# How do you calculate engine loss?

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## How is drivetrain loss calculated?

Two parts to this – first we take the wheel horsepower figure (WHP) that the car has made on the dyno. BHP-WHP= Horsepower Loss. We then divide HP loss by BHP and multiply by 100 to get our drivetrain loss percentage.

## How is flywheel HP calculated?

The equation to calculate horsepower is simple: Horsepower = Torque x RPM / 5,252.

## Is WHP the same as HP?

WHP – Wheel horse power is a measure of the actual amount of power that makes it to the ground (dyno). HP – Horse Power is an insignificant term. Manufacturers almost always tell you crank horsepower – the power that the engine makes with accessories, but not including drivetrain losses.

## How much power do you lose from engine to wheels?

Broadly, 15 per cent of the engine’s peak power is lost to friction, getting to to the wheels from the crank. So 300 kilowatts/horsepower (whatever) at the crank is about 250 at the wheels (ballpark estimate). But manufacturers all measure power at the crank.

## How do you reduce drivetrain loss?

Mods to reduce drivetrain power loss?

1. Lightweight driveshaft (leaning toward CF to reduce rattling, ~9lbs lighter than stock)
2. Lightweight wheels/tires (TWS T66-F 17inch and Dunlop SportMaxx RT, should reduce about 9lbs per wheels compared to stock)
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## What is the drivetrain on a vehicle?

A car’s drivetrain connects the engine to the wheels enabling the vehicle to move. … The drive wheels can be either the front wheels, rear wheels, or all the wheels — also known as front-wheel, rear-wheel, and all-wheel drive.

## What is drivetrain loss?

Drivetrain horsepower loss is the loss of horsepower between the engine (flywheel) and the wheels due to (mostly) friction. It takes some power to turn transmission gears, transfer case, driveshaft, axles, etc. – before the power gets to the ground (wheels).

## Why is it called horsepower?

When the steam engine began to do the work of horses in the mines during the early 1800s, the mine owners began to ask how many horses an engine would replace. James Watt, who invented steam engines, figured out a mathematical way to equate horses to engine power. Thus the term horsepower was invented.

## How many watts are in a horsepower?

Two common definitions used today are the mechanical horsepower (or imperial horsepower), which is about 745.7 watts and the metric horsepower, which is approximately 735.5 watts.

## What are the 2 main types of losses in a motor?

There are two main kinds of losses in electric motors, which are often referred to as iron losses and copper losses. Dealing first with iron losses, these are made up of two ‘components’, namely eddy current losses and hysteresis losses.

## Where is energy lost in an engine?

In gasoline-powered vehicles, most of the fuel’s energy is lost in the engine, primarily as heat. Smaller amounts of energy are lost through engine friction, pumping air into and out of the engine, and combustion inefficiency.

## Which cycle is more efficient?

Explanation: Otto cycle is more efficient than Diesel cycle for a given compression ratio. 6. For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order.