Tachometer: What It Is and How It Works

 

Have you ever looked at the dashboard of a car and wondered what all those numbers and dials mean? One of the most important instruments you will find on a car dashboard is the tachometer. In this article, we will explain what a tachometer is and how it works.

What is a Tachometer?

A tachometer is an instrument that measures the rotational speed of an engine's crankshaft. It is usually located on the dashboard of a car, next to the speedometer. The tachometer displays the engine's RPM (revolutions per minute), which indicates how many times the engine's crankshaft is rotating per minute.

Why is a Tachometer Important?

The tachometer is an important instrument because it helps the driver to know when to shift gears. The engine's RPM range varies depending on the type of engine and the type of car, but most engines have a redline, which is the maximum RPM that the engine can safely operate at. When the engine reaches this redline, it can cause serious damage to the engine.

How Does a Tachometer Work?

A tachometer works by measuring the electrical signals produced by the ignition system, which are in turn created by the rotation of the engine's crankshaft. The tachometer uses a small electrical current to generate a magnetic field, which in turn produces a voltage. This voltage is then measured and displayed on the tachometer as RPM.

There are two types of tachometers: mechanical and electronic. Mechanical tachometers use a cable that is driven by the engine's crankshaft. As the cable rotates, it turns a magnet, which produces a voltage that is displayed on the tachometer. Electronic tachometers, on the other hand, use a signal from the engine's computer to display the RPM.

In addition to measuring engine speed, some tachometers also have other features, such as shift lights, which indicate when it's time to shift gears. Some tachometers also have programmable shift points, which allow the driver to set specific RPM ranges for each gear.

Tips for Using a Tachometer

If your car has a tachometer, there are a few tips that can help you use it effectively:

Know your car's RPM range: Every car has a different RPM range, so it's important to know the redline for your specific car. This will help you avoid over-revving the engine and causing damage.

Use the tachometer to shift gears: Shifting gears at the right RPM can help improve your car's performance and fuel efficiency. Generally, it's best to shift gears when the RPM reaches a certain range, depending on the type of car and engine.

Keep an eye on the tachometer when driving: The tachometer can help you monitor the engine's performance and avoid over-revving. It's a good idea to check the tachometer periodically while driving to ensure that you're not exceeding the redline.

The tachometer is an important instrument that helps drivers monitor their engine's performance and avoid damage. By understanding how a tachometer works and using it effectively, you can improve your car's performance and prolong its lifespan. So next time you're behind the wheel, take a moment to check out your car's tachometer and put its valuable information to use.