All bikes have powerbands.

[The Pastor]

Do all bikes (and cages) have powerbands?

[limbimtimwim]

Do all bikes (and cages) have powerbands?

I know my mother's Peugeot is held together with rubber bands.

[curious george]

Yes, but I would like you to be more specific with your question.

[Gixxer 4 ever]

Not sure about that. I rode my sons GPX 250 and was waiting for the power band to come in. Noted the tack was at 14000 rpms and decided I must have missed it. But in all fairness to the bike it keeps up with the big bikes on the rides like the one we just had to Taupo.

[The Pastor]

Well I was having an arguement with magua about powerbands, he told me every thing has a power band, his rg150 my old zxr250c his mums car, my car indiana's fxr150....

I think that all cars/bikes do not have power bands. My car certianly doesnt. I wanted to know what you jokers thought. (yes his rg150 does have one im just saying that not everything has one... my old zxr had one but that I think was because it was a bit broken somehow...)

[SPORK]

We need a big dose of Motu in here...

[T.I.E]

two stroke engines will sometimes have a (power band) extra increase in power when hit at a certain rpm.


but all vechiles have a (power band) meaning a wave form or sign graph on what power it producers at what rpm.

so my understanding is there are two types.

[Hitcher]

Do all bikes (and cages) have powerbands?

Yes. The faster they go, the further up and down in the sleeves the pistons go. If you go too fast the piston either impacts the head or drops out the bottom into the sump. Be careful.

[mini_me]

two stroke engines will sometimes have a (power band) extra increase in power when hit at a certain rpm.


but all vechiles have a (power band) meaning a wave form or sign graph on what power it producers at what rpm.

so my understanding is there are two types.

This is my take on the whoel thing - feel free to correct me

alll vehicles have a powerband period. some are just more savage than others
and a powerband is a powerband there isn't different types just varying degrees of 'steepness' (when looking at the powercurve (hp vs Nm) on paper)
Using my v4 as an example, You lok at the dyno sheet and you see a bulge in the middle of the rpm range (AKA midrange) this is where the motor generate the most power and hence is called its powerband
but if you look at an IL4's powercurve you can see the bulge is near the upper end of the rpm range so this tells one that the powerband is near the top end of the rev-range

also powerbands are adjustable to a degree with the type of tuning that you do to your motor - you can tune in a big bottom end and nothing up the top and vice versa or you can have it somewhere in the middle or you can spread it out evenly over the whole powercurve and hence the reason some vehicles are not thought of as having a 'powerband' but in reality they just have one big powerband

m/m

[Ixion]

It depends on your definition. All bikes have a power CURVE. In some there is a section on the curve where there is a noticeable increase in steepness. In others the curve goes up at a much more steady rate.

Perceptually, if there is a sudden marked increase in the steepness of the power curve, the rider will notice it - a small increase in revs will suddenly produce a lot more power. If the curve is more gradual the increase is less noticeable.

At what point the change in the angle of the curve qualifies it to be called a "powerband" is arguable. But , in the reality, most riders will agree - the FEELING is easy to detect. But it is arguably true to say that all vehicles (even diesel trucks) have a powerband - just some are so gentle that it's hard to detect where they start.

[T.I.E]

This is my take on the whoel thing - feel free to correct me

alll vehicles have a powerband period. some are just more savage than others
and a powerband is a powerband there isn't different types just varying degrees of 'steepness' (when looking at the powercurve (hp vs Nm) on paper)
Using my v4 as an example, You lok at the dyno sheet and you see a bulge in the middle of the rpm range (AKA midrange) this is where the motor generate the most power and hence is called its powerband
but if you look at an IL4's powercurve you can see the bulge is near the upper end of the rpm range so this tells one that the powerband is near the top end of the rev-range

also powerbands are adjustable to a degree with the type of tuning that you do to your motor - you can tune in a big bottom end and nothing up the top and vice versa or you can have it somewhere in the middle or you can spread it out evenly over the whole powercurve and hence the reason some vehicles are not thought of as having a 'powerband' but in reality they just have one big powerband

m/m

might be totally right. never thought of a power band as a period of a engines power range or it's peak power.

so it's not it's peak power, but the range of a engines ability either side of it's optimum power, what is the norm for + and - from it's peak potentional?
%10, from which we measure it's power band. or is it more of a lose term.

[roger_doger]

I may be missing the mark here but I think the original debate may have stemmed from a confusion over what is correctly known as a powervalve. A powervalve is a sort of sliding plate that is attatched in front of the exhaust port of two stroke bikes (motocross and some road). The reason is that because high performance two strokes have large expansion chambers to produce high power, they would otherwise suffer greatly in low to mid rpm power because of the lack of exhaust back pressure. Different setups are operated either by cable or electronically. The "valve" is down at low rpm to create more backpressure (and power), and then opens at higher rpm so the bike can produce maximum horsepower.

The effect of all this is that in real riding conditions, it creates a sudden surge in power when the valve opens, which is a trademark of any high performance two stroke.

The confusing bit is that a powervalve is often called a powerband. But that word is also used when describing the power delivery of any motor.

But to be clear, powervalves are only present in the form described on two strokes. There is additional confusion to this saga however as Yamaha, and more recently Suzuki, have used the same principle in their four stroke sports bikes in the form of valve located in the middle of the exhaust system. This setup is used for the same purpose as a powervalve in two strokes

Just my 2c worth

[mini_me]

so it's not it's peak power, but the range of a engines ability either side of it's optimum power, what is the norm for + and - from it's peak potentional?
%10, from which we measure it's power band. or is it more of a lose term.

i've allways just thought of it as a loose term and if differs from engine to engine (or bike to bike whatever you prefer) and i dont think you can really quantify a powerband as such, and because of this there are so many different opinions about what a powerband really making it very hard to define just what it is
m/m

[Jackrat]

Do all bikes (and cages) have powerbands?

NO,at lest Kawasaki ZR750's don't.
You wann'a buy one?

[vtec]

I agree with pretty much everything said here.

I've had some serious dumbasses asking me if my bike has a powerband. And I have to help them sort out what they mean by a powerband. Most of the time, its just a term they've heard dirtbike rider's use, in terms of when the engine changes over the powervalve.

I agree that a powerband is a motorbike's effective power range or possibly, just the range where it really starts to boot you in the pants. In this case, that would mean that every vehicle has a powerband, cause all vehicles have an effective power range. Just my dad's diesel van's powerband goes from just above idle right to where you lose power, (I don't know where it is cause it ain't got no revmeter). And my little one here goes from 10,000rpm to 19,000rpm.