removing baffels in stock pipe...

I was talking with a couple guys at my local bike hang out and they were talkin about drilling out or cutting out the baffels in their stock cans. They said it sounds good and dosen't harm much the bike. Anyone had any experience with this or know if it's a good plan or not. The funds are low and I'd like to have a little louder can asap. Any help would be appreciated.

i punched out mine in my 06 f4i. it does sound a little better to me. its not near as noticable as a aftermarket pipe,but hey, its FREE!!!!
i used a 1/4" rod i had and sharpened the end,then once i had a hole made in the baffle,i used a 1/2" stick of all thread and knocked it on through. it actually broke loose the welds from one side and pushed it over to the other side
it sounds really cool at like 3000 rpms. it lopes

    i did it to both my 1000RR and my new 600RR

you take about a 18"long drill extension and attach a 1" metal holesaw to it

make sure the bike is running so that the exhaust blow the chips out the back instead of into the pipe

just got back from the moto gp, what a crazy, awesome event that was, i'm going to go down and drill it out right now, i'll let you guys know how it turns out.

umm... i must be an idiot.. cuz i have no clue whats goin on..

think I could get some pics of exactly where 2 drill, what 2 drill, and what 2 use... ??

thanks

Finally got around to drilling a hole in the baffel. It made a slight differance in the sound a little more raspier at certain rpm's. Nothing in power as far as I can tell. It was pretty easy to do, like BAXSOM said, you'll need the at least an 18" drill extension, I used two 12inchers to get the job done and then a 1 inch hole saw bit. You can only use 1 inch cuz nothing bigger will fit through the muffler outlet. the best place to drill through is the right side of the can(looking from the tip of the muffler) where the piping connects to the muffler. I removed the whole assembly and put it in a vice, I was too worried about shit gettin into the piping and plus there would be a 1inch circular piece of metal floating around in there. Don't get wild with the drill speed at first, you'll end up with the bit trying to cut holes everywhere, go slow and get the metal scored with the bit and then increase you're speed. If you're looking for a cheap way to get the stock exhuast a little louder then this is what to do. I'm going to try and remove the whole baffel pretty soon, I'll let you know how that turns out, and I'll try and get some pictures up soon.

HAHA,, you just flushed a smooth HP/torque curve down the toilet...Now youy will need that $$$$  slip-on , jet kit, possible dyno time... what a ... Ya always listen to the doofs, at the local... put cards on your rims it sounds cool, for 138.5 rpm span... I KNOW you lost some bottom end...   I know you gain hardly measurable anywhere... Wow cool... learn about what you are trying to do... why, what,  what the heck the real outcome does...  Oh and while I'm smok'n you ... that muffler will be gettting you,cop looks... There are a million threads here telling you how to "Properly" make HP... what , why.. HOW !!!!!!   Meanwhile  blog up "revision therory "on the web... and see what a goofy thing you just did. No, no one else made you... but you did get some"worthless" advice...
"Wow, I just got back from a GP... "do you think those bikes are "just loud' w/ no tunning of EVERYTHING?????, in conjuction w/ EVERY THING ELSE... the the suspension tuned, to embrace the power/torque curves...  This thread reeks of airshocks, coleslaw spinner hubcaps, no mirrors, and no clue. Learn... live!!!!
free and clean,   Ripp'n

quote:

ORIGINAL: rippn

HAHA,, you just flushed a smooth HP/torque curve down the toilet...Now youy will need that $$$$  slip-on , jet kit, possible dyno time... what a ... Ya always listen to the doofs, at the local... put cards on your rims it sounds cool, for 138.5 rpm span... I KNOW you lost some bottom end...   I know you gain hardly measurable anywhere... Wow cool... learn about what you are trying to do... why, what,  what the heck the real outcome does...  Oh and while I'm smok'n you ... that muffler will be gettting you,cop looks... There are a million threads here telling you how to "Properly" make HP... what , why.. HOW !!!!!!   Meanwhile  blog up "revision therory "on the web... and see what a goofy thing you just did. No, no one else made you... but you did get some"worthless" advice...
"Wow, I just got back from a GP... "do you think those bikes are "just loud' w/ no tunning of EVERYTHING?????, in conjuction w/ EVERY THING ELSE... the the suspension tuned, to embrace the power/torque curves...  This thread reeks of airshocks, coleslaw spinner hubcaps, no mirrors, and no clue. Learn... live!!!!
free and clean,   Ripp'n

wow dude chill
dork
just to prove you wrong i am posting the dyno sheet of a totally stock 07 600RR with the baffles punched out that was made just a few days ago.

the bike has 200 miles on it
temp 93F
max power was 97 rwhp which according to the other stock 07 600rr that this shop has done was spot on
the 96 on the map is the pre punched out
the 97 is the post punched out so as you can see not a lot of difference but the power and torque curve stayed the same just slightly higher after opening it up
i may be no expert but the papers dont lie
not saying that you are wrong or anything far be it from me to call out someone but i have on paper proof that my power curve is fine, where is yours.
next thing you are going to tell me is that the HTEV was put there for low end torque and not epa noise restrictions





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ps you spelled theory wrong

Hahahahah - 97rwhp out of an 07 600RR?!?!?  Damn - that sucks.
 
My wife's stock 05 600RR just dyno'd the other night at 101.4rwhp.  The hottest bike done that night was a new ZX14R that put out 161rwhp.

quote:

ORIGINAL: fishnride

Hahahahah - 97rwhp out of an 07 600RR?!?!?  Damn - that sucks.

My wife's stock 05 600RR just dyno'd the other night at 101.4rwhp.  The hottest bike done that night was a new ZX14R that put out 161rwhp.

different bikes
different dynos

apples to oranges

the 06s with full systems engine head work and custom maps were only doing 105 on this dyno

being a "super member" one would have thought you would have been around long enough to know that every dyno gives different numbers

It's hard to brag about horsepower readings from dynos unless you're comparing them to runs done on the same dyno to stay consistent.

quote:

ORIGINAL: slip_

It's hard to brag about horsepower readings from dynos unless you're comparing them to runs done on the same dyno to stay consistent.

and technically to be totally acurrate, you should baseline,
do the mod and then run again immediatly

I realize that different dynos give different results based upon many variables.
 
The part of this that gets me chuckling is the 07 600RR hype about the high rwhp numbers that every motorcycle rag was publishing - all of them were over 100rwhp and most were above 110.  This translates into a 3-15% variance in reported horsepower.  Thats a lot of variance without even getting into how many standard deviations we're talking.
 
97rwhp out of a totally redesigned 'superbike' still sucks, I don't care whose dyno it is.

"Technically accurate"... "Dorks, drilling out there baffles"!!!!!
I'm glad you were able to figure out, the "mispelled" word... now, go look it up...
We had another "dork" on the CBR forum, a couple of weeks ago... saying there would be no concerns about "power"... after he cut his can off and added a goofy forked car/truck tip... plus, his "friends," all said it was "cool"
Funny, to see some things don't change in 50 years... sad, but funny. Ya, all ya need to do, is cut out them baffles!!!!!  All those useles pipe/ can manuf., will be outta biz shortly... after the "truth" gets out !!!!!!!!
Free and clean,    Ripp'n

      baffles are just sound restrictions

i guess you didnt see the dyno chart where i did gain a little after the baffle was drilled out

or are you too stupid to believe what your eyes are telling you

and what is the big deal about a "brand new superbike" putting out only 97 hp

its a 600 what do you expect

599cc will only put out so much with all the restrictive exhausts and baffles choking it down

a good full system is netting 115 according the guys on 600rr.net which is creeping into the rc51 range

god what a forum full of idiots

(the misspelled word comment was a dig to deliberalty piss you off just because i can)

 

Oh my, I missed the 1hp gain.  Excellent mod!  I was so wrong to question not only mutiliating stock equipment for awesome hp gains, but the most impressive rwhp numbers on your motorcycle.
 
Ha!  A 1hp delta - that's well within the sampling error of any dyno.
 
Methinks there is just one idiot posting on this thread, and the name starts with 'b' . . . . .

Here Here... HAHA HEHE... my spelling/gramatical errors, are Well known..
WHATS NEW !!!!
 I get a kick,  that somehow it's notice, will less'n  the recognition  of the lack of understanding/knowledge, you are so so eager to portray/defend/ proliferate (sad part)!!!!!!
Whats w/ the  statment about "baffles, only for sound..."... then a couple sentances later... "599cc will only put out... choked down by baffles."    Say, you are lost, aren't you. Are you saying that baffles DO, affect power???... or that the nasty sound demons, are to blame... DORK !!!!!!!

I get a real kick out the self proclaimed exspert, You... w/ useless dyno sheet, to "back you up"... and your severe underestimation, about being just,"a bit", of a jerk !!!!!!!!! Well MR. B... here you are, defending your position and prowess, on a proper way, to improperly, mod an exaust, by drilling out baffles....HAHAHA.. not even close to a defendable position, by anyone having a clue about exaust dynamics!!!!!
I find (as others do, also) your ending statment...
"A Fiat (triumph), of self illumination."
Now go put those clothespins and playing cards ... to compleat YOUR mods.
I think "D-R-K-T-U-N-R", would make a nice personal plate, for ya too!!!!!!!
Free and clean,   Ripp'n

quote:

I'm going to try and remove the whole baffel pretty soon, I'll let you know how that turns out, and I'll try and get some pictures up soon.

You may run into a lean condition with this, think about taking a look at the plugs after 100 miles or so.  At least if you screw up things a little, you can then either buy a aftermarket can or a used stocker and start over.  Good luck with it.

Way to go527 !!!!!!!! Now thats how I should be acting !!!!!!!!   Mr B... I'm sorry for all the flack, especialy the personal stuff. I'm sure your a nice guy, just trying to be of  help. The tech reasons,  stand for themselves... I dipp'd mighty low to flame you...WD. SORRY.
Now about that E-XUP flapper valve... I think it was yamahas intent to provide a backpreasure change to promote torque, honda thought it was a great working idea too.. I don't understand the "epa" reasoning... for noise? As any backpreasue increase, tends to rich'n (not epa friendly) The change in revision, does alter the "wave length" of the exaust, scavenging, in the combustion chamber, between the valves and carbs/inj, backside of fueling... to airbox. Sometimes even reversing the intake wave... refueling it 2x+ richer... These were all fairly dramatic considerations, in the 70's/80's... being behind "soggy bottoms, nonexistant midrange, dead top ends", when people did "backyard mods" to exausts(usualy 86 baffles) and hung "pods" on. Though, that period was the "hayday" for discovery  of "why, it does that," the answers are still sound(haha), and readily available, to the interested backyard tunner.  I got into revision, as a kid, reading all I could in bike rags... then thinking... I can do that... Oh MY GOSH!!!!   What a mess... It is truely amazing how much a "lip" hear and "an inch out of there" will change the wave length... as I said, possibly changing, all kinds of things.   Thinking, "I was much smarter now" went to work, building cans for a 84 vf1000f...  I think that was the beginning of insomnia, in my life!!!!  Baffle diameter/ length/ configuration, can intake/body transition, exaust tip dia., overall can length... the list just ...gets LARGER !!!!!!!!!  I really recomend ALL, to read up on "ex. revision", it is absolutly fascinating !!!!!!
There's a new thread ...on nock'n outbaffles!!!!!  I promise to be technicaly accurate, firm, but humane... Round II... DING !!!!!! just kidding !!!!
Free and clean,      Ripp'n

I was just reading the post on removing baffels becuase I was thinking about trying it but now i'm not sure if  I want to but it was fun to follow.

18hp jump going from "punched out baffles" to a full system would be a nice gain - id love a 20% horsepower gain for some plumbing.  but i still have to wonder about the big variation between the generally accepted power and what that one made.  i'm also having trouble understanding your comment about rc51 range.  i haven't researched the rc51 at length, but i'd be willing to bet that the powerband of the rc51 is completely different from the powerband of a 600rr, and really shouldn't be compared.  also, not to call you an idiot, but i just wanted to make sure you knew that there are other things to consider than the little number marking the peak on your dyno chart.  how often do you actually use that much power on the street? and would you really notice a difference of less than 1 horsepower at that rpm? i'd be more inclined to believe that dyno chart if there were 3 runs before and 3 after - so many variables can cause that tiny variation that one run each really wasn't enough testing to validate the findings.  but when it comes right down to it, it's your bike, so if you can stand the raspy noise and the backfiring, then have at it.  by the way, how much time overall did you spend researching, modifying, and testing your exhaust system? had you spent that time making money, you could have bought yourself that full system :)

Edit: i just realized i posted my reply after reading the first page, and in the second page, other people said it better than i possibly could.  why don't we sticky this thread?

quote:

ORIGINAL: fishnride

Hahahahah - 97rwhp out of an 07 600RR?!?!?  Damn - that sucks.

My wife's stock 05 600RR just dyno'd the other night at 101.4rwhp.  The hottest bike done that night was a new ZX14R that put out 161rwhp.

You guys should know by now not to compare dynos by now same bike will dyno different at different dynos, that is why you always should dyno at the same dyno. All company calibrate their dynos different and you never know if the shop even calibrate their. My brother bought a new dyno and it was giving us a different # on the same bike this was done back to back.

I do have a question.....Ripp'n, i've always found your posts very informative, and you seem to always know what you're talkin about, so please don't take this question as trying to undermine your statements. I was just wondering about whether there really is that much of a difference between a stock exhaust with baffles drilled out compared to most slip-ons today. The majority of slip-ons for our bikes don't even HAVE baffles...i know on my old jardine you could look right through the thing. It would seem to me that this would provide even less backpressure than a drilled stock pipe. I don't know a whole lot about exhaust, just makin a observation. Care to elaborate???

-Adam

Well, I'm no expert in the matter of exhaust flow dynamics, but I cut the baffels out of my bike. I also saw an increase on the dyno. only about 1.5hp. The real gains did not come around until a friend with an exhaust shop and an engineering degree designed and built me a custom pipe, no baffels no can, just straight through and louder than the hammers of hell. I also picked up 5.1 ponnies, Then add a head job and a power commander and velocity stacks, i dyno'd 114.2  

Ol boy just wanted his bike to be a little louder.  Yall didn't havta jam him up that hard.  If you're balling on budget just go for it.  You're not gonna jack your bike up to the point where is completely ruined.  You might lose a little bit of torque/horsepower but as was stated earlier, "how often do you  really use that peak horsepower on the street?"
 
He came, he asked a question, got a couple positive responses and went ahead with knocking his baffles out.  He got his desired result of being louder and didn't seem to notice much on the torque/horsepower side of it. 
 
Its not that serious, let it ride.