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Old 01-12-2004, 02:56 PM   #131
sqidbait
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Default Re: Vulcan 2000 Teaser

It was a thought experiment - to illustrate why comparing just the absolute peak torque value is not all that useful. I had a disclaimer at the end of my post after all...



Let's look at a real world example.



Question - what puts the highest peak torque to the rear wheel in first gear: a Buell XB12R or a Yamaha R6?



Place your bets folks, before we continue!



From

http://www.motorcycle.com/mo/mccompa...ns/index.motml



XB12R 72.6 lbft @5750 rpm



From

http://www.motorcycle.com/mo/mccompa...os/600TQ03.jpg



it's not amazingly clear, but we'll say



R6 44.3 lbft@12,000 rpm



Anybody change their bet yet? If you still focus on the absolute number, you'd say Buell, right?



Now, let's factor in gearing.



For the Buell



http://www.buell.com/en_us/products/...r_features.asp



we see that the first gear reduction is:



(1.5)*(2.407)*(2.68 = ~ 9.7



For the R6



http://www.yamaha-motor.com/products...cy&cid=5&mid=8



the first gear reduction is:



(1.955)*(3)*(2.846) = ~ 16.69



And to find the torque to the back wheel...



XB12R 72.6 * 9.70 = ~704 lbft

R6 44.3 * 16.69 = ~739 lbft



So it appears that the correct answer is: the R6! [1]



That's why comparing absolute engine torque numbers isn't all that useful. Horsepower is a bit better, but personally I like to actually see what the thrust curves[2] are, 'cause then you'll see the effects of gearing.[3]



-- Michael



[1] And before I get flamed I'd like to point out that the R6 is significantly faster than the XB12R in the 1/4. There's a reason for that...this isn't just theory!



[2] This involves an additional calculation, based on the tire size, and the "lever" that the torque acts on wrt the ground.



[3] And even this isn't perfect. Another discussion for another time...

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Old 01-12-2004, 05:34 PM   #132
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Default Re: Chrome it!

LOL. imagine a Chomed VFR.
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Old 01-12-2004, 05:37 PM   #133
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Default Re: Vulcan 2000 Teaser

A lot of the torque multiplication/gear reduction factor is cancelled when you consider that 7 inches of sprocket is turning 20 some inches of tire and wheel.
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Old 01-12-2004, 11:57 PM   #134
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Default Re: Is Motorcycle Online going to change its name to Cruiser Online?

I would loathe the world in which people only owned the bike that they thought would get them around willow springs in the least amount of time for the least amount of money.



Pry yer little brain open, and wrap it around the idea that it's perfectly legitimate to buy a bike, or anything else, for reasons other than what's on the stat sheet.
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Old 01-13-2004, 12:28 AM   #135
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Default Re: Vulcan 2000 Teaser

>Nope. I do have a B.Eng, though.



Forgive the ejimicated, but does that stand for a bachelors in engineering? Why does this fill me with deja vu-ish dread?
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Old 01-13-2004, 01:38 AM   #136
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Default Re: Vulcan 2000 Teaser

I agree with you, but what else is there? Some of the other chat rooms are much worse, with lots of profanity and shallow bull*&%# going on, do you know of any good websites, that a gearhead can enjoy?
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Old 01-13-2004, 04:17 AM   #137
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Default Re: Cruisers aren't used that way.

Touche' !
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Old 01-13-2004, 04:22 AM   #138
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Default Ah.... The human condition.

Love it or hate it it's certainly here to stay.



Though I opted for a 4WD (that I actually use *gasp* off-road) over the mini-puke.
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Old 01-13-2004, 04:23 AM   #139
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Default Re: The truth uncovered

Who is John Galt?
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Old 01-13-2004, 05:19 AM   #140
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Default Keeping Longride informed

Click here
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