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Old 08-21-2009, 01:16 AM   #1
derf
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Default 25 years of sportbike development

http://hellforleathermagazine.com/20...5-years-o.html

Take a look at this interactive graph. It starts in the 80s and shows power to weight through time. Its pretty cool. Botice that it is a pretty steady drop in weight and gain in power until 2005 when the emission standards changed, but even that blip in the other direction was overcome within a few short years
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Old 08-21-2009, 10:23 AM   #2
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Great find. Yeah every 2-3 years they get two to five percent better, but those are just power to weight numbers, braking, handling, durability, all getting better and better!!!
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Old 08-21-2009, 10:27 AM   #3
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Crap...blocked at work.

My very first streetbike was a 1988 Ninja 600R...boy I thought that bike was something.
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Old 08-21-2009, 10:32 AM   #4
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mine was an 87 hurricane 600 kindof an eye opener when the 954 was lighter and far more powerful
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Old 08-21-2009, 10:38 AM   #5
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Quote:
Originally Posted by Dave View Post
mine was an 87 hurricane 600 kindof an eye opener when the 954 was lighter and far more powerful
My friend bought the Hurricane when I bought the Ninja. I have owned two Honda's...94 F2 and 95 F3.
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Old 08-21-2009, 10:48 AM   #6
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My first racebike was a bonestock 95 F3. Great bike, did lots of sprints and endurance races on em'
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Old 08-22-2009, 05:16 PM   #7
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I think the next big thing is going to be downforce incorporated into the body work.

They'll make it lighter to help accelerate, then have downforce to stick it to the ground.
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Old 08-23-2009, 01:29 PM   #8
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Cylinder filling is just about as efficient as it will get.

It has a giant pump pulling the air in. Aside from forced induction, you don't get too much more power from head work.
If all it took to increase tq was to polish your intake ports and have the intake velocities be spot on, wouldn't the manufacturers be doing it?

I suppose decreasing losses would count, suzuki did it on their bikes by reducing pumping losses in the cylinders themselves.

Falls under the law of diminishing returns.
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Old 08-23-2009, 01:34 PM   #9
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i actually was referring to forced induction. and kawasaki already hand finishes their intake ports
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Old 08-23-2009, 01:36 PM   #10
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Gotcha.

Forced induction mimics higher displacement.
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