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  1. #1
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    Sep 2011
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    286

    thru hull exhuast how much angle needed

    ok gonna try and set the 454,s in my formula this weekend to mock up the engine compartment i have older center dump exhuast . Im going to run flex hose back to transom to the tips i have to cut holes for.. how much of a down hill angle do i need ? or how flat can the hose be any rule of thumb on this...

  2. #2
    VIP Member VIP Member MILD THUNDER's Avatar
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    38 Fountain
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    Jul 2004
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    chicago
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    6,472
    Merc actually had a drawing for this. The nice thing about following that, is if you decide later to go aftermarket, you can use off the shelf tailpipes.

  3. #3
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    My Boats:
    1989 Formula 272 SR-1 1979 Formula 255 Liberator...My 4th Formula
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    Jan 2011
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    West Palm Beach, Fl
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    2,658
    Quote Originally Posted by jason y View Post
    ok gonna try and set the 454,s in my formula this weekend to mock up the engine compartment i have older center dump exhuast . Im going to run flex hose back to transom to the tips i have to cut holes for.. how much of a down hill angle do i need ? or how flat can the hose be any rule of thumb on this...
    I did a trial on mine with the small blocks and figure real quick that I had to have tall risers to get over the top of the steering...very tight fit. If I go low I am beneath the swim platform and underwater at rest. Right now I'm leaning towards the Y-Pipes.

  4. #4
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    34 Hatteras 00 Crownline 248 ccr
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    Feb 2012
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    1,815
    if the angle is a little off between exh hose and tips the way they are mounted in transom, a guy on here had a good idea for a small angle elbow. take a piece of 4 inch stainless tubing, and cut it about 6 inches long with the cuts at a slight angle. then you can tilt the hose on the tubing for a 10 or 20 degree angle.

  5. #5
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    77 donzi x18 92 formula 336 sr1
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    Aug 2005
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    Between A Womans Leggs in IL
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    5,986




    first one is bbc with a bravo one,second is sb or bb alpha one..funny thing is they both have the same measurements..most formulas have a higher (6'') spacer then the riser so the exhaust will fit into the silent thunder platform..if you dont have a silent thunder~~~~~~~~~~~~~~~~~~~~~~~

    wait a min is this the 255 liberator???? your going to be close with the big blocks in their....

  6. #6
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    Sep 2011
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    286
    yes 255 liberator with big blocks..


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