What is Torque? Everything You Need to Know

Have you ever wondered why sports cars can sprint out in the blink of an eye, while heavy trucks seem to struggle when going uphill?

The key lies in a "rotational force" hidden deep inside the engine - Torque.

But what is torque? Why is this invisible force so critical to vehicles? Let's delve into this interesting concept of torque in this article.

What is torque?

Have you ever tried to twist a bottle cap? When you twist a bottle cap with your hands, you are applying torque. So from a real-life example, torque is a force that causes an object to rotate.

Here’s the definition of a torque from a technical perspective: force multiplied by the length of the moment arm. In other words, the more force you apply to a point, or the farther that point is from the center of rotation, the greater the torque.

Here’s a simple mathematical definition of torque:

Torque = force × moment arm

T = F × r

So if you use more force, or a longer tool (like a wrench), it’s easier to turn a tight screw. That’s what torque movement looks like—an object starts to rotate under the action of torque.

What is engine torque?

Simply put, engine torque is the twisting force generated by the car engine. It is the force behind the engine power, driving the crankshaft to rotate and ultimately driving the vehicle forward.

What does torque affect?

• Acceleration ability: The greater the torque, the faster the car starts, especially at low speeds.
• Load capacity: Trucks, large trucks, etc. need large torque to pull heavy objects.
• Off-road performance: Off-road vehicles rely on strong torque when climbing hills.

In other words, torque is the "rotational force" transmitted by the engine to the wheels. It determines whether you can get ahead when starting at a traffic light, and whether you can easily cope with going up a mountain road.

How does torque work in a vehicle?

All engines produce a certain amount of horsepower and torque. The two are related and express the engine's power output in different ways. Torque is even used to calculate the engine's horsepower.

In an everyday car or truck, the engine is typically capable of about 100 to 400 pound-feet of torque. This force comes from the movement of the pistons inside the engine: the pistons move up and down, pushing the crankshaft to generate a rotational force, or torque. This rotational power is then transferred through the transmission and drivetrain to the wheels, driving the vehicle forward.

Generally speaking, engines with higher torque are better at carrying heavy loads, such as towing a trailer, climbing a hill, etc.

How to increase torque?

Many car owners are concerned about how do you increase torque? " or "how to gain torque?

Here are some common methods:

1. Upgrade the intake system

Improving the engine's air intake efficiency and providing more air will help improve combustion efficiency and torque output.

2. Install a turbocharger

The turbocharger will press more air into the combustion chamber, thereby improving the efficiency and power output of the internal combustion engine. The turbocharger can also increase the engine's horsepower, which is a necessary condition for increasing torque.

3. Use high-quality fuel and oil

Good fuel has a higher knock value, and high-quality oil reduces internal friction, thereby improving engine efficiency and output.

4. Replace the high-performance exhaust system

Reduce exhaust resistance, increase air flow speed, and thus improve torque performance.

How to read the torque curve?

You may see information such as "maximum torque 250N·m/1800-4000rpm" in the technical parameters of the car.

• Maximum torque value: indicates the "maximum power" of the car.
• Speedrange: indicates the speed range in which this power can be output.

If a car can output higher torque at a lower speed, it means that its daily driving will be easier and more responsive.

Summary

Now that you understand everything about torque, the next time you feel the surging power of a car engine, remember the unsung hero behind it all: Torque.

FAQ

1. Is the greater the torque, the better?

Not entirely. A large torque is good for starting and climbing, but it also means greater fuel consumption. For small commuter vehicles, a moderate torque is more suitable.

2. What are the different effects of torque on automatic and manual transmissions?

Automatic transmission vehicles rely on the gearbox to adjust the speed range, and a large torque can make gear shifting smoother. Manual transmissions can feel the "explosive power" of torque output more.

3. Do electric vehicles also talk about torque?

Of course! The biggest advantage of electric motors is "maximum torque at the start", which is one of the reasons why electric vehicles start quickly and accelerate violently.