What is the difference between flywheel horsepower and wheel horsepower?

Question

What is the difference between flywheel horsepower and wheel horsepower

Answer 1

Fly wheel HP is the horse power put out directly by the engine only. Wheel hp is the hp put out at the actual wheels that are driven by the engine and takes the gearing down of the engine into consideration~~

Answer 2

Flywheel Horsepower

Answer 3

There are mainly two ways to measure horsepower; at the drive wheels or at the flywheel of the engine. It's much easier on a chassis dynomometer IF the engine is IN your car, but if the engine is out of the car AND you have access to a dyno stand then that's a lot more fun (and expensive).

Answer 4

Flywheel HP is without any parasitic drains. It's the true HP rating of the motor.

Wheel HP is what is measured at the wheels, and the difference between the two is the parasitic loss through gearing, etc.

Answer 5

Horsepower at the wheels equals flywheel horsepower minus losses thru the vehicle drive trane, (transmission, differential, bearings: friction and inertial losses).

Answer 6

one is measured at the engine, the other is where the rubber meets the road. Your transmission, torque converter ,driveline and differential all are hosts of potential power losses.In addition, when comparing "dyno" horsepower to wheel horsepower, you also lose power through your alternator,a/c ,power steering and non-electric fans and a more restrictive exhaust and emission package.

Answer 7

Measured at the flywheel vs. measured at the wheel

Answer 8

Power to the rear wheels is hard to explain.
It is based on engine torque to clutch surface to transmission gearing to rear axle ratio to wheel size to tire size to tire material to road surface.
There are test machines to measure "horse power at the rear wheels". We used to measure it by how much rubber we left on the street.
And your term "flywheel HP" is most likely measured as "torque to a bench dynamo". Aha, like - measuring the power of at engine drive shaft.

Answer 9

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horsepower via flywheel is like getting a reading without a load. rear wheel to me is more realistic because it's under load (rest of car and weight).