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  1. #1
    Silver Member
    Join Date
    Feb 2008
    Posts
    125

    Default Exhaust overhaul

    I have not posted in some time but I read this board almost daily. I get great info and ideas for all of you. Thanks!

    It's cold as heck down here in South Louisiana, some folks think **** is freezing over cause the Saints may finally go to the Super Bowl, so I am pulling my winter maintenance. I'm doing mostly routine stuff but one thing I am doing is overhauling the exhaust on my 422. I got really tired of the excess heat generated by the standard PT exhaust system and the noise so I'm trying a little custom stuff.

    What I landed on is a piece of 1 5/8" exhaust pipe, two 1" nipples, and two generic 1" screw on mufflers, the big round ones. What I am doing is cutting the PT square tubing just past the second cylinder and will sedge up the 1" to the 1 5/8". That runs out the same notch that is cut in the cover. Once outside the cover I built a manifold with the two nipples welded into it and the mufflers will attach there. I figure I am at least doubling the exhaust path by doing this. I also picked up some exhaust wrap and plan to wrap the whole exhaust manifold out to the mufflers.

    I should have pictures in a day or two and will post them. I'm hoping for a much cooler and quieter 422. Wish me luck!

  2. #2
    Silver Member
    Join Date
    Feb 2008
    Posts
    125

    Default Re: Exhaust overhaul

    OK, I did a bit more today. Here is what I have so far. With a bit more welding I'll be ready to try her out. So what do you think?
    Attached Thumbnails Attached Thumbnails -img00062-jpg   -img00063-jpg   -img00064-jpg  

  3. #3
    Elite Member
    Join Date
    Jul 2006
    Posts
    4,409
    Location
    Northwest, WA

    Default Re: Exhaust overhaul

    Looks good.

    That's alot of weight out on the end of that, you thought about some type of support ?
    ::Sent from a standard desktop keyboard::

    My Photobucket

  4. #4
    Platinum Member tmarks11's Avatar
    Join Date
    May 2005
    Posts
    656
    Location
    Port Orchard, WA
    Tractor
    2005 Power Trac 422

    Default Re: Exhaust overhaul

    It probably weighs quite a bit less then the OEM PT 1/4" steel box muffler he took off.
    -----------------------------------------------------
    Now in Port Orchard, WA
    2005 PT-422
    4n1 bucket, minihoe, auger, 48" mower, land pride aerator, tow adaptor, forklift, crane, Herd GT77 spreader, LMB, 60" blade, M1 abrams turret.
    PT422 (6/23/05) photo page

  5. #5
    Member
    Join Date
    Mar 2008
    Posts
    42
    Location
    Lakes Region, New Hampshire
    Tractor
    PT 425

    Default Re: Exhaust overhaul

    How did you make out, is it quieter than the OEM muffler? I would love to find something quieter.

  6. #6
    Veteran Member westcliffe01's Avatar
    Join Date
    May 2009
    Posts
    1,011
    Location
    SE MI
    Tractor
    Bobcat B200 TLB

    Default Re: Exhaust overhaul

    You need some volume, preferably something with some fiberglass inside to take the edge off. Take a drive to the exhaust shop and try a 3 way muffler, and if possible add an outlet pipe 2 feet long. If the muffler can be connected to the engine with flex hose, this allows the muffler to be hard mounted on the frame, perhaps with a vertical stack.

    Alternatively, look at places like smallenginewarehouse.com for mufflers off the Honda and Robin engines. They have better mufflers out the box.

  7. #7
    Silver Member
    Join Date
    Feb 2008
    Posts
    125

    Default Re: Exhaust overhaul

    Well I finally finished this up over the weekend and tried it out. It is a bit quieter but not as much as I had hoped. The tone is much better and I must say the engine runs better. It is easier to start, seems to run cooler and has no backfires! I'd say it was worth it.

  8. #8
    Veteran Member
    Join Date
    Mar 2007
    Posts
    1,171
    Location
    Bay Area, CA
    Tractor
    Power Trac PT1445

    Default Re: Exhaust overhaul

    Dear SwampmanLA,

    Many congratulations! It sounds really successful. Are you going to post photos?

    An engine that starts easier, runs cooler and doesn't have backfires sounds like a great reason to have done it.

    On a separate thread, I saw a home video of someone that had welded a cheap $20 automotive muffler on some flex hose to connect it to his generator with a slip fitting. It knocked 30-40dBa off the generator noise. I have a similar model that is loud at the 60' distance.

    All the best,

    Peter

    Quote Originally Posted by SwampmanLA View Post
    Well I finally finished this up over the weekend and tried it out. It is a bit quieter but not as much as I had hoped. The tone is much better and I must say the engine runs better. It is easier to start, seems to run cooler and has no backfires! I'd say it was worth it.

  9. #9
    Silver Member
    Join Date
    May 2009
    Posts
    157
    Location
    Kerrville TX
    Tractor
    PoiwerTrac 2445

    Default Re: Exhaust overhaul

    I had to build a muffler for a 6 wheel swamp buggy I had one time. We used pipe stuffed with metal shavings. I believe they were SUS. The over size & shavings dropped the pressure & the shavings cooled th gas flow a little. Worked pretty good. The engine was quieter than the drive chains. The shavings might last longer than fiberglass.
    Rgds,
    tim
    "It's only Me 'n I'm home from the Sea..."

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