Author Topic: could an exhaust shop bend a new set of pipes? (Read 3348 times)

1981cb650c · « **on:** March 14, 2009, 10:52:47 PM »

Would a set of headpipes be beyond the ability of a custom exhaust shop? (not your corner "joes exhaust") Would it even be economical? I have a set of individual head pipes (4-4 that had been chopped and once had a mac 4-2 slipon) to use as a pattern, could they be copied? and finally, would they be able to mandrel bend them one piece without welding or just traditional exhaust bends?

No reproduction exhaust exists for a 650:( I would be looking at fabing up a set of 4-4, if I can get the pipes bent, and getting the whole thing ceramic coated once I have everything fited and welded. I would use these mufflers (see DeeeeLux megaphone) - http://www.jrbranson.com/BikeParts/CDR-Parts.htm

mrbreeze · « **Reply #1 on:** March 14, 2009, 11:12:21 PM »

Someone should be able to do it but the ? is who.There just isn't a whole bunch of people offering pipes for these bikes.I dug watching Jesse James make pipes for Harleys but I'd bet those wouldn't come cheap.

Soos · « **Reply #2 on:** March 15, 2009, 12:06:02 AM »

You still looking for a set of 4-4's huh?

I got a set of 4-1's if interested.

l8r

Hush · « **Reply #3 on:** March 15, 2009, 01:45:17 AM »

Would not be economically feasible here in NZ but anything is physically possible if you ahve the $$.
I looked long and hard at this when trying to find pipes for my 650, ended up getting off Ebay, matter of waiting for the right set to appear, I missed out on 3 sets before I won a set I liked.

DollarBill · « **Reply #4 on:** March 15, 2009, 06:31:21 AM »

I think these guys have all the pieces to make your own...you just have to weld them together.
http://www.megsexhaust.com/conical_products.html

masonryman · « **Reply #5 on:** March 15, 2009, 06:41:17 AM »

I went to a corner muffler shop and ask them to make me 6 bends out of one piece of pipe, 4 as short and tight as possible, 2 just short of 90deg. cut it up and weld it together and this is what I got

The biggest problem you will come across is the flange at the head.

Mark

masonryman · « **Reply #6 on:** March 15, 2009, 06:46:24 AM »

This is the first mock up, it has been tweaked and now that the details are worked out a stainless set is in the works

Mark

MJL · « **Reply #7 on:** March 15, 2009, 07:32:11 AM »

That's damn sweet, but for God's sake put some paint on that bike!

masonryman · « **Reply #8 on:** March 15, 2009, 07:46:38 AM »

Quote from: MJL on March 15, 2009, 07:32:11 AM

That's damn sweet, but for God's sake put some paint on that bike

It spent last winter in an unheated building, everything in the building just sweated like crazy.

Paint starts this week I have most issues worked out. it's time to start puttin it together.

754 · « **Reply #9 on:** March 15, 2009, 08:47:50 AM »

That looks really good.

Most muffler shops cant helput , much.
First the benders they use tend to squash the pipe (unless they have manderel benders). Second it is really time consuming.

Even if they have manderel equipment, they still need the right size and radii.

For most people, do what the masonryman did on his, Bend templates out of copper tubing or alum fuel line, then go to the shop, and get pieces bent. Then spend a lot of time fitting and tweaking, and be prepared to cut off the head parts off another pipe set.

It can be done, but his route seems the best, shop rates will kill you and they may not know what you mean or like.

There are shops that can do this work on a custom basis, but they are far & few between.. usually busy, & pricey..

VitaminCB550 · « **Reply #10 on:** March 15, 2009, 08:54:34 AM »

Quite a beautiful exhaust...

I finally put on the 4-2 mac that I bought from a kind member here and was unimpressed. I don't have the funds to do what you did... but would definitively like to!

If you don't mind me asking... How many hours/how much?

masonryman · « **Reply #11 on:** March 15, 2009, 09:15:56 AM »

Around a $100.00 in pipe and bends, I had very little time in it at first, where it sets in the first pic (2 or 3 hours) When I started making the mufflers and baffles and getting it to fit like in the last couple pics I have lost track of all time on all aspects of this bike.

I have a cousin that builds race cars, he has a mandrel bender and a tubing notch-er, seems to think with the pattern built we can duplicate them in a couple hours.

Tower · « **Reply #12 on:** March 15, 2009, 10:00:55 AM »

Great idea @masonryman and a nice looking result. How did you get the physics worked out? i.e. diameter of head pipe in relation to exhaust port size, diameter of collector pipe in relation to header flow volume, tuned length?

masonryman · « **Reply #13 on:** March 15, 2009, 10:23:48 AM »

huh, big pipe flow good.

no really, I used the largest pipe I could and kept the lines as clean as possible, everything else was about looks and keeping it close to the bike.

It is 1-1/2 automotive exhaust pipe and the I.D. is larger than the exit of the exhaust ports so I really don't think flow is a problem, although I do anticipate a progressive leaning problem the higher the RPM's especially with out the baffles

nokrome · « **Reply #14 on:** March 15, 2009, 12:27:47 PM »

very nice work!! i also like the metal seat cowl.....it will be interesting to see how those pipes work out
ever think about doing a yosh style 4-1?

masonryman · « **Reply #15 on:** March 15, 2009, 12:46:13 PM »

I am supposed to pick up a bone stock 550 Super Sport, I have thought of using the bike as a template to build some parts for stock bikes.

Peterbylt · « **Reply #16 on:** March 15, 2009, 04:47:40 PM »

Randall Washington the King of old Goldwings at Randakk's Cycle shack has produced a set of 4 into 4 mufflers for the GL1000 that look suspiciously like the CB750 4 into 4 pipes. The price is a little over the top but they do look incredible on an old wing. They are ceramic coated inside and out and come in a couple of different finishes, Maybe you could contact him, I'm sure if the market was there he would have a set fabricated for the SOHC4's. Most of the work is already done all that would be needed is the header pipes. In the Goldwing world Randakk is very highly thought of and all his parts are of the very highest quality.

http://www.randakks.com/4-into-4%20Megahone%20Exhaust.htm

Peter

vames · « **Reply #17 on:** March 15, 2009, 05:15:41 PM »

Hey Masonryman -- you are one of a few who I've seen develop an under-seat exhaust outlet (modern sport-bike style). I'd like to respectfully inquire why. I'd guess it was for clearance, but the pipes seem to go close enough to the ground under the engine that some upturned cans really wouldn't be in the way. Wouldn't the extra length of the exhaust pipe to get it up there be a negative factor for the overall system? Won't it also put a lot more noise a few feet closer to your ears?

Mark
[/quote]

masonryman · « **Reply #18 on:** March 15, 2009, 06:01:36 PM »

There are several reasons, not the least of which, because I wanted to see if I could make it work.
The bike has tons of ground clearance so that's not a problem.The pipes not only have very little back pressure they are pretty quite even with out the baffles, with the baffles the motor noise is nearly as loud as the exhaust.

One of the biggest reasons was handling, I put a light weight 4 into 1 on my Ninja and I could not believe the difference in cornering and breaking. The width of the 4 into 2 and 4 into 4 systems work like outriggers, they make the bike more stable but harder to throw around.

lastly, it will probably never happen but, where the pipes come threw the swing arm would be a good place to put a turbo centered up right behind the carbs

Mark

mystic_1 · « **Reply #19 on:** March 15, 2009, 09:32:32 PM »

"Why climb the mountain?"
"Because it is there."

- Sir Edmund Hillary

mystic_1

streetsports · « **Reply #20 on:** April 01, 2009, 06:14:10 PM »

this is the place to get ahold of ...they do exactly what you need
http://www.mandrel-bends.com/catalog/index.php?ref=1&affiliate_banner_id=2

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Author Topic: could an exhaust shop bend a new set of pipes? (Read 3348 times)

1981cb650c

masonryman

masonryman

masonryman

VitaminCB550

masonryman

masonryman

masonryman

masonryman

streetsports