Another issue is accurately quantifying the power and torque from a spinning crankshaft. The tool for this task is an engine dynamometer. Eddy current dynamometers use a magnetic field to transfer torque from the spinning crankshaft to a lever arm bearing against a static force gauge known as a load cell spaced a precise distance from the center of the crank.
The perfect engine produces ample torque at low rpm and sustains that output to the redline. The amount of torque produced is directly proportional to the air flowing through the engine.
Large engines pump more air and, therefore, produce more torque. Boosters—superchargers, turbochargers—deliver additional air to help small engines act large. Making up for the ease of injecting the right amount of fuel, engine designers face several difficult tasks. Cooling and lubrication needs are roughly proportional to the power produced. And pumping air into, through, and out of any engine at ultra-high rpm is where engineering becomes an art form.
But what about the greater moral issue confronting mankind in general and car enthusiasts in particular: Which is better? In a baseball game, if torque is analogous to the catcher, then horsepower is the pitcher. New Cars. Buyer's Guide. Type keyword s to search. Today's Top Stories. In Imperial and U. Share this comparison:. If you read this far, you should follow us:.
Diffen LLC, n. Comparison chart Power versus Torque comparison chart Power Torque Definition Power is the rate at which work is done, or energy is transmitted. Torque is the tendency of a force to rotate an object about an axis or fulcrum or pivot.
Just as a force is a push or a pull, a torque can be thought of as a twist. Power physics In physics, power symbol: P is the rate at which work is performed or energy is transmitted, or the amount of energy required or expended for a given unit of time. As a rate of change of work done or the energy of a subsystem, power is: , where P is power, W is work and t is time.
When the rate of energy transfer or work is constant, all of this can be simplified to , where W and E are, respectively, the work done or energy transferred in time t usually measured in seconds. Viewed 14k times. Improve this question. Waffle's Crazy Peanut 8, 7 7 gold badges 36 36 silver badges 74 74 bronze badges.
It seems to me to be a fair question, and duplicates are not always easy to find through the site search. Sometimes the stack exchange community is very rude.
I don't think this question is off-topic. Add a comment. Active Oldest Votes. Improve this answer. In a real sense, pressure is an energy density. Two totally different concepts, not equivalent at all. Pranav Hosangadi Pranav Hosangadi 4, 22 22 silver badges 34 34 bronze badges. Featured on Meta. Now live: A fully responsive profile. Linked
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