You notice this every time you get into your car – when you start the engine, an indicator called the tachometer shows the revs. But especially if you don’t have a manual transmission, you may not fully understand what it’s about, why it’s vital, and you’re too embarrassed to ask about it. Don’t worry, we’ll explain it to you in this video.
Transcription: What does RPM mean? RPM stands for “revolutions per minute”. This is a measure of engine speed. Generally speaking, the faster the engine rotates, the more power it produces. The engine works by burning air and gas to push the pistons down. This force causes the crankshaft to rotate, which ultimately drives the car’s wheels. The force transmitted to the crankshaft is called torque. Power is a measure of work done in a given period of time.
At higher revs, the engine burns more air and fuel. This means it produces more power and uses more gas. The tachometer usually displays rpm in thousands. So if the tachometer shows the number “2”, it is rotating at 2000 revolutions per minute. Drivers with a manual transmission operate the tachometer as a reference point when changing gear. Insufficient RPM may cause the engine to stall. Too much can damage the engine.
The engine rev limit is displayed on the tachometer as a red area called the “red line”. Exceeding this limit may result in earnest engine damage. Generally, shifting at lower revs is most effective. Every car is different, but your owner’s manual may provide guidance on effective shift points.
