Redlines vary anywhere from a few hundred revolutions per minute (rpm) (in very large engines such as those in trains and generators) to more than 10,000 rpm (in smaller, usually high-performance engines such as motorcycles, some sports cars, and pistonless rotary engines). As long as the G-forces acting on the piston-connecting rod assembly multiplied by their own mass is less than the compressive and tensile strengths of the materials they are constructed from and as long as it does not exceed the bearing load limits, the engine can safely rev without succumbing to physical or structural failure. The piston acceleration is directly proportional to the magnitude of the G-forces experienced by the piston-connecting rod assembly. The acceleration, or rate of change in piston velocity, is the limiting factor. Straying into this area usually does not mean instant engine failure, but may increase the chances of damaging the engine. Operating an engine in this area is known as redlining. 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. The word is also used as a verb, meaning to ride or drive an automotive vehicle above the redline. The redline of an engine depends on various factors such as stroke, mass of the components, displacement, composition of components, and balance of components. 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. Tachometer showing red lines above 14,000 rpm. ( Learn how and when to remove this template message)
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