Author Topic: 4 into Straight pipe?  (Read 5722 times)

0 Members and 3 Guests are viewing this topic.

Offline Chris Schneiter

  • Hot Shot
  • ***
  • Posts: 586
    • Christopher Schneiter Photographer
4 into Straight pipe?
« on: August 30, 2006, 11:57:51 AM »
Has anyone gone to an open pipe? I know there has to be someone in this bunch of yahoos! I have 4 into Kerkers (I think) and ever since I heard a Valkerie with 6 straight pipes, I can't get out of my head what my 750 might sound like. My muffler bolts on just behind the footpegs. The junction is about a 2" pipe. I was thinking that I might be able to just bolt a 2" pipe on and run it all the way back. I've heard smaller pipes, but I thought  leaving it big would make it throatier.
CB750 K6

Offline Jeff

  • Hot Shot
  • ***
  • Posts: 452
Re: 4 into Straight pipe?
« Reply #1 on: August 30, 2006, 12:29:20 PM »
I have a 4 into 1 Mac without the baffle. Not quite straight pipes, but still pretty dang loud.

I don't care for the sound honestly. It's too loud, although the wail it puts out at 6000 rpm sounds kinda cool, like I'm being chased by a swarm of hornets.

Jeff

Offline STLrocker

  • Enthusiast
  • **
  • Posts: 181
  • whiskey bent and hell bound
Re: 4 into Straight pipe?
« Reply #2 on: September 01, 2006, 10:03:53 PM »
i have run my 4-1 with an open megaphone on it before. it didnt sound too bad or too loud. i usually run it with just a louvered baffle in it to lengthen the collector outlet while keeping the inside dameter small.. it sounds just about as loud only it puts the power band lower which is much more useable.

if you have a collector with a 2" outlet and you install straight pipe. you may want to play with the length and inside diameter to find the best power band. i cant remember the I.D. of the baffle in mine. other wise, go for it.

i also have 4-4 open drag pipes on my 750 chopper. it is loud but not overbearng. ive heard louder. it sounds great a WOT accelerating.

Ratfink

  • Guest
Re: 4 into Straight pipe?
« Reply #3 on: September 01, 2006, 10:11:00 PM »
Im running a 4-1 with a six inch exhaust cap from the auto parts store, no baffle at all.  Check my gallery. Im not sure how its affecting my performance though...... ???

Offline ProTeal55

  • Old Timer
  • ******
  • Posts: 4,887
  • Est1968.com
    • Joe's Barbershop Chicago
Re: 4 into Straight pipe?
« Reply #4 on: September 01, 2006, 10:43:02 PM »
Running a MAC 4 into 1 with no baffle.
Sounds killer - like a race bike making some killer power.
Nothing beats the racket it makes while downshifting thru the gears.
I am sold on the open exhaust, as baffles are for women... ;D
Joe a.k.a ProTeal55 a.k.a JoeyCocks a.k.a Maker of Friends

Ratfink

  • Guest
Re: 4 into Straight pipe?
« Reply #5 on: September 02, 2006, 08:52:55 AM »
Mine sounds cool as hell. I must not care what my neighbors think.

Offline 74cb750

  • Old Timer
  • ******
  • Posts: 3,420
    • old japanese parts and bikes
Re: 4 into Straight pipe?
« Reply #6 on: September 02, 2006, 12:31:55 PM »
Rebel ! Rebel ! Rebel!
Laugh at least once a day.
Life  $ucks, then you die.
You are entitled to your own opinions, but not your own facts.
God forces us to live with  non-believers to test our resolve.

Ratfink

  • Guest
Re: 4 into Straight pipe?
« Reply #7 on: September 02, 2006, 05:26:33 PM »
I must not care what my neighbors think.

This means you are a rebel.

#$%* yea!! On a Honda. . . . .Is that an oxymoron?

Offline ProTeal55

  • Old Timer
  • ******
  • Posts: 4,887
  • Est1968.com
    • Joe's Barbershop Chicago
Re: 4 into Straight pipe?
« Reply #8 on: September 03, 2006, 12:07:36 AM »
I for one believe that a loud bike is a safer bike, as i would rather have the person in the car next to me roll their window
up because my bike is "too loud" , then turn into me becasue they didnt even know I was their. I have felt this way for a long time.

My 4 into 1 makes my little CB sound like a racebike, and actually have yet to be pulled over becasue of it. If you dont drive like a jag, you wont get pulled over, simple as that. And if you do little things like kill the bike while pulling into your garage late at night to be quite, you wont piss off your neighbors.
Joe a.k.a ProTeal55 a.k.a JoeyCocks a.k.a Maker of Friends

Offline DarkRider

  • Nomad.or Drifter...Def not a
  • Old Timer
  • ******
  • Posts: 2,611
  • Lone Wolf.....Among the herd of sport bikers...
Re: 4 into Straight pipe?
« Reply #9 on: September 04, 2006, 08:54:09 PM »
how well does that Mac work for you proteal? I was reading your exhaust thread earlier and was considering that option since it seemed to be a reasonable price for the set up. If i dont go 4 into 1 im thinking i will keep it 4 into 4 with straight pipes laid out in the same style as the stock exhauist.
'84 Chevy C10
'73 MGB Roadster
'69 Ford F250

Currently a rider without a bike

Quote from: heffay
so, you say just tie myself on with this... and steer w/ this?   ;D ;D  ok.  where's my goggles?   8)

Offline nickjtc

  • I was numero dieci
  • Old Timer
  • ******
  • Posts: 4,210
  • Yamaha XT500 'Gromit'
Re: 4 into Straight pipe?
« Reply #10 on: September 04, 2006, 09:10:43 PM »
I for one believe that a loud bike is a safer bike, as i would rather have the person in the car next to me roll their window
up because my bike is "too loud" , then turn into me becasue they didnt even know I was their. I have felt this way for a long time.

Ummm...this is going to sound like another Nick-the-GHOF-safety-nerd diatribe.....but anyway, here goes.

There is no evidence, zero, nada, that a noisy vehicle, be it a motorcycle, car or whatever, is less likely to be involved in an accident. At no point in the Hurt Report does it say that the noise a machine was making, or not making, had any bearing on the fact that it was involved in an accident.

The reality of life, like it or not, is that noisy vehicles just piss people off, and in the long term lead to a reduction of rights and priviledges. Witness the fact that several subdivisions in Vancouver have banned motorcycles because of the actions of an inconsiderate few who thought it appropriate to ride un-muffled in the middle of the night.

To those who think that open pipes are appropriate because they warn people of the impending arrival of said bike, my personal response would be that the pipes should be artistically re-shaped to point forwards since most of the noise emanates to the side and rear, not to the front.

Loud pipes do not save lives. Loud pipes lose rights.

I know I'm not going to make any friends by saying this, but I believe that anyone who does anything to diminish the profile of motorcycling, either by acting irresponsibly while riding or by making anti-social modifications to their bike, is not doing the rest of us any favours........

Let the abuse begin!
Nick J. Member #3247

2008 Triumph Tiger 1050
1977 Suzuki GS750

"That which does not kill us reminds us to wear proper motorcycle clothing...."

ElCheapo

  • Guest
Re: 4 into Straight pipe?
« Reply #11 on: September 04, 2006, 09:27:47 PM »
I do not know about 4 into 1 on a 750 that is open, but I can tell you noone but none dislikes the sound of 2 into 1 duals on home wrecker which have no real baffle. The only baffle is a large washer that has a tube shoulder welded to it and then screwed to the pipe like a normal baffle end. This thing sounds extra nasty. VEE DONT NEED NO STINK'IN BAFFLES  :D ;D

Really this thing sounds real nasty in close quarters (like in the shop), on the road it is not all that bad. Not enough to make the local law complain as I have had them listen to it to make sure. You have to stay within the law so as to not make enemies.  ::) SO on a few levels nickjtc I am on your side on this issue. A bike can be somewhat loud and sound nasty without pissing everyone off at once. There are always a few that just can not be helped.  :D
« Last Edit: September 04, 2006, 09:31:20 PM by ElCheapo »

Offline DarkRider

  • Nomad.or Drifter...Def not a
  • Old Timer
  • ******
  • Posts: 2,611
  • Lone Wolf.....Among the herd of sport bikers...
Re: 4 into Straight pipe?
« Reply #12 on: September 04, 2006, 09:42:42 PM »
Hey elcheepo do you still have that F header you were going to sell to proteal? im thinking i might be able to adapt it to my K by cutting off the down pipes and welding it to my downpipes...seems simple enough to me anyways...
'84 Chevy C10
'73 MGB Roadster
'69 Ford F250

Currently a rider without a bike

Quote from: heffay
so, you say just tie myself on with this... and steer w/ this?   ;D ;D  ok.  where's my goggles?   8)

Ratfink

  • Guest
Re: 4 into Straight pipe?
« Reply #13 on: September 04, 2006, 09:56:08 PM »
I ran my 750 without headers at all the other day in the garage. Sounded like a lawnmower. . . . I hate it when my neighbor mows his lawn first thing saturday morning. I might request that my neighborhood association ban lawns.
« Last Edit: September 04, 2006, 09:57:40 PM by Ratfink »

Offline pmpski_1

  • Hot Shot
  • ***
  • Posts: 431
  • Beast V and Beast I
    • My CB550 related blog on MSN Spaces
Re: 4 into Straight pipe?
« Reply #14 on: September 04, 2006, 10:23:58 PM »
The only baffle is a large washer that has a tube shoulder welded to it and then screwed to the pipe like a normal baffle end.


Can you post some detailed pics of this? I have some drag pipes with no baffles and my dad was talking about doing this with the washers. He mentioned them being on a pivot so you could open them up or have them provide more of a baffle. Sounds interesting.
Beast   I: 1974 CB550K
Beast IV: 1976 Chevy Blazer
Beast  V: 2003 Buell XB9S

Offline Jeff

  • Hot Shot
  • ***
  • Posts: 452
Re: 4 into Straight pipe?
« Reply #15 on: September 05, 2006, 06:03:00 AM »
Ummm...this is going to sound like another Nick-the-GHOF-safety-nerd diatribe.....but anyway, here goes.

There is no evidence, zero, nada, that a noisy vehicle, be it a motorcycle, car or whatever, is less likely to be involved in an accident. At no point in the Hurt Report does it say that the noise a machine was making, or not making, had any bearing on the fact that it was involved in an accident.

The reality of life, like it or not, is that noisy vehicles just piss people off, and in the long term lead to a reduction of rights and priviledges. Witness the fact that several subdivisions in Vancouver have banned motorcycles because of the actions of an inconsiderate few who thought it appropriate to ride un-muffled in the middle of the night.

To those who think that open pipes are appropriate because they warn people of the impending arrival of said bike, my personal response would be that the pipes should be artistically re-shaped to point forwards since most of the noise emanates to the side and rear, not to the front.

Loud pipes do not save lives. Loud pipes lose rights.

I know I'm not going to make any friends by saying this, but I believe that anyone who does anything to diminish the profile of motorcycling, either by acting irresponsibly while riding or by making anti-social modifications to their bike, is not doing the rest of us any favours........

Let the abuse begin!

+1    I agree 100%.

Jeff

ElCheapo

  • Guest
Re: 4 into Straight pipe?
« Reply #16 on: September 05, 2006, 06:38:58 AM »
Hey elcheepo do you still have that F header you were going to sell to proteal? im thinking i might be able to adapt it to my K by cutting off the down pipes and welding it to my downpipes...seems simple enough to me anyways...

Cuting them off and re welding makes way more work than you have to. Just simply remove the spigot tubes with your impact driver and install all the later model exhaust stuff. I guess if someone was to be super stubborn they could cut off just the lip part of the pipe and use a pipe expander on them to make them fit on a spigot type exhaust. Anyway, yes I still have them.

The only baffle is a large washer that has a tube shoulder welded to it and then screwed to the pipe like a normal baffle end.


Can you post some detailed pics of this? I have some drag pipes with no baffles and my dad was talking about doing this with the washers. He mentioned them being on a pivot so you could open them up or have them provide more of a baffle. Sounds interesting.

I can post pics later, The pivot would just be a pain in the ass. You have to think of function and longevity on this one.

You will need:
1. Washer that is 1/16"O.D smaller than the I.D. of your host pipe or just a bit bigger as it can be ground to size.
2. A piece of exhaust pipe that will slip in the host pipe. This needs to be a snug fit but not one you have to hammer it in.

1. Cut the baffle pipe so it is about 1 1/2 inch long (making a collar)
2. Now if the pipe is too small to fit snugly in the host pipe then make one cut across the 1 1/2 length so that it can be opened up to the right size. Add any filler metal that is needed to make it fit and weld the collar back together.
3. Now weld the washer to the end of the collar and grind as needed for fitment.
4. Slip the baffle inot the pipe the desired distance.
5. Take your measurements of how far in it is and add 3/4" and drill the host pipe in atleast 2 spots (I use 3) and install sheet metal screws and touch up with stove black.

It sounds hard but this is EASY, You are making a 1 1/2" tall can with a 1"-1 1/4" hole in the bottom.




Offline nickjtc

  • I was numero dieci
  • Old Timer
  • ******
  • Posts: 4,210
  • Yamaha XT500 'Gromit'
Re: 4 into Straight pipe?
« Reply #17 on: September 05, 2006, 08:11:33 AM »
SO on a few levels nickjtc I am on your side on this issue. A bike can be somewhat loud and sound nasty without pissing everyone off at once. There are always a few that just can not be helped.  :D

I agree totally. There is (in my opinion) nothing wrong with a fruity exhaust which has a nice sound to it, without being obnoxiously loud.
Nick J. Member #3247

2008 Triumph Tiger 1050
1977 Suzuki GS750

"That which does not kill us reminds us to wear proper motorcycle clothing...."

Offline Chris Schneiter

  • Hot Shot
  • ***
  • Posts: 586
    • Christopher Schneiter Photographer
Re: 4 into Straight pipe?
« Reply #18 on: September 05, 2006, 08:24:38 AM »
Yeah! I just like the sound of more than two cylinders going into straight pipes! That Valk I've been following around just sends chills down my spine!
CB750 K6

Offline cbjunkie

  • Master
  • *****
  • Posts: 2,346
  • ...know what i'm sayin'?
Re: 4 into Straight pipe?
« Reply #19 on: September 05, 2006, 08:26:00 AM »
as EHL said - i too am a "street idler" down my block anyway  ;D - there is a killer neighborhood twisty set about a half a mile from my place that calls to me pretty often as a "last fun of the night" type of ride before coasting down my quiet little street and snikking into the drive...i'm sure i've made no friends on that street, but honestly, the houses are sooo big on that street i'm sure the sound can barely penetrate the 16 inch thick masonry that most of them are made of...
1971 750K1
1972 CB350 (deceased)

sometimes naked, sometimes mad -
now the poet, now the fool -
thus they appear on earth,
the free men.

Offline Rushoid

  • Shameless
  • Expert
  • ****
  • Posts: 1,260
Re: 4 into Straight pipe?
« Reply #20 on: September 05, 2006, 08:57:56 AM »
I must not care what my neighbors think.

This means you are a rebel.

#$%* yea!! On a Honda. . . . .Is that an oxymoron?
Nope, that's redundant. 8) An oxymoron would be someone who buys a Harley because he want to be different.  ::) ;D

My lawnmower is louder than my bike. Kohler twin with blown mufflers! Funny how much it sounds like a Harley. I'm sure the neighbors hate it, but they haven't said anything.

Nick, I agree. I've always wondered how loud sounds behind the bike could be life saving.
Go Cards!! Go Colts!! Go Bucks!!

SOHC/4 Member #3452

winston

  • Guest
Re: 4 into Straight pipe?
« Reply #21 on: September 05, 2006, 11:03:04 AM »
I sometimes wish my original 4-into-4 exhaust were a bit beefier sounding, but then again, I like having and putting the bike as near to stock as I can get it.

As it is I've learned to enjoy the induction moan under stiff acceleration and the sound of the chain on the sprocket...one of the selling points of the '77 K was how the new exhaust was quieter than ever and they were right...it's a very quiet bike for its size.

My friend's '81 CM400e by comparison is a noisy bugger, and when we go to coffee shops where bikers congregate I often can't tell if my bike's running at all over the sound of his bike backfiring along with all the big v-twins around.

Offline nickjtc

  • I was numero dieci
  • Old Timer
  • ******
  • Posts: 4,210
  • Yamaha XT500 'Gromit'
Re: 4 into Straight pipe?
« Reply #22 on: September 06, 2006, 02:56:46 PM »
I think there's some merit to the argument that Pro Teal poses. Exhaust exits the rear of the bike but it makes the bike louder from a distance, period. 

True. But by having loud pipes everyone gets to hear you, not just the idiot who is trying to cut you off, or who is pulling out in front of you. A good loud air horn works better (points forward) and you get to choose exactly when you want to make a "wake up, you idiot"  noise.
Nick J. Member #3247

2008 Triumph Tiger 1050
1977 Suzuki GS750

"That which does not kill us reminds us to wear proper motorcycle clothing...."

Ratfink

  • Guest
Re: 4 into Straight pipe?
« Reply #23 on: September 06, 2006, 03:19:18 PM »
Sound travels in all directions.
Faster than you can ride.

Offline pmpski_1

  • Hot Shot
  • ***
  • Posts: 431
  • Beast V and Beast I
    • My CB550 related blog on MSN Spaces
Re: 4 into Straight pipe?
« Reply #24 on: September 07, 2006, 08:06:38 AM »
I can post pics later, The pivot would just be a pain in the ass. You have to think of function and longevity on this one.

...

It sounds hard but this is EASY, You are making a 1 1/2" tall can with a 1"-1 1/4" hole in the bottom.

No need for pics, these instructions are great! Pretty straight forward.
Beast   I: 1974 CB550K
Beast IV: 1976 Chevy Blazer
Beast  V: 2003 Buell XB9S