Revving an internal combustion engine to its maximum speed
This article is about engine speed. For other uses, see Redline (disambiguation).
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Tachometer showing red lines above 14,000 rpm.
Redline refers to the maximum engine speed at which an internal combustion engine or traction motor and its components are designed to operate without causing damage to the components themselves or other parts of the engine.[1] The redline of an engine depends on various factors such as stroke, mass of the components, displacement, composition of components, and balance of components.
The word is also used as a verb, meaning to ride or drive an automotive vehicle above the redline. The actual term redline comes from the red bars that are displayed on tachometers in cars starting at the rpm that denotes the redline for the specific engine. Operating an engine in this area is known as redlining. Straying into this area usually does not mean instant engine failure, but may increase the chances of damaging the engine.
^"Glossary of Car Terms". caranddriver.com. 15 June 2009.
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