custom exhaust

Discussion in 'Motorized Bicycle General Discussion' started by pwrobleski, Nov 5, 2009.

  1. pwrobleski

    pwrobleski New Member

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    I'm want to make a custom exhaust that utilizes the original muffler and flange. What type of metal tube or pipe should I use for the piping? I gonna take it by a muffler shop and have them custom bend it to where I want to route it. Then I'm gonna take it to a place and have it powder coated. So whats the best material and thickness of the sidewall for my application?

    .flg.
     
  2. BarelyAWake

    BarelyAWake New Member

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    Um... might be better off at an "Industrial Metal Supply" or a general welding shop - even plumbing perhaps. I doubt yer average exhaust shop has the tooling for bending such a small diameter. I'm pretty sure powder coating won't last on such a high heat application either.

    All is not lost however - the gauge yer talkin about is pretty easy to bend, just gotta pack it with sand and cap both ends (welded) and you should be able to bend it yourself. The sand is to keep it from kinking - and the exaust shop would have the same problem, with the larger pipe it caves in the side a bit even with their benders - they just don't care with that "large" a pipe.

    And ofc any high-temp rattlecan paint will look sweet :)


    Yet - have you checked out this: Sick Bike Parts tuned exhaust? Not only will it give ya the length yer after - you get a pronounced power boost as well...

    Just a thought ;)
     

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  3. pwrobleski

    pwrobleski New Member

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    Do you think in even kink with a mandrel bender? And what typed of piping would you suggest? And gauge? Would reg steel conduint work, black iron pipe, stainless, not sure which one i want to use. I use to make custom conviers so I have knowledge for material. Just not much for making a exhaust, lol



    .flg.
     
  4. silverbear

    silverbear The Boy Who Never Grew Up

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    Can't remember who, but someone here used a bicycle handlebar for exhaust tube.
    SB
     
  5. pwrobleski

    pwrobleski New Member

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    With the exhaust from sbp, whats the use for the 2 springs- do you know? lol
     
  6. pwrobleski

    pwrobleski New Member

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    hey thanks for that idea, good one
     
    #6 pwrobleski, Nov 5, 2009
    Last edited: Nov 5, 2009
  7. BarelyAWake

    BarelyAWake New Member

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    Most exhaust is mild steel stock, I'm sorry but I've no idea the wall thickness - me and numbers lol :p However - mild steel of that size is fairly simple to bend yourself. Any two points of contact and leverage will do it, best if you can find a round surface - but just about anything will do. People 'round here have used conduit with success - I've just not messed w/it myself.

    Lotsa lil bends to make a big or sharp bend, that's all there really is to it if you haven't a proper tubing bender. If yer going with stainless tho it's another matter - that stuff is rugged and somewhat brittle/prone to cracking from bending abuse. I personally think stainless is great - but maybe not worth it for the do-it-yerself... maybe not for this application either - I'd just make another if I needed to. It's all up to the builder tho ;)

    I'd still go with a tuned exhaust, even a custom job - over a regular pipe & can. It's just too much a response to overlook - the 2 stroke begs for 'em lol

    The two springs on the SBP's pipe are because it's a flexible joint. Common to see on other "small" 2 stroke vehicles like snowmobiles and ultralights, it helps reduce metal fatigue due to vibration and torque flex. It is usually a ball & socket joint, the SBP's one also gives more options for mounting orientation.

    There's a buncha sweet expansion chambers out there and a few different styles, I do favor the SBP one obviously :D
     
    #7 BarelyAWake, Nov 5, 2009
    Last edited: Nov 5, 2009
  8. pwrobleski

    pwrobleski New Member

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    Thanks for the info barelyawake, it helped me out alot

    .flg.
     
  9. 2door

    2door Moderator
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    1/2" and 3/4" EMT (steel electrical conduit) works great. Benders are cheap and once you get the knack of getting the bend where you want it you can do almost anything as far as an exhaust system goes. The bend radius is a little longer than I'd like but with some practice you can reduce the radius by moving the pipe in the bender as you go. There's no need for sand or heat. An added plus is if you use new conduit the galvanized coating will take a nice shine with a little work on the buffing wheel and some compound. Napa sells a silver high temp engine rattle can paint that will withstand the exhaust heat even right at the cylinder/flange.
    Here's a couple of pipes to give you an idea of what's possible.
    Tom
     

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  10. pwrobleski

    pwrobleski New Member

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    hey thanks 2Door, Do u ow if they carry that high temp paint in a flat or satin blk?


    .flg.
     
  11. 2door

    2door Moderator
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    pwrobleski,
    Can't say what colors/textures it comes in. Here's what the can looks like.
    Tom
     

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  12. bairdco

    bairdco a guy who makes cool bikes

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    barbeque paint is flat black.
     
  13. Elmo

    Elmo New Member

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    There is a thing called a hickey bender for conduit that can make a tighter radius bend. Also if you have a wood lathe you can make a wood wheel with a groove the same radius as your pipe and make the bend radius to suit. Lindsay's Technical Books has a book on making a bender like this. Cheap price too. Ihave seen headers on hot rods with a chrome type powder coat that worked well.
    Elmo
     
  14. Retmachinist

    Retmachinist New Member

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    Here is what I built with cut up handlebars.

    John
     

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  15. Reel Adventure

    Reel Adventure New Member

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    They sell it in flat black.

    I had a custom exhaust shop bend and weld mine for $30 bucks. All I had to do was paint it.
     
  16. cardenw

    cardenw New Member

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    I USED COPPER TUBING FROM ACE HARDWARE IT HAS WORKED JUST FINE ONLY THING I HAVE
    NOTICED IS THAT IT HAS BENT TENT JUST A LITTLE SO NOW ON SIDE HAS THE INDENT OF MY BIKE TUBE AND THE OTHER SIDE OF HAS THE INDENT OF WHERE MY PEDLE HIT IT BUT OTHER THAN THAT IT WORKS JUST FINE>.shft.
     

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