new exhaust I put together for my bike today

Discussion in 'Motorized Bicycle General Discussion' started by mapbike, Mar 15, 2011.

  1. mapbike

    mapbike Active Member

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    This isnt finished yet it neds paint.

    I used a mufflrer like is on the 8-10hp older briggs engine and did just one internal mod. to it, I drilled a 3/8" hole through the diverter plate in the center of the muffler so it would flow a tad better but still not be to loud and it worked out great, still sounds good but is at a comfortable sound level ripping down the road, I also cut the threaded end off so the tubing would slide inside the muffler just a bit.

    I had to do some bending on that tubing to get it positioned right but I like the way it turned out.

    Just thought I would share todays project with all you guys.

    Let me know what you think about it
     

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  2. 2door

    2door Moderator
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    Map,
    That has to be a quiet system. What is the tail pipe made of?
    Tom
     
  3. flybytaco

    flybytaco Metal Molding Madman

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    sweet does it run good?
     
  4. mapbike

    mapbike Active Member

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    Tom, (2door)

    I made it from 3/4" electrical conduit and used a Klein Tools conduit bender to shape it, yes it is much quiter than anything else I've had on either of my bikes, but it still has a nice sound, it isnt choking the engine down at all, it is still very responsive and still pulls good also.

    flybytaco,

    I have a pretty dang steep hill about 1/2 mile down the road outside our gate and its a fairly long uphill climb, before with the super loud mainly wide open pipe it would loose about 4-5 MPH by the time I got to the top of the hilland now with this pipe I loose around 6-7 MPH thats starting up the hill doing about 30 MPH and going around 23- 24 MPH at the top now, so I did loose a slight bit oh speed on the hills but not much and it sounds so much better it is worth it on the hills.

    I didn't loose any top end speed though on flat ground or a slight incline, it will still hit 36MPH with my 36T sprocket so.

    I like it so well I'm gonna make one for my other bike and also for the one I have in the process........it really works great.........not hard to build with just a few tools, I did braze the muffler on and the mounting tab, but mainly just a tubing bender, a 4.5" hand grinder with a 1/16th cut off Disc, an electric drill, and my acetylene torch I used to do the brazing and a pencil for making maks on the tubing so I would know where I needed my bends to be. very simple project if a fella has the tools and well worth the effort IMO.

    Iyou can build you one and see what I mean about how good it sounds and how well it woks, just be sure to drill that 3/8" hole in the center of that diverter plate that is in the muffler, it may not flow good enough if you donet, it wll be quiter but may to to much power away.......just a hint/thought on that part of it.
     

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