheels when the vehicle is negotiating a turn. Sometimes used to describe the various angles made by the components of the front wheel turning arrangement, such as [..]
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toe angle
Toe angle is the direction in which the front wheels of the car are pointed. When both front wheels are parallel there is 0 degrees toe. When the front of the wheels is pointed inward, there is a posi [..]
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valve lift
The distance a valve moves off the face of the valve seat. This can be measured in inches or millimeters.
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a/r ratio
The ratio between the cross-sectional area (A) of the turbine scroll of a turbocharger at any one point and the distance or radius (R) from that point to the center of the turbine-wheel. This ratio is [..]
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air/fuel ratio
The ratio of air to fuel in the air/fuel mixture. In the internal combustion engine, the ideal air/fuel ratio is 14,7:1, which is referred to as the Stoichiometric Condition. This ratio provides the i [..]
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anti-reversion
An attempt to inhibit reversion, i.e., an attempt to restrict the flow of exhaust gasses back into the combustion cylinder. Also see Reversion.
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back pressure
A restriction in the flow of exhaust gasses caused by the exhaust system or by a turbocharger but is ultimately required of efficient scavenging of the exhaust gasses in the combustion chamber.
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balance shaft
A shaft designed to reduce engine vibration by rotating in the opposite to the crankshaft. This complicates crankshaft and conecting rod modifictions, such as lightening and stroking, slightly as the [..]
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blower
Used to refer to a supercharger. Technically, a blower is supercharger that does not have internal compression. The term has become interchangeable with the term "supercharger" but refers sp [..]
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bottom dead center
The point in the rotation of the crankshaft at which the piston is at its lowest point in the cylinder. This lasts for a few degrees of crankshaft rotation. The kinetic energy of the fly wheel helps t [..]
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