Power Band
Cruiser
Joined: Oct 2007
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RE: Power Band
ORIGINAL: Phrogman
Q is the matematical abbreviation for Torque.
Also, horsepower is really a measurement of potential to do work, Power is the result of that potential.
ORIGINAL: murphyslaw1978
Hmm, I guess I don't understand. What is Q? When you say "power as in a measurement of the amount of work done per unit of time," that is exactly what the definition of horsepower is.
ORIGINAL: Phrogman
Murphy, I'm definitely not talking about either horsepower or torque. I'm talking "power as in a measurement of the amount of work done per unit of time." Power includes both HP and Q combined to produce the result of the rear wheel turning.
Murphy, I'm definitely not talking about either horsepower or torque. I'm talking "power as in a measurement of the amount of work done per unit of time." Power includes both HP and Q combined to produce the result of the rear wheel turning.
Also, horsepower is really a measurement of potential to do work, Power is the result of that potential.
. But in any event, the discussion of [Horse]power vs. Torque always comes up, in every single forum or mechanics corner, weather it be Porsches, Corvettes, airplane engines, diesel tractor-trailers, etc. What's interesting is that no discussion is complete (or accurrate) unless we also include the transmission. And then I found the absolute best explanation of "[Horse]power vs. Torque. Basically, it goes like this:
"It is better to make Torque at a higher RPM than a lower RPM so that you can make more Horsepower and take advantage of gearing."
I basically means that you need to be able to produce Torque (twisting force of an engine), higher up on the RPM scale ([horse]power) and have the right gearing to keep that torque as high as possible (speed).
Outstanding HDF Member
Joined: Jul 2007
Posts: 2,609
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From: Indy area
RE: Power Band
(horse)power is the result of torque (angular momentum) over time (angular speed).
The reason that they equal one another at 5250 RPM is because that's one of the factors used in the equation that derives horsepower from torque.
It's all about torque in an engine. That's what is behind the power equation/production. (and the symbol for torque is the Greek letter "tau" (t)). The horsepower trace in the dyno stripchart is merely the result of plugging the measured torque into the equation.
"Q" is usually either "quality factor" or "damping factor".
At any rate, at least on my iteration of the 96" TC engine, the usable powerband lower threshold is most definitely very near 2000 RPM, even in the upper gears. Granted, it kicks in a little better around 2500 but that's typically just below my shift point unless I'm really romping on it.
I understand this stuff very well and I know my engine very well. I don't ever lug it.
The reason that they equal one another at 5250 RPM is because that's one of the factors used in the equation that derives horsepower from torque.
It's all about torque in an engine. That's what is behind the power equation/production. (and the symbol for torque is the Greek letter "tau" (t)). The horsepower trace in the dyno stripchart is merely the result of plugging the measured torque into the equation.
"Q" is usually either "quality factor" or "damping factor".
At any rate, at least on my iteration of the 96" TC engine, the usable powerband lower threshold is most definitely very near 2000 RPM, even in the upper gears. Granted, it kicks in a little better around 2500 but that's typically just below my shift point unless I'm really romping on it.
I understand this stuff very well and I know my engine very well. I don't ever lug it.
Elite HDF Member
Joined: Mar 2006
Posts: 4,722
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From: Biddeford, Maine
RE: Power Band
I know where mine is............2500-6200.
I keep mine right around 2500-3000 at all times when just cruising, and when I'm feeling frisky the redline is the limit.
Steve
I keep mine right around 2500-3000 at all times when just cruising, and when I'm feeling frisky the redline is the limit.
Steve
Tourer
Joined: Jul 2007
Posts: 351
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From:
RE: Power Band
2500-3300 except in ist or 2nd. At 3000 rpm in 6th gear, I'm going 80 MPH. Not much need to go any faster than that 99% of the time. Have spent a little time over the century mark and the bike had plenty of throttle left.
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[IMG]local://upfiles/36447/09FD3FAD010B41C38C2B530AAF78748E.jpg[/IMG]
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