After market cans?

[NordieBoy]

My one question that still stands to anyone that knows something about exhausts etc is exactly WHAT will happen if i take my exhaust off all together etc and run around like that? aside from it being very noisey etc and affecting power, what is the detrimental effect against the engine? so far nobody has ever answerd it aside from my old man saying you burn valves, but i just love to hear other opinions or even one to confirm this, nobody knows damnit!

You would end up with a revver without as much torque as you could have.

Or am I talking out my arse again?

[pete376403]

I've experienced an exhaust pipe falling of the speedway bike, right up at the port and can confirm that the engine runs as flat as a wet turd. The blue flames look pretty, though. Even shortening the pipe can have a similar effect - just after mufflers were introduced in Speedway, there were regular occurences of the mufflers falling off, which shortened the pipe by about 450 -500 mm. In spite of being completely uncorked, the engines just did not run well at all.

[pete376403]

I'm the person on the poll whose bike is even quieter than stock - after the original Suzuki pipes rotted out I got a Cycleworks 4 -1 with the optional "quiet" baffle. Still loud though, and I couldn't stand the drone.
I replaced the "muffler" with a standard can from a CBR600. Now in theory the 1100 should be thoroughly constipated with a muffler from a motor nearly half the size, but my reasoning was the CBR probably makes its peak power up around 10K rpm, so the amount of flow at that speed is around what my 1100 flows at 5 - 6,000. It is nice and quiet - the air intake is louder - and power doesn't appear to have been affected much, an SV1000 rider was surprised to see me alongside at 180k, even though my bike was two up.

[Hitcher]

Yay Neptune, the Roman god of exhausts! I hear that he was a British bike fan as well (owns a Trident...)

[Milky]

I've experienced an exhaust pipe falling of the speedway bike, right up at the port and can confirm that the engine runs as flat as a wet turd. The blue flames look pretty, though. Even shortening the pipe can have a similar effect - just after mufflers were introduced in Speedway, there were regular occurences of the mufflers falling off, which shortened the pipe by about 450 -500 mm. In spite of being completely uncorked, the engines just did not run well at all.

I tried running the CB125 with the full system off, and that sure killed any low range it might have had. Didnt get it started, but I assume if I had managed to it would have only wanted to run up around 10k rpm

Plus now I`m older and debatably wiser I reckon the less noise you make the more you get away with.My Fazer gives out a really neat low growl at high speed and I can razz along at any speed I want without attracting loads of attention while there are plenty of guys around with full-race systems that you can hear coming for ages before they arrive,talk about asking for trouble.Also it`s pretty selfish,just finished work and got home at 3a.m.,dont think my neighbours would appreciate my Yams acoustic qualities if I woke them all up at that time

That was half the rationale for me wanting to make a change. I dont think my neighbours would appreciate it either... Including the bike nuts who live here and next door

Milky - rough and readies ok,a butchered job can be spot on,done by the book a total stuff up.With resonances if they are all higeldy pigeldy no worries,when it all lines up it can kill power or give a good boost.Change direction 3 times,cheap,easy,and it works - like turn it around,then back again,oh that's twice,but you know what I mean,car mufflers are still done like that.

hmm, milky what you could experiment with too is just the exit hole size using a washer, or you put it usually ahead of the muffler not at the very tail end, i exp with the CB250 like that as it had a straight out megafone, but a washer midway in the zaust seemed to help alot in terms of power where i mostly used it (down low and midrange)

seems like it will be best to just try it and see. The 'zorst doesnt sound greatly different with can on or can off, which makes me wonder a bit. I must measure the diameter of the pipes sometime too.
I do want to get a bit more down low/eliminate the flatspot there, because that is where it gets used most. I hardly ever take the bike up to 14k or whatever the red line is, so the extra HP of the 4-1+larger diameter isnt really that much use to me.
How did you fix this washer in place? I dont particularly want to weld if I am just going to make changes, and I am not sure what the metal would turn out like if I did Hopefully I can find something of a large enough size too. Any restrictions on the type of metal used? Stainless or aluminium would be best I am guessing...

[Kwaka-Kid]

well milks, i am sure i can say ur can is fine - 44m ID 2.5mm perf pipe between 320-450mm long is the norm for a 400cc performance muffler, but the pipe leading up to it could be too big... so yeah re: the washer, either you use a spring washer and it goes somewhere in the exhaust where it can lock and doesnt come any further out, or you just spot weld 2 spots onto it.. and shit yeah man if oyu dont have the right size i certainly should - and shit if not go to mitre 10 and spend 20c

[Omega1]

My ZX7R has a full Arrows system which sounds great and My Harley has stock standard mufflers for the moment.......:-)

[vifferman]

well milks, i am sure i can say ur can is fine - 44m ID 2.5mm perf pipe between 320-450mm long is the norm for a 400cc performance muffler, but the pipe leading up to it could be too big... so yeah re: the washer, either you use a spring washer and it goes somewhere in the exhaust where it can lock and doesnt come any further out, or you just spot weld 2 spots onto it.. and shit yeah man if oyu dont have the right size i certainly should - and shit if not go to mitre 10 and spend 20c

The position of the washer is important, and it should ideally be where the restriction in the stock pipe/muffler was, as this was positioned so that reverse pressure waves up the zorst pipe at low to medium revs pressurise the exhaust port and prevent the incoming charge going straight out of the cylinder. It will probably be near the header end of the muffler.

[Cajun]

The position of the washer is important, and it should ideally be where the restriction in the stock pipe/muffler was, as this was positioned so that reverse pressure waves up the zorst pipe at low to medium revs pressurise the exhaust port and prevent the incoming charge going straight out of the cylinder. It will probably be near the header end of the muffler.

hey firestorm where you pipes to loud with the final baffle taking out, thinking of doing it to wifes bike?

[svs]

Did have two-bros can on, but failed WOF for being too loud Now got standard can back on, and you can feel the difference. Not much difference in power/top speed, but the engine doesn't rev nearly as freely with the restrictive stock pipe.

[vifferman]

hey firestorm where you pipes to loud with the final baffle taking out, thinking of doing it to wifes bike?

Are you kidding?!?
I got sick of everyone (and I mean EVERYONE) turning to see what was coming down the street. We're talking HD drag pipes loud here...
I fixed them because (a) I had no show of getting a warrant, unless I shopped around, (b) they were annoyingly loud for me, let alone anyone else, and (c) I was afraid of the attention they'd attract, which was important given I go past the HP HQ twice a day...
Now they are loud, rather than LOUD!!
There was a pair of OEM cans for a VTR on TradeMe that had been 'professionally' gutted and had the endcaps put back on. There was also a pair of Scorpions that I would've bought if I could.

I wouldn't bafflectomy the wife's bike if I were you. But if you ignore me and do it anyway, I can point you to the links on how to do it, and tell you what to do about getting plugs to quieten it down again and make it look 'stock'.

[Cajun]

Did have two-bros can on, but failed WOF for being too loud Now got standard can back on, and you can feel the difference. Not much difference in power/top speed, but the engine doesn't rev nearly as freely with the restrictive stock pipe.

oh okay, we just gonna do that baffletokmy thing where you remove the back chamber??

you style have the two bros?? you interested in selling them? what type are they carbon/stanless?

[vifferman]

oh okay, we just gonna do that baffletokmy thing where you remove the back chamber??

Yeah, that's what mine had. The endcap is drilled out with a holesaw, then the last baffle tube is ripped out. The zorst gases then go up the main baffle tube, then out the end, instead of up, down, then up and out.
By the way, Cajun - the SV650 has only one muffler.

SVS: don't throw away the aftermarket can; you should be able to get it quietened down enough to keep the WOF guys happy, like I did with my norty vandalised mufflers.

[Cajun]

Yeah, that's what mine had. The endcap is drilled out with a holesaw, then the last baffle tube is ripped out. The zorst gases then go up the main baffle tube, then out the end, instead of up, down, then up and out.
By the way, Cajun - the SV650 has only one muffler.

oops should be reading before reply better.

Nah wife says she wants to make it louder, she had bike 2 years and its total stock apart from rebuilding the rear shock from new to lower the seat height by 4 cms so she can touch the ground better

Yep give us any info you have on doing, i have one site, but wasn't that good, any more info would be good

[svs]

Aftermarket can has found a happy home on the race bike. No noise probs there so it all worked out alright in the end.

Has anyone used the Quill pipes from the UK which are supposed to be road legal noise wise, but give you almost the same power increase as a race can?