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Pie cut exhaust

This is a discussion on Pie cut exhaust within the Technical forums, part of the Caferacer.net Forums category; Some people will build a turntable type of setup and a stay for your hand holding the torch and get perfect welds on these. Skip ...

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Thread: Pie cut exhaust

  1. #41
    jcw
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    Some people will build a turntable type of setup and a stay for your hand holding the torch and get perfect welds on these.

    Skip to 1.30
    https://m.youtube.com/watch?v=FZ8CGGYamuE

  2. #42
    jcw
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    Coming along OK.

    The comment I made about making sure you match the cut angles is not really possible unless you are absolutely perfect guessing the angles needed and perfect in the assembly of the wedges. Which I am not.

    So, in the assembly, there is some rotating of the segments to fit the path you want for the exhaust as close as possible. That means a very minute amount of mismatch in the inside exhaust path but it seems insignificant.

    I think for the major bends, you should keep the cut wedges lined up and oriented as best as possible, otherwise you get a very wiggly exhaust line that looks kinda shitty.

    For example, parts of this exhaust look wonky to me.
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    Between the major bends and maybe one wedge inbetween, rotating the wedge to fit the path was a neccesary compromise for my first attempt...
    Last edited by jcw; 02-16-2017 at 05:50 PM.
    CaTacL1sm likes this.

  3. #43
    jcw
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  5. #44
    Senior Member CaTacL1sm's Avatar
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    The discouraging thing is that it doesn't look like they touch those welds with a grinder.

    practice makes perfect... or a machine does
    jcw likes this.
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

  6. #45
    jcw
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    I don't plan on touching mine with a grinder either.

    Either I get better or it is what it is.

  7. #46
    Senior Member nic579's Avatar
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    Quote Originally Posted by CaTacL1sm View Post
    The discouraging thing is that it doesn't look like they touch those welds with a grinder.

    practice makes perfect... or a machine does
    Tig weld, tight fit, no filler, weld positioner.

    Cold welds also sit on the surface, you might need more heat or slower travel speed. Usually novice is too cold but you haz will tell you that.
    Last edited by nic579; 02-17-2017 at 12:05 AM.

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  9. #48
    jcw
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    Good place. Made a collector from their kit.
    It was OK...





    An even cheaper place to get mandrel bends and collectors is SPD. I think they are one of the suppliers for Cone Engineering.


    Like I've said before, the problem with mandrel bends is that you are limited to one or two centerline radius only. In my exhaust, the 1 3/8" only came in 2.5" CLR. The stock exhaust had a much larger 3.5" CLR.
    With the pie cuts you can also alter the radius within a single bend if you want. Once you get the technique down, it's a very flexible way to make an exhaust. But it's not for most, obviously.
    Last edited by jcw; 02-17-2017 at 11:37 AM.

  10. #49
    jcw
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    First one back to the collector. Two to go. Then the mid pipe.

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    Yes, I am fond of zip ties...
    Last edited by jcw; 02-18-2017 at 03:51 PM.

  11. #50
    Senior Member CaTacL1sm's Avatar
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    looks really good.

    I like the braced swingarm.

    you should invest in black zip-ties. They are specifically for badass motorcycles.
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

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