After market cans?

[Milky]

I'm getting a CBR400RR can for free and was planning to de-baffle it. Is that a stupid idea? Is there anything else I can do with this new pipe?

the problem you may run into there is although it will be freer flowing than standard, more often than not it will sound like absolute shite - louder but the same tone as standard. It depends on the design of the baffling inside the muffler I guess, so all you can do is try it and see...

[Coyote]

the problem you may run into there is although it will be freer flowing than standard, more often than not it will sound like absolute shite - louder but the same tone as standard. It depends on the design of the baffling inside the muffler I guess, so all you can do is try it and see...

I'll give it a go. I'll let you know what it turns out like

[inlinefour]

Thanks for the good idea, Deano!

Unless its a sport bike for racing. I can't understand people who get off on farkin noisey rides....

[Rainbow Wizard]

KK,
Good,you do know some exhaust theory.Yep,300 ft per sec at max rpm is a good guideline,this is acheived with diameter of the pipe,if the pipe is too fat,gas speed goes down and power suffers everywhere,need more back pressure they say.Too small and top end suffers,but you pick up bottom end,typical factory pipe.Length of pipes is resonance tuning and is how old farts like me muck around with exhaust systems,there are formulas available anywhere,nice and easy on singles.

So do you or anyone else want to offer a QUALIFIED opinion on what to do to le Voxan's cans?
1200mm of 45mm ID pipes and 460mm long 90mm ID cans with a 25mm discharge. The first 90mm chamber is 160mm long with about a 37mm ID pipe that extends 120mm into the next chamber that has a multi-drilled (3mm? holes) disc in the end of it positioned about 200mm (this is the second chamber's length) beyond the first chamber's cap. The final chamber OR the final pipe is therefor about 300mm long, and as much as the last 150mm of that must be drilled to let some of the baffled air from the drilled disc to enter it (otherwise ther'ed be no point in drilling the disc).

Seems to me that if I drill a small hole in the first disc some unbaffled air will enter the final discharge pipe and make the bike just that little bit louder. Question is, what diameter do you recommend?
I'm guessing 6mm maximum. At the moment it sounds somewhere between a Honda and a Ducati, and I want a more Ducati-like note.
Tell all Oh Gas Tro-gnome.

[Motu]

Just a little at a time,unit you get the sound you want.

[JohnBoy]

Unless its a sport bike for racing. I can't understand people who get off on farkin noisey rides....

i of the firm belief that loud pipes save lives!!
peace and quite is only an ear plug away!

[WINJA]

I have 11 motorcycles at the present time - one after market can (Supertrapp) on the XT400,on the XLV750 my own system (try buying one of those) but also silencers of my own manufacter,XS1 has aftermarket mufflers,spiked but similar noise to stock,PW50 has my system,namely a couple of lawn mower mufflers end to end,KT250 has original muffler with my own baffle,SL125 has an aftermarket job,similar noise to stock,TLR200 is stock and whisper quiet (fails noise test) TT225 has stock system but I will build my own muffler onto stuffed original system.All the rest (3) are stock.

So,where do I fit in that poll???

FORGET THE POLL , YOU HAVE THE MOST BIKES EVER

[rudolph]

I have 10 bikes at the moment, all with mods done to the mufflers and exhaust systems, I have open drag pipes on my BMW witch gives it better topend power and sounds cool, a cople other bikes a have Cobys on them, i made a 4 into 2 for my CB900

[cowpoos]

huh? im not saying its going faster - the opposite, generally i thought you needed to maintain approx 300 ft per sec gas flow speed, and i think with my exhaust being so free flowing its not getting there.
also lack of backpressure i was taught creates the valves to heat up and you ca burn them or something along those lines - its the pressure of the gas that takes the heat away from them right?

errrr.....huge subject.....and every engine responds better or worse to different speeds,flows,back presure [if any],lenght,diameter....endless variables...

[Lou Girardin]

Unless its a sport bike for racing. I can't understand people who get off on farkin noisey rides....

On Bandits cans give you another 10 hp.
Plus I like the sound.
But I don't agree that they are safer. Cagers don't hear sirens when they're right behind, so what chance does a noisy can have?