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Author Topic: CB450 Tracker  (Read 3439 times)

Offline 1fasgsxr

  • Posts: 1151
Re: CB450 Tracker
« Reply #40 on: Nov 15, 2017, 10:24:15 »
Looking good.. perfect lines on the exhaust

Offline Pete12

  • Posts: 57
Re: CB450 Tracker
« Reply #41 on: Nov 17, 2017, 00:51:43 »
Looking good.. perfect lines on the exhaust

Thank you and thanks for following along.

As I am building a 2 into 1 system I need to make a collector to transition between the two. Bell's book suggests a collector taper of 7-8 degrees (not that it's going to be a race bike, but it may as well be done somewhere near right), so I developed the pattern in AutoCAD. Even though it takes time it's still a whole lot better than taking to the bare metal with the marking blue, divider, ruler and scriber, imho.
https://i.imgur.com/nYmTlhG.jpg[/img]]
Once that was done I isolated the pattern outline and converted it to a BMP file. I then imported that into my sticker cutter (another great toy that I was lucky enough to buy, without any possible hope of payback), and cut the pattern.
https://i.imgur.com/WAjT4bj.jpg[/img]]
I then stuck the pattern onto a bit of old body steel, and cut around it with the snips.
https://i.imgur.com/mWmgxWm.jpg[/img]]
https://i.imgur.com/BiZST2p.jpg[/img]]
I then welded the seam and rolled it up around a bit of pipe in the vice, and it fits pretty good.The steel I used is quite rusty so I'll get a new sheet next week as I still have the rest of the megaphone to manufacture.

Offline cxman

  • DTT SUPPORTER
  • *
  • Posts: 2354
Re: CB450 Tracker
« Reply #42 on: Nov 17, 2017, 08:51:47 »
what size is your main pipe and mandrel bends
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline Pete12

  • Posts: 57
Re: CB450 Tracker
« Reply #43 on: Nov 17, 2017, 10:45:16 »
what size is your main pipe and mandrel bends

Pipe ID about 38mm.

Offline Pete12

  • Posts: 57
Re: CB450 Tracker
« Reply #44 on: Nov 18, 2017, 20:23:13 »
Can't do much until I get some body steel so I milled some slots in the two countershaft sprocket covers. I'll let my brother decide which one he wants to go with and he if he doesn't like either then new s/h covers are plentiful and cheap  :D

Offline Pete12

  • Posts: 57
Re: CB450 Tracker
« Reply #45 on: Nov 23, 2017, 22:40:50 »
Finally got around to making the new collector and fitted it up. I also dressed all the welds on the joins and it came up OK.
https://i.imgur.com/JmEFoDx.jpg[/img]]

Cut some more body steel and welded and rolled up a 50mm tube for the next part of the exhaust.
https://i.imgur.com/YSGyLLn.jpg[/img]]
https://i.imgur.com/RCzhmfp.jpg[/img]]

I then cut and tacked some segments for the bends
https://i.imgur.com/QUSYjrT.jpg[/img]]

Once that was done I fitted the pipes and taped the joins together to ensure the fit was OK.
https://i.imgur.com/ZzvFJtC.jpg[/img]]

I will make the megaphone next, mock it all up and once I'm happy with the fit, weld it all together. When that's finished I'll make and install the baffle and then move on to the tank.

Offline JadusMotorcycleParts

  • DTT SUPPORTER
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  • Posts: 791
    • Jadus Motorcycle Parts
Re: CB450 Tracker
« Reply #46 on: Nov 26, 2017, 16:05:54 »
Looking awesome!  That rolled collector came up amazing.  Cool technique.

Offline Pete12

  • Posts: 57
Re: CB450 Tracker
« Reply #47 on: Nov 27, 2017, 03:18:59 »
Looking awesome!  That rolled collector came up amazing.  Cool technique.

Thanks very much for the positive feedback.

Printed up some sticker templates today for the megaphone and reverse cone so I should be able to get that done in the next couple of days. Even without the sticker maker it's very easy to draw the pattern for a cone directly onto the body steel, this just makes it a little easier and quicker
https://i.imgur.com/Z36deQr.jpg[/img]]

Also made a couple of stickers to be placed discreetly on the swing arm  ;D ;D


Offline Pete12

  • Posts: 57
Re: CB450 Tracker
« Reply #48 on: Nov 28, 2017, 05:49:36 »
Put the stickers on the body steel and cut around them ready for rolling and welding.
https://i.imgur.com/6kLxzp3.jpg[/img]]
Before I get onto that I want to finish the headers so I finished welding the sections together, which are just fuse welded with the oxy/acetylene.
https://i.imgur.com/Ks3bHcw.jpg[/img]]
There is a bit of undercut but the penetration is really good and it just leaves a nice neat bead around the inside of the weld.
https://i.imgur.com/IuXewPe.jpg[/img]]
I've been building two stroke pipes for a long time now and never had one so much as crack, so it works for me. :o

Offline Luugo86

  • Posts: 644
  • '73 CB350, '78 XS650 Cafe Killer
    • ToadStool Cycle Co.
Re: CB450 Tracker
« Reply #49 on: Nov 28, 2017, 12:24:28 »
Nice welds, I like using the oxy/fuel rig for stuff like this. I like where this project is heading.
Live to Die, Die to Live