KIPS resonator modifications
- Thread starter jpm200
- Start date
The whole idea of having the resonator is to increase bottom end. I'd guess the idea here is to even increase the bottom end more. I thought about doing something like that... If you wouldn't mind, would you try running the bike without the spacer, and then see how it runs? If there is less bottom end with it out, then I want to build a spacer too.
Thanks,
Jon!
Thanks,
Jon!
There was a small discussion here about this modification a while ago. The consensus seemed to be that it was a waste of time, with no noticeable improvements to bottom-end power.
It won't hurt to leave it in place, though, jpm200. If someone's gone to all the trouble of making up the spacer and gluing it to the cover, just leave it. Maybe you get 2% more bottom-end torque for free...
It won't hurt to leave it in place, though, jpm200. If someone's gone to all the trouble of making up the spacer and gluing it to the cover, just leave it. Maybe you get 2% more bottom-end torque for free...
canyncarvr
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- Oct 14, 1999
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Regarding the mentioned thread: I don't recall there being any definitive result...or that it was even experimented with. Just talked about.
Kinda like adding a torque ring to the pipe. Certainly there's some reason to go to the trouble of engineering the complicated mechanical KIPS in the first place. Would be nice to know what the formulation is for determining resonator volume.
But, not having that, empirical justification would be great. Jpm...don't ruin your existing cover....just buy a NEW one for testing!!;) Let the rest of us know how it works!
...and next time you're riding in the state of jefferson I'll buy 'ya a brewski! (From oz? Yeah...I'm safe on THAT bet!)
Kinda like adding a torque ring to the pipe. Certainly there's some reason to go to the trouble of engineering the complicated mechanical KIPS in the first place. Would be nice to know what the formulation is for determining resonator volume.
But, not having that, empirical justification would be great. Jpm...don't ruin your existing cover....just buy a NEW one for testing!!;) Let the rest of us know how it works!
...and next time you're riding in the state of jefferson I'll buy 'ya a brewski! (From oz? Yeah...I'm safe on THAT bet!)
David Trustrum
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- Jan 25, 2001
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So what is the purpose of the chamber, is it a resonator like in the inlet?
No I think not, it’s purpose is a disrupter to help counter the harmful effects of the pipe’s returning wave at lower revs. Honda’s ATAC chamber was used for this porpoise. Therefore I don’t believe a variation on size will be of any benefit. Not that that would stop the aftermarket selling you something & claiming better fuel mileage, reduced wrinkles and better dynamic sex appeal. Maybe your bike needs a course of Magnets to polarise it’s ying or something.
Send your cheque to the usual address. ;)
Careful, Canyncarvr an Aussie WILL probably travel that far when a free beer is in the offering.
No I think not, it’s purpose is a disrupter to help counter the harmful effects of the pipe’s returning wave at lower revs. Honda’s ATAC chamber was used for this porpoise. Therefore I don’t believe a variation on size will be of any benefit. Not that that would stop the aftermarket selling you something & claiming better fuel mileage, reduced wrinkles and better dynamic sex appeal. Maybe your bike needs a course of Magnets to polarise it’s ying or something.
Send your cheque to the usual address. ;)
Careful, Canyncarvr an Aussie WILL probably travel that far when a free beer is in the offering.
Mike stoeb
Member
- Sep 17, 2002
- 2
- 0
The reason for the spacer is to increase the volume fooling the engine into thinking its got adiffernt length (and volume )exhast pipe
- Thread starter
- #9
Went back to my noise text from uni to work out the effect of changing the volume.
A Helmholtz resonator is used to drop noise and is most effective on fans and things that run at a constant speed.
The device would dampen the pressure waves most effectively at a particular frequency with effectiveness dropping off the further you move away above and below that frequency.
The fundamental frequency of the device can be calculated from
f = c * sqrt(A/LV)
where c = the speed of sound
V = the volume of the chamber
A = the effective area of the inlet
and L = the effective length of the inlet.
The net effect of this is that the increase in the volume provided by the spacer causes the resonator to operate at a lower frequency.
I still haven't got my head around the effect in the real world not knowing the actual frequency that the original was optimised for and exactly what the application is to a 2 stroke exhaust.
It took long enough to get my head around what each of the expansion, reduction and stinger parts of the exhaust do let alone the modifications to this by an opening and closing resonator.
A Helmholtz resonator is used to drop noise and is most effective on fans and things that run at a constant speed.
The device would dampen the pressure waves most effectively at a particular frequency with effectiveness dropping off the further you move away above and below that frequency.
The fundamental frequency of the device can be calculated from
f = c * sqrt(A/LV)
where c = the speed of sound
V = the volume of the chamber
A = the effective area of the inlet
and L = the effective length of the inlet.
The net effect of this is that the increase in the volume provided by the spacer causes the resonator to operate at a lower frequency.
I still haven't got my head around the effect in the real world not knowing the actual frequency that the original was optimised for and exactly what the application is to a 2 stroke exhaust.
It took long enough to get my head around what each of the expansion, reduction and stinger parts of the exhaust do let alone the modifications to this by an opening and closing resonator.
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canyncarvr
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- Oct 14, 1999
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Exactly!
And...why are returning waves bad at low revs? 'Things' are slow enough that returning waves contaminate the incoming A/F charge (time enough to stuff too much already burned fuel back into the cylinder)?
It does all come down to 'tuning' of the system..and the resonator (and the rest of the KIPS) dynamically effects that tune. The wherefores hows and whys of that I certainly don't get MY head around....
Increased sex appeal? WoW...there's a most excellent porpoise!! Maybe even a SPECIAL porpoise?? ;)
Let us not forget the yang of the matter! Magnets work for that, too?
cool
...it's in the mail.
David Trustrum
~SPONSOR~
- Jan 25, 2001
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- 0
Temporally out of stock, but don’t worry I’ve cashed the cheque for safe keeping and I will dispatch it as soon as stock becomes available.
