WHY BHP AND NOT HP

Brake Horsepower (BHP) vs. Horsepower (HP)

When it comes to measuring the power of an engine, two terms are often used interchangeably: brake horsepower (BHP) and horsepower (HP). However, there is a subtle but important distinction between the two. BHP is the measure of an engine's power output at the crankshaft, while HP is the measure of an engine's power output at the wheels.

Why BHP is More Important Than HP

There are a few reasons why BHP is a more important measure of engine power than HP. First, BHP is a more accurate measure of an engine's true power output. This is because BHP measures the power output of the engine itself, while HP measures the power output of the engine after it has been transmitted through the drivetrain. As a result, BHP is not affected by factors such as friction and drivetrain losses, which can reduce the amount of power that is actually delivered to the wheels. Think of it like this, if you have two cars with the same horsepower, the car with the higher BHP will be faster because it has less power loss through the drivetrain.

Second, BHP is a more consistent measure of engine power than HP. This is because BHP is not affected by changes in atmospheric conditions, such as temperature and humidity. HP, on the other hand, can be affected by these conditions, which can make it difficult to compare the power output of different engines under different conditions.

When HP is More Important Than BHP

There are a few situations in which HP may be a more important measure of engine power than BHP. For example, if you are comparing the performance of two vehicles that have the same BHP but different drivetrains, the vehicle with the more efficient drivetrain will have a higher HP rating. This is because the more efficient drivetrain will lose less power through friction and drivetrain losses.

How to Measure BHP and HP

BHP and HP can be measured using a dynamometer. A dynamometer is a device that measures the torque and speed of an engine's output shaft. Once the torque and speed are known, the BHP and HP can be calculated.

Conclusion

So, which is more important, BHP or HP? In most cases, BHP is a more important measure of engine power than HP. This is because BHP is a more accurate, consistent, and reliable measure of an engine's true power output.

Frequently Asked Questions

1. What is the difference between BHP and HP?

BHP is the measure of an engine's power output at the crankshaft, while HP is the measure of an engine's power output at the wheels.

2. Why is BHP more important than HP?

BHP is a more accurate, consistent, and reliable measure of an engine's true power output.

3. When is HP more important than BHP?

HP may be more important than BHP when comparing the performance of two vehicles that have the same BHP but different drivetrains.

4. How can I measure BHP and HP?

BHP and HP can be measured using a dynamometer.

5. What are some factors that can affect BHP and HP?

Factors that can affect BHP and HP include engine design, displacement, compression ratio, and camshaft profile.