Tachometers To The Red Line And Beyond
Below is a MRR and PLR article in category Vehicles -> subcategory Trucks-SUVS.
Tachometers to the Red Line and Beyond
Overview
A tachometer measures the speed of a rotating object, such as a circular plate or shaft. The term originates from Greek words for "speed" (tachos) and "measure" (metron).
Purpose and History
Initially, tachometers were used to measure centrifugal force. They have since evolved to become essential for gauging engine speed in vehicles. German engineer Dietrich Uhlhorn is credited with inventing the tachometer, driven by his interest in machine speed. By 1940, tachometers were commonly used in locomotives and are now used in light rail systems as well.
Evolution
Early tachometers were mechanical devices. Today, they are electronic, integrated into computerized systems. In older vehicles, tachometer readings in revolutions per minute (RPM) were taken from the ignition coil's low tension side. Diesel engines, lacking ignition systems, gauged speed through alternator output voltage. Despite these methods not measuring direct engine revolutions, they effectively captured engine activity.
Functionality and Usage
Originally, tachometers indicated safe engine operating ranges. "Redlining" an engine referred to running it at dangerously high speeds, risking wear and damage. Despite potential damage, the sound of an engine revving often enticed racing.
Modern Innovations
In contemporary engines, a rev limiter protects the engine by preventing speeds beyond safe limits.
For further details, visit [Tachometer World](http://www.tachometerworld.info).
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