thru hull exhaust

Discussion in 'Powerboats' started by Ridethe93gt, Jan 22, 2007.

  1. Ridethe93gt
    Joined: Jan 2007
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    Location: Lexington, SC

    Ridethe93gt JJ

    im wanting to put a thru hull exhaust on my 1973 IMP Aztec (it has a 302 w/ a 888 mercruiser foot)...i dont want anything fancy like all ss or stuff like that.....just something that sounds nice and just ss tips....where is the best place to order something like this from....im having a hard time finding this...any help would be greatly appreciated....

    JJ
     
  2. u4ea32
    Joined: Nov 2005
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    u4ea32 Senior Member

    Buy a hotboat or powerboat or Extreme or similar magazine. Lots of sites including rex marine, teague marine, dana products, cp products, ...
     
  3. stonebreaker
    Joined: May 2006
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    stonebreaker Senior Member

  4. julius750
    Joined: Feb 2006
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    Location: Melbourne Australia

    julius750 Junior Member

    stainless headers for Ford 302

    I can supply one piece stainless headers for you, direct fit. Regards, Julius
     
  5. charmc
    Joined: Jan 2007
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    Location: FL, USA

    charmc Senior Member

    Here
    http://www.westmarine.com/webapp/wc...goryg/10001/-1/10001/69/68/6/man/asc/ALL/grid

    and here
    http://www.westmarine.com/webapp/wc...h hull exhaust/All_2/mode matchallpartial/0/0

    I have no connection with them, just know they have good prices and selection of "standard" level parts and equipment. You said nothing fancy, so this would be a source for that. I think they offer no cost ground shipping, or you can go to a retail store; they are all over. Boat US sold all their stores to West a few years ago.
     
  6. tuantom
    Joined: Jan 2005
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    Location: Chicago

    tuantom Senior Member

    This was done on my boat.

    I have to say, it's way too loud unless you put some sort of muffler system in it. Nothing sounds better after an hour or two of running than killing the engine.
    I have a 351w and a volvo drive; but mercruiser log style manifolds with the p-trap riser on the back - probably what you have. One fine day (circa 1977) the cast aluminium exhaust bellows flange cracked and wouldn't seal anymore - The solution was to plug up the original system and go though the transom with the trumpet ports.

    Now the trouble is this: there is no room to do anything but put a 90 degree elbow tight to the bottom of the riser and into the trumpet if you want your exhaust to exit above the water line (which you probably want). On my setup it was really the only option without overly involved modification to the other accessories on the transom.

    Since I just put a new transom and stringers in this boat last fall (speaking of overly involved modification), I'm changing a few things around such as battery location, route of steering cable etc.. , for the sole purpose of making enough room to change the location of the exhaust ports. I need them to be sufficiently far from the riser so I can fit some kind of a muffler in the line.

    I really prefer the sound of thru-hull exhausts and am going that route again even though my new (to me) volvo drive setup is perfectly willing to accept the exhaust. Believe me - it has to be muffled in some way. All the yelling over the noise starts to wear on you after a while. Just my $.02.
     
  7. julius750
    Joined: Feb 2006
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    Location: Melbourne Australia

    julius750 Junior Member

    mufflers

    we can help with stainless one piece hig performance manifolds with the correct riser angle and stainless mufflers as well. Not cheap but durable, quiet and lightweight.
     
  8. tuantom
    Joined: Jan 2005
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    Location: Chicago

    tuantom Senior Member

    By the way..

    You need the marine exhaust hose - there's really no way around that; but for elbows and tees and such, you can go to a plumbing supply store for cast iron no-hub fittings.
     
  9. tuantom
    Joined: Jan 2005
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    Location: Chicago

    tuantom Senior Member

    Has anyone ever..

    Used round stainless steel automotive mufflers? I see that they make them up to 4" in diameter for the inlet/outlet.
     

  10. Bill55AZ
    Joined: Aug 2006
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    Location: Peoria, AZ

    Bill55AZ Junior Member

    I have an IMP that I am parting out, and it has the chevy engine with thru hull exhausts. Yours is a ford engine, tho, right?
     
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