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Old 06-01-2008, 12:16 PM   #1
SLOWPOKE
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Bike Shop or 24 HR Fitness?

Yesterday, I was lucky enough to see a guy about 295 lbs zooming down the freeway on a busa. This got me to thinking about weight vs horsepower. If anyone knows, exactly how much does weight effect horsepower? Is their like a ratio of every 10 lbs = 1 hrs power lost. Maybe $30 bucks a month at 24 hrs fitness is a better investment than that $1000 exhaust system!!

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Old 06-01-2008, 12:18 PM   #2
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heard it was around 3lbs per HP
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Old 06-01-2008, 12:20 PM   #3
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then the argument turns into do you have more time & discipline than $...most don't.
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Old 06-01-2008, 12:23 PM   #4
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I read somewhere it was about 5lbs per HP. But I can assure you the heavier you are the slower you go with everything else being equal.
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Old 06-01-2008, 12:27 PM   #5
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So if I did my math right me on a 650R would put me into the negative HP figures.
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Old 06-01-2008, 12:30 PM   #6
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Quote:
Originally Posted by Dy Lon View Post
So if I did my math right me on a 650R would put me into the negative HP figures.
Well if you weigh over 450lbs. Yeah?
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Old 06-01-2008, 12:31 PM   #7
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240
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Old 06-01-2008, 12:33 PM   #8
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240 divided by 5 = 48 hp taken away.
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Old 06-01-2008, 12:38 PM   #9
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I did it by 3 and it came out to 80 and I was like WTF it only has 71!
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Old 06-01-2008, 01:07 PM   #10
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It all depends on the current power to weight ratio. If you have a very high power to weight ratio (e.g., 600 SS), small increases in weight have a very large affect. If it's a relatively low ratio (e.g., HD dresser), not so dramatic.

Here's a calculator that you can play with. It's geared for cars but seems to be reasonably accurate for motorcycle weight/HP numbers too. http://www.web-cars.com/math/qtr_mile.html Use the "Quarter Mile Acceleration Elapsed Time and Terminal Speed Comparison" and see how much that spare tire costs you acceleration-wise.
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Old 06-01-2008, 01:42 PM   #11
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Just remember, torque moves you. If you have a fat , go for something with a buncha torque. That's what I did....
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Old 06-01-2008, 02:13 PM   #12
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Old 06-01-2008, 02:22 PM   #13
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<--bought something so his 225lb, 5'11'' and 32" waist would never have those problems
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Old 06-01-2008, 02:25 PM   #14
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As I understand it, it is 10 lbs = 1 hp
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Old 06-01-2008, 02:26 PM   #15
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ahem....
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Old 06-01-2008, 02:31 PM   #16
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im not sure you can say weight takes away x amount of horsepower. or instance theres a lot of big guys on here that ride 50's. do the math and what do you get?
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Old 06-01-2008, 02:54 PM   #17
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A bunch of stressed out 50's?
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Old 06-01-2008, 03:02 PM   #18
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Unless your racing and your in the lead I would'nt worry about all these weight vs hp numbers.

I stay between 190-200 lbs, my bike that i race on in the tmgp makes about 8-9 hp and it's weight (wet) is probably under 180 lbs. I'm still faster then alot guys have my size on the same bike.

The only time I start to worry about the weight vs hp is when someone same skill pulls on me on the straights in top gears. :(...

LIke I said for you street riders I would'nt worry about it...unless your like 6'4 and 300 lbs and your on a old carb ninja 250 - then maybe, just maybe
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Old 06-01-2008, 03:29 PM   #19
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7 lbs = 1 hp
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Old 06-01-2008, 04:02 PM   #20
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Everyone gets too hung up on HP numbers anyhow... HP is a function of torque and RPM.

You can measure torque (rotational force), but you have to calculate HP.

The old adage from my drag racing days still holds true.. TQ accellerates, HP gives you the top speed. Equal bikes, equal gearing, with same weights; the one with more TQ will win the drag race, and the one with more HP will win on top speed, aero permitting.
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