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Exhaust pipe

Discussion in 'Post Yacht' started by Rich M., Apr 24, 2019.

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  1. Rich M.

    Rich M. New Member

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    Sep 17, 2015
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    Long Island NY
    Does anyone know who made the aluminum pipe between turbo and muffler. My boat is a 88 46 with 550 hp 692s thanks
  2. chesapeake46

    chesapeake46 Senior Member

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    I do not know who made them.
    I have 71's that also had aluminum pipes.
    I began to see little piles of aluminum dust beneath the pipes.
    I replaced them with stainless steel from DeAngelo Marine Exhaust.
    I also replaced the cast iron mixing elbows at that time, again with stainless from DeAngelo.
    I shipped them the old mixing elbows and exhaust tube.
    They made me replacements.
    The cost for two engines was around $ 2,400.00 in 2014.
    The were done on time and shipped on time and fit as promised.
    I would use them again.

    I replaced my turbos at the same time.

    I have a friend that replaced his aluminum tubes with fiberglass exhaust tubes.
    He made the offsets himself and they seemed to work out very well for him.
  3. Davidoc

    Davidoc Senior Member

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    I did the same thing using Metcalf, Fort Lauderdale. They also provided me with excellent turnaround time and great product. I chose fiberglass for the pipe that was reinforced where the hoses connect. I painted it with awlgrip. My engines are 692 and I don't remember the cost. I could look it up if you need to know.
  4. mwwhit1

    mwwhit1 Senior Member

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    I also shipped my old ones to DeAngelo and they made exact replacements. I doubt whoever made them originally has the template to make them now, site unseen.
  5. Rich M.

    Rich M. New Member

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    Thanks I called DeAngelo going send them old one and make new ones out of lnconel
  6. RT46

    RT46 Senior Member

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    DeAngelo is an excellent choice.

    On Long Island Marine Manifolds in Farmingdale.

    They made me one last year out of Cupronickel for $300 with a one day turn around.

    The hardest part was removing it and the "might as well" replacement of the hump hose and 8" hose from the elbow to the muffler. the blue hose is not cheap.

    Also, locally sourcing 8" blue hose was not an option. I ended up having a 3' lengt5h and the hump hose shipped from Fisheries Supply out west.

    Im going to say the whole job in materials was close to $1000 including the elbow, hose and replacing all the clamps.

    Also when the elbow and hump hose off you should inspect your shower head.
    Last edited: Apr 27, 2019
  7. chesapeake46

    chesapeake46 Senior Member

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    You are right about the blue hose being obscenely expensive but it was so easy to work with that I felt better about it !!!!!
    The old black exhaust hose on mine was over 20 years old and in pretty decent condition but I was not up for the fight !!
    Plus, it would have been dumb of me not to replace it all at once.
  8. Rich M.

    Rich M. New Member

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    I spoke to Paul at marine manifold he said he would make them for 800.00 per pipe maybe I misunderstood him I will have to call him back
  9. RT46

    RT46 Senior Member

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    yea call them back and check the quote. Im pretty sure it was 3oo.

    Let us know, I was planning on doing the other side this year because it cant be far behind the one that failed.

    The OEM one was stamped "Post 46" "port". I believe that Post had an in house welder fabricate them.
  10. RT46

    RT46 Senior Member

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    yes my black hose was also in excellent shape considering its age.
    I think it was at least 5 ply.
    The black hose was very difficult to work with and blue house was a breeze on the install.
    I will stick with the blue high heat silicone stuff in the future.
  11. Rich M.

    Rich M. New Member

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    I called Marine manifolds in Farmingdale he is more money it's better material and I'll also have it by next week so I'm going to go with him. I don't know what size pipes you have but mine are 8 inch and it's a lot more than $300 per piece
  12. RT46

    RT46 Senior Member

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    Im glad you hooked up with them. I have had very good experiences with them and quick turn around.
    The tig welds on the elbow they did for me are beautiful.

    I have 8" pipes that they fabricated out of Copper Nickel, I may be off on the cost. but their work and turn around was top notch and worth it.

    good luck!
  13. Jorge Lang

    Jorge Lang Senior Member

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    In my opinion the blue silicon hose is worth the extra money. As mentioned, it is much easier to work with as it flexes better than the more rigid black hose. Also the continuous temperature rating is at 350 degrees and it isolates vibration better because of its flexibility. Be aware that if you are switching from black to blue hose, you will need to purchase the t-bolt clamps for the blue silicon hose. As the wall thickness is less, the older clamps may not tighten down. Also remember to double clamp with the tightening screws offset by 90 degrees.
  14. Ormond Bert54

    Ormond Bert54 Senior Member

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    Metcalf has got my 12V71TI exhaust. - They are reworking it so there is more area cooled by the seawater. This will do away with most of the old nasty exhaust blankets to be replaced with advanced fiber components of some sort and max 140 degree temps.
  15. Jorge Lang

    Jorge Lang Senior Member

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    If you are extending the double jacketed area, I would recommend that you go with Inconel as opposed to 316L. Mostly everyone is now going with the hardcoat insulation. If you do have blankets for the flanged area, make sure it does not cover the hardcoat as this will lead to delamination. PM me if you have any questions about this.