Silly bugger

[Sniper]

You don't approve?

[Krayy]

http://www.trademe.co.nz/Trade-Me-Mo...n-54302762.htm

Read the second question.

Which just goes to prove that if someone points out that you're lacking a bit of vital knowledge or make a stupid statement, don't admit it!! Laugh it off and tell the guy whos hassling you that that you KNEW it was a windup, and the reply was made with tongue firmly in cheek. Better that than reply with a very meek "k...".

[lti]

i dont think he got it when he said "k..." i think he was still as confused as before.

[Lord Derosso]

I should have revised my earlier question but thanks for the excellent techno information. What I meant to ask is .... do manufactors design a bikes powerband to certain riding conditions. eg surely race bikes would have huge powerbands covering practical rev ranges, and road bikes at certain revs to facilitate overtaking etc.???? Or perhaps they cant really 'design' a powerband as such, it just exists, and lastly do cars have them? Having never owned a car, and barely remembering driving one, I dont know and am curious. Thinking we notice it on bikes due to power/weight ratios??????

[Krayy]

I should have revised my earlier question but thanks for the excellent techno information. What I meant to ask is .... do manufactors design a bikes powerband to certain riding conditions. eg surely race bikes would have huge powerbands covering practical rev ranges, and road bikes at certain revs to facilitate overtaking etc.???? Or perhaps they cant really 'design' a powerband as such, it just exists, and lastly do cars have them? Having never owned a car, and barely remembering driving one, I dont know and am curious. Thinking we notice it on bikes due to power/weight ratios??????

Ahhh...now the floodgates will open with all sorts of techno-mechanical-physics type answers, so I'll try to get in quick with my non-technical 2 cents worth.

The answer is, it depends on what the bikes intended audience is. If you're trying to sell someone a cruiser or tourer that will pull you and 3 saddlebags worth of junk around the countryside, you would want an engine that has a "fat" powerband (for want of a better term). This means less shifting, ad when you hit a hill, you just wind it on some and the donk pulls you to the top nice and easy. These engines usually have a nice torque curve and pulls fairly consistently over the whole rev range.

Now if you're a racer, what you want is peak power all the time to provide the best acceleration out of corners. These engines will usually produce most of their power near the top of the rev range, and will be geared so that an upshift will still keep the engine within that band. Torque curves on these engines will look flat at the lower end, then peak really suddenly over the last 2-3k of the rev range, but will generally be shorter than a lumpier donk.

try: http://vettenet.org/torquehp.html
and the most excellent: http://auto.howstuffworks.com/horsepower1.htm

[Ixion]

I should have revised my earlier question but thanks for the excellent techno information. What I meant to ask is .... do manufactors design a bikes powerband to certain riding conditions. eg surely race bikes would have huge powerbands covering practical rev ranges, and road bikes at certain revs to facilitate overtaking etc.???? Or perhaps they cant really 'design' a powerband as such, it just exists, and lastly do cars have them? Having never owned a car, and barely remembering driving one, I dont know and am curious. Thinking we notice it on bikes due to power/weight ratios??????

Yes, they do design them around usage. Race bikes will have a very narrow power band. Thing is , it's hard to make an engine produce maximum torque over a wide rev range. Engines are tuned for optimum performance at a certain rev range. The more you try to "spread out" that range the more you have to pull down the peak torque , and thus power. So, a tourer will have a "broad" power band. Wider, so there is reasonable power across a wide rev range - you don't want to constantly have to be changing gears when touring- but less maximum power - it's a tourer. A sprotsbike will go the other way - aim for maximum power, even it means that the rider has to change gear lots to keep the revs up.

Cars are not usually nearly as highly tuned as bikes - which is why you don't notice the powerband - it's so broad that it's not perceptable on most cars. But the Alfatoy, for instance, has a quite discernable powerband between 5000 and 8000 rpm. It's just more highly tuned than most cars.

[Drew]

Yes, they do design them around usage. Race bikes will have a very narrow power band. Thing is , it's hard to make an engine produce maximum torque over a wide rev range. Engines are tuned for optimum performance at a certain rev range. The more you try to "spread out" that range the more you have to pull down the peak torque , and thus power. So, a tourer will have a "broad" power band. Wider, so there is reasonable power across a wide rev range - you don't want to constantly have to be changing gears when touring- but less maximum power - it's a tourer. A sprotsbike will go the other way - aim for maximum power, even it means that the rider has to change gear lots to keep the revs up.

Cars are not usually nearly as highly tuned as bikes - which is why you don't notice the powerband - it's so broad that it's not perceptable on most cars. But the Alfatoy, for instance, has a quite discernable powerband between 5000 and 8000 rpm. It's just more highly tuned than most cars.

All you have said is true and correct to my knowledge, up untill recently that is.
However, the very clever sods at BMW(cage type) have an entirely different new system, they have done away with the throttle! Replacing it with fly by wire computer jazz. How much more efficient could it be you might ask? Extreemly, because the way it works, is by making valve timing, lift, and duration variable.
Sounds easy dont it, but think about it, if those things are all being adjustedf fifty times a second, the motor is running at it's peak performance, nomatter wher the tacho is pointing, nomatter where your foot is on the gas, and nomatter how much load it's under.
It will still accelerate slower up a hill with a trailer, but it will be as close to perfectly tuned to that task as the engine can be.
Torque curve turns intop flat line at the point where a curve was at the top, same thing with power.
Now HOW FUCKIN COOL WILL THAT BE ON A GIXXER THOU?!


Rant over, stay off the PEEEEEEEEEEEEEE!!!

[Lord Derosso]

Best of series been on various TV stations....

why do we put a jet engine into a bike??

because we can!

[imdying]

lmao @ the bullshit in this thread... looks like most people have some idea though. I'd be concerned more about the front fairing only having one of four bolts, and even that one being the wrong type. It's a piecea alright.

[Drew]

Feel compelled to bite at "bullshit" remark...can't hold back....going to a happy place...urge overcoming me...grrrrrrrrrrrraaaaaaaaaaaaggggghhh.




That was lucky, vein in me forehead popped and I blacked out long enough to control myself.....




I really need to take myself less seriously.

[GSX-RJIM]

you have to watch those powerbands, i think the old ones were made of rubber, its best to upgrade to kevlar or titainium ones!

HAHAHAHAHAHAHAHAHAHAHAH

[gav]

Quite right, kept looking for this nice bike, all I see is a shitty old NSR250!
However powerbands, depends what colour band you use, this thread may help!! http://www.thumpertalk.com/forum/sho...d.php?t=358415

[Stevo]

I am surprised that fella tryin to swap his V8 Statesman (with any sportsbike) hasn't entered into this one. I give that fella 10 points for persistence

[Stevo]

Quite right, kept looking for this nice bike, all I see is a shitty old NSR250!
However powerbands, depends what colour band you use, this thread may help!! http://www.thumpertalk.com/forum/sho...d.php?t=358415

Three words:
Only in America!