Thru-Transom Hole Location
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Thru-Transom Hole Location

  1. #1
    Eliminated badluck24/7's Avatar
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    Default Thru-Transom Hole Location

    I'm switching to thru transom exhaust in my 18 bubbledeck and to be honest Im not sure where to place the holes in the transom. I'm open to any tips or advice on this subject.
    WOOP!

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  3. #2
    About 500' AGL MudPumper's Avatar
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    You should totally make them side exit.

  4. #3
    History Repeating Storz's Avatar
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    It seems like inline with where the header lines up would be the best option...I am switching over this winter from OT headers to thru-transoms as well, however mine has the cutouts from the stock exhaust already.
    '84 Laser LTV - Restoration in progress
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    Senior Member Schiada 201's Avatar
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    Thats where I have mine.

  7. #5
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    Default Thru transom

    Install the exhaust system. Take the exhaust hose you are going to use and install it on the header until it make's contact with the transom.Take a grease pencil and scribe a line around the hose. Remove the hose and find center and drill a 1/4 hole, go to the outside of the boat and go to the other side and measure from the molding down and from the transom adapter out. Drill your other 1/4 hole and you are now ready to drill your exhaust tip holes. This will make it look symetrical on the back of the boat but tou might have a little bending of the exhaust hose on the inside but you'll look good going down the road.

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    Seems silly i know BUT if you ran them out the bottom near the transom, would you get extra lift? it would be quieter too.

  9. #7
    Senior Member Schiada 201's Avatar
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    Form past experience at the bottom , lose hose and you sink, QUICK lower part of the transom flex's under power and inevitable loose the clams and pulls

  10. #8
    tintingsandiego krusn56's Avatar
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    They still have some of these left....
    http://www.performanceboats.com//showthread.php?t=56911
    Heres a pic of mine.

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  11. #9
    Member hollbrow's Avatar
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    When I was rigging my old beater hull that I bought with no engine or hardware I was having to buy all the exhaust parts anyway I was considering trying to run my exhaust from my thru transom bassetts out under the bottom of the boat to quieten it- I was about to start drilling/cutting and decided to "talk to some more folks first". I talked to a few builders that had tried it or "heard of it tried before" and thay said it would seriously lift and destabilize the back of the boat. I think that something could be done like making a channel for the exhaust or a step design or something. Be neat if you could figure a way to aereate the bottom with the exhaust and gain some speed like when you run on a slight chop it is supposed to be faster than glassy water.

  12. #10
    Eliminated badluck24/7's Avatar
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    Thanks Greg, that's just the reassurance I needed. Now, let's see how bad I can screw this up
    WOOP!

  13. #11
    Senior Member DuaneHTP's Avatar
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    Putting exhaust under the boat will vibrate so bad at idle, it will shake the needles off of your gauges. We've tried it! Always try to install your ports to where at least part of the port is out of the water at idle if possible. This stops a lot of vibration and exhaust splash on the back of the boat.
    Duane HTP

  14. #12
    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by MudPumper View Post
    You should totally make them side exit.
    Now there's an idea

    Quote Originally Posted by DuaneHTP View Post
    Putting exhaust under the boat will vibrate so bad at idle, it will shake the needles off of your gauges. We've tried it! Always try to install your ports to where at least part of the port is out of the water at idle if possible. This stops a lot of vibration and exhaust splash on the back of the boat.
    Duane HTP
    If you know here the boat sits in the water that is a very good idea. You get a little spray, sometimes allot but it allows the engine to breath at idle speed.

    The under the boat exit deal doesn't even look good on paper to me

    S CP

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  15. #13
    "Try it Now!" Tahiti Boss21's Avatar
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    Don't Ski Natique type boats run the exhaust totally under water?
    1992 Eliminator Daytona 21'

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    Quote Originally Posted by Tahiti Boss21 View Post
    Don't Ski Natique type boats run the exhaust totally under water?
    yeah, but they are only running half the cubic inches!!

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