Power Band
Elite HDF Member
Joined: Oct 2006
Posts: 3,945
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From:
RE: Power Band
Yessir, ah agree with you. Especially on the bikes w/o tachs - it's a guessin' game for 'em as to rpm, an' luggin' the engine definitely creates a LOTTA noise!
One thang, though - we ain't the onliest state in the union....but we ARE the smartest!!
One thang, though - we ain't the onliest state in the union....but we ARE the smartest!!
Road Master
Joined: Oct 2007
Posts: 781
Likes: 1
From: Cave Creek, AZ
RE: Power Band
I always thought that it's not just hp or torque alone, but rather a combination of the two that represents the "powerband" of a given engine. Peak acceleration will occur at peak torque, whereas peak hp simply represents the maximum amount of work the engine can produce. Torque accelerates the bike and hp (once you're in the proper gear) will dictate your top speed.
What we "feel" as power is really the torque the engine is making.
What we "feel" as power is really the torque the engine is making.
Cruiser
Joined: Oct 2007
Posts: 195
Likes: 1
From:
RE: Power Band
ORIGINAL: Phrogman
Murphy, what I'm talking about is therange of rpms where you see the most power output. Typically on a dyno chart this is a gradual curve from one rpm to another until as you state you start to drop off dramatically. I'm not talking about absolute highest output but rather the entire usable band.
Murphy, what I'm talking about is therange of rpms where you see the most power output. Typically on a dyno chart this is a gradual curve from one rpm to another until as you state you start to drop off dramatically. I'm not talking about absolute highest output but rather the entire usable band.
Since the engine will make torque way down low, the only question is "what is safe?" I mean there are low-oil-pressure issues, pre-detonation, piston-slap and all those things associated with lugging an engine.
Cruiser
Joined: Oct 2007
Posts: 195
Likes: 1
From:
RE: Power Band
ORIGINAL: Phrogman
I just think that with all these posts about people lugging their motors/not lugging their motors maybe they really don't understand how and when power is produced in a gasoline engine.
I just think that with all these posts about people lugging their motors/not lugging their motors maybe they really don't understand how and when power is produced in a gasoline engine.
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Road Warrior
Joined: Nov 2006
Posts: 1,699
Likes: 2
From: Deltona, FL
RE: Power Band
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.
Elite HDF Member
Joined: Jul 2007
Posts: 4,749
Likes: 16
From: sand mountain Alabama
RE: Power Band
I have a 07 ultra with a 96ci stage 1. It starts to pull hard from 2,500-2,800 rpms starts to fade some around 4,000 but this is the seat of the pants dyno. I agree with staying around 2,500 rpms. I do not use 6th unless I am turning 2,800 rpms. Way to many hils around here. My mpg drops if I do not stay above 2,800 rpms in 6th.
Cruiser
Joined: Oct 2007
Posts: 195
Likes: 1
From:
RE: Power Band
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.
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Road Warrior
Joined: Nov 2006
Posts: 1,699
Likes: 2
From: Deltona, FL
RE: Power Band
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.
Road Warrior
Joined: Sep 2007
Posts: 1,314
Likes: 5
RE: Power Band
My 08 Ultra only has about 800 miles on it, but it seems to me to pull real good up to redline. I don't take it there very often, but it definitely does not hurt the engine to hit that line once in awhile. My normal riding style has me running much closer to 3000 rpm than 2000 execept for around town. I like the feel of the 2800 area, I know that if I twist the throttle I've got immediate power to get me out of trouble and have engine braking available by just letting off the throttle. I've only had my bike in 6th a couple of times, but that is usually when cruising 75-80 on the slab. I think this 96 ci engine runs better than the 88 in my Dyna when the rpms are kept up, the Dyna was much more forgiving if you missed a shift and found yourself in a higher gear than you expected.