How Horsepower Is Measured In Cars

Torque and horsepower are both ways of understanding force where torque describes the capacity of a force to twist an object and horsepower describes that capacity over time. We'll examine how horsepower improves a car's ability to perform "work," and how an engineer uses a dynamometer to measure horsepower and torque curves.

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How Horsepower is Measured In Cars

[deepakthapa]

suddenly business insider has so much interest in cars

[Griscly]

You forgot to mention how stickers add 100hp each.

[lemon]

You guys forgot to mention the racing seats add +50 horsepower.

[charliemartinez]

“This car is spinning at 8, 000 RPM “, ,

not a good start

[Leo-xerf]

Short answer: it is measured by how many horses can pull the car for 10 meters

Long answer: the video

[chichan]

Okay... So what's that in Camelpower?

[krystalissoojung]

thank you, business insider, for providing me with the knowledge that I never knew I needed, nor questioning it and present it in a very informative, easy to understand and interesting way

[NoobzWarrior]

For mustangs, horsepower is how fast you will hit the wall, and torque is how many people you will drag with you.

[realRickSanchez]

4:24 ...(HP and torque) those number are the best one we have for telling how capable a car really is.
0-60: Am I a joke to you?

[kaiserkonig]

"Those numbers are still the best ones we've got to tell how capable a car is" 4:23. Just look up 0-60 and 1/4 mile times, there are a lot of better ways of looking into a car's performance.

[the_gerb]

As a car guy I can speak for all car guys and say thank you for explaining things that matter to us to other people. But you forgot a few things like that some other manufacturers hp and lb-ft are measured at the crankshaft rather than the wheels. Let’s say that 707hp Dodge Challenger hellcat you showed actually has about 650 to the wheels. Basically wheel hp is just crank hp after taxes. But great work on the research

[Shreeramkhosla]

Who is watching this after a minute this video was uploaded.

[ChhanaChhakchhuak]

3:34 Puts on gas pedal, then shows electric car... :D

[nursultantulyakbay]

I always thought you just count the number of tiny horses inside.

[Prae]

Lemme guess, they measure power in watts and divide by 746?

[ConsensusX]

Well, manufacturers usually advertise Brake horsepower (bhp). This is measured at the crankshaft just outside the engine, (with the engine outside the vehicle and no auxiliary components [alternator, water pump, etc..] attached) before the gearbox and drive train.
The Wheel Horsepower (whp) numbers are ALWAYS lower than what's advertised.
The Challenger Demon is advertised at up to 840HP but only puts out around 700HP at the rear wheels.

[pinochet]

Flame decals on the side of the vehicle increases horsepower by 200hp per decal

[alexandrunechifor]

As an engineer, I loathe the fact that they omitted the torque-axis in the last graph. The graph they used had a vertical horsepower line and a horizontal RPM-line. If you're going to plot two lines in one graph, make sure to include the proper axis!!

[abrahammoua]

You don't measure horsepower, you calculate it.

[sobanshahid]

*Me thinking what is horse power in my mind yesterday*
Youtube: Here's a video telling you all about horse power.