06-16-2024, 04:44 PM | #17 | |
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Quote:
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06-16-2024, 04:52 PM | #18 |
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Location: Northern Vermont, USA
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[QUOTE=Megadan;409536]Gearing does change the amount of torque at the rear wheel. That's what gear ratios do, divide rpm and multiply torque. Horsepower doesn't change because it is a function of rpm and torque. Changing gear ratios just alters the relationship between those two on their side of the equation.[/QUOTES
Sure, but we don't know that gearing is the issue here as we don't have information about the rpm he is hitting where he is looking for "more power". If he is currently turning 8000 rpm at 25mph, raising the gear ratio is going to move him even MORE out of the peak torque band. It sounds like the OP is looking for an easy answer to give his bike "more power", and gearing isn't that answer.
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06-16-2024, 05:21 PM | #19 |
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I guess OP will find out. He will have more torque in the conditions he describes. I guess that is what he wants.
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06-16-2024, 08:11 PM | #20 | |
Join Date: Aug 2013
Location: FL
Posts: 357
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Quote:
but yeah, 2-3 down on the front, and 3-4 up on the rear cause you to have nearly the same chain length setting on the adjusters. An ethernet cable can handle blinkers and data/sensor wires just fine, provided they are LED lights. Might even run a tail light. I wouldn't use it for break or headlights, unless you plan on using multiple wires. I think each wire handles about 1 amp, equals about 12W. The LED blinkers are about 5W, or half the maximum capacity of the wire. You can also reuse some of the wires on the harness. Like the ground wire. The ground wire on the blinkers and tail light are all the same. If you disconnect the ground wire on the tail light or blinkers, and disconnect it at the other end as well, it'll free up a wire on the harness for other purposes. The tail and blinker lights can easily be grounded to the body of the bike, or to another ground point. I'd rather do this, than replace an entire wire harness, for a few faulty wires. |
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06-16-2024, 08:20 PM | #21 | |
Join Date: Aug 2013
Location: FL
Posts: 357
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Quote:
Gears have everything to do with harvesting max torque or HP out of an engine, and have absolutely everything to do with this topic. I don't see anything I've written out of line with the conversation. Just merely responding to an incorrect assumption on your part. You think everything is math,but your math ain't mathing, if you agree that gears change torque without changing HP. The formulas you're using aren't applicable to gearing, but just to engine testing. Once you add gearing to the equation, engine output and HP ratios change. It's just a fact. |
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06-16-2024, 09:09 PM | #22 |
Join Date: Aug 2020
Location: Australia
Posts: 1,434
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Oh boy, its going to be one of those...
We are not changing the crank and rod inside the engine to implicate the known engine out put. Or changing the internal gearing at the output shaft... The HP an torque of the engine is what it is. Changing sprockets, wheel diameters, overall weight and chain type/length will merely shift the output dynamics. |
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06-16-2024, 11:03 PM | #23 | |
Join Date: Aug 2013
Location: FL
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Quote:
Changing gearing changes the load on the engine. Engine ratings are done at a fixed load, and thus the rating of any dyno is fixed. Increase the load, increases the efficiency, and thus also the HP output. Try reading a dyno in 4th gear, and in 6th gear. You'll understand what I'm talking about about. |
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06-17-2024, 12:17 PM | #24 | |
Join Date: May 2013
Location: finger lakes NY
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Quote:
Take a drag car, if you put a 2.22:1 gear in the rear end, its not going to accelerate (percieved torque) near as fast as a 4.60:1, or a 5.72:1 rear end. Has the engine output changed? Nope... has the acceleration changed, causing a percieved torque shift, absolutely... |
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06-18-2024, 08:41 AM | #25 |
Join Date: Oct 2021
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I remember something like this coming up with a seemingly simple question I asked in my first days here. After getting very confused with what I was reading, I looked around this forum and realized... Megadan is probably right.
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06-18-2024, 03:18 PM | #26 |
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So true flopsweat
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06-18-2024, 04:06 PM | #27 |
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And as described in posts #6, #8, #13, and especially #15.
Torque. Gear reduction provides TORQUE. It effectively increases power output by reducing the rpm of the engine through gears. This is exactly what OP is asking about. The engine is spinning at MUCH higher rpm than the rear wheel which results in multiplication of power. So he can power through gravel and sand. I have a planetary 6x gear reduction unit bolted to the direct digital drive with a variable speed controller on my chile roaster. It multiplies the output and provides low speed control. If I put a sprocket on the thing, it would drag a 1000 pound motorcycle into the air. Without that gear reduction, the stepper motor wouldn't have enough juice. This is exactly the same thing that reducing the gear ration using sprockets does.
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06-18-2024, 04:11 PM | #28 |
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Here is the stepper motor without the planetary gear reducer.
The gear reduction box increases the power output of the stepper motor. As Megadan mentioned, this is simple math.
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06-18-2024, 06:25 PM | #29 | |
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Quote:
Equally important is the fact that your stepper motor is, well a motor. Electric motors have constant torque at all rpm. Engines do not, so using this as an example of the "simple math" involved here is not applicable.
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06-18-2024, 07:09 PM | #30 | |
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Quote:
This is exactly what he wants.
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