Free set of valve stem caps to the person who can explain...
10-26-2009, 07:24 AM
#83
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Torque is twisting force. Horsepower is the multiplication of that force by how many times the engine goes around in a minute (rpm, duh).
Think of lifting a weight. If you lift a 20 lb dumbbell 1 foot, that's 1 ft-lb.
Doing it once isn't much work. Doing it 30 times per minute is a lot of work. HP measure work. That's 30 ft-lbs per minute. 1 HP is about 33000 lb-ft per minute ( from rough memory). Its also about 750 watts.
G
Think of lifting a weight. If you lift a 20 lb dumbbell 1 foot, that's 1 ft-lb.
Doing it once isn't much work. Doing it 30 times per minute is a lot of work. HP measure work. That's 30 ft-lbs per minute. 1 HP is about 33000 lb-ft per minute ( from rough memory). Its also about 750 watts.
G
10-26-2009, 11:07 AM
#84
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forest and trees problem. For simplicity - the 5252 part simply comes from two numbers:
1. the constant used in the definition of a HP - 33,000 lb-ft/min
2. two Pi - 6.28
33k/6.283 ~ 5252
absent that calculation, you have a very valid measure of power. But in bazaar units, rather than HP
G
1. the constant used in the definition of a HP - 33,000 lb-ft/min
2. two Pi - 6.28
33k/6.283 ~ 5252
absent that calculation, you have a very valid measure of power. But in bazaar units, rather than HP
G
Last edited by Just Me; 10-26-2009 at 04:20 PM.
10-31-2009, 11:38 PM
#87
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Misconception
Everyone is missing the rpm factor. What matters is the shape of the power curve over the rpm range. Torque really doesn't matter, it' just a derived calculation.
If you produce 100 hp at 1000 rpm and maintain that up to 10,000 rpm you will go faster than if you produce 500 hp peak at 10,000 rpm but below 100 hp between say 1000 rpm and 7000 rpm.
If you produce 100 hp at 1000 rpm and maintain that up to 10,000 rpm you will go faster than if you produce 500 hp peak at 10,000 rpm but below 100 hp between say 1000 rpm and 7000 rpm.
11-02-2009, 08:13 AM
#88
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Of course, comparing the numbers mean nothing if the measurements weren't taken at the same points in the two (or more) vehicles.
For instance, one bike company measures their figures at the rear axle. Another measures theirs at the front sprocket where is comes out of the engine and drives the belt/chain to the rear sprocket.
Also, the figures themselves mean nothing unless you are aware of the mass involved that you are trying to affect. Torque/hp 'x' will move mass 'y' at certain rates. The same numbers will move mass 'z' at other rates.
For instance, one bike company measures their figures at the rear axle. Another measures theirs at the front sprocket where is comes out of the engine and drives the belt/chain to the rear sprocket.
Also, the figures themselves mean nothing unless you are aware of the mass involved that you are trying to affect. Torque/hp 'x' will move mass 'y' at certain rates. The same numbers will move mass 'z' at other rates.
11-03-2009, 07:03 AM
#90
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not really. Torque has no rpm componnet to its definition. RPM allows for higher power at a higher speed, which, via a gearbox, can have torque multiplication applied. But it still result sin more torque ( e.g.: in lower gears)
Grant
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