transom exhaust flappers
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transom exhaust flappers

  1. #1
    Senior Member rpm0414's Avatar
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    Default transom exhaust flappers

    Was getting my thru transom exhaust tips chromed and was wondering if the rubber flapper is really needed?? Is it somehow blocking water on reversion or anything when slowing down from plane?

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    21 Daytona Outlaw's Avatar
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    Yes depending on the set up
    They actually help prevent water surging from getting to your engine

    Last year I lost one and hydro locked
    My engine
    Had to pull the plugs and crank it to purge the engine while on the water

    After loading up I discovered I had lost one flapper now it's part of the pre and post inspection


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    Depends on the total system/set up

    Have never run them in the boat and never had an issue.

    S CP

    "Dark Sarcasm"
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    fast is the other half.
    " A Government big enough to give you everything you want is big enough to take away everything you have"

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  6. #4
    Senior Member rpm0414's Avatar
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    This is pic of one. I don't mind putting them back in just look cooler without. Lol
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    Quote Originally Posted by rpm0414 View Post
    This is pic of one. I don't mind putting them back in just look cooler without. Lol
    Put them back in for peace of mind.
    Last edited by Ol Blue; 04-19-2012 at 11:49 PM.

  8. #6
    Senior Member rpm0414's Avatar
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    Ya I'm thinking so too. Better safe than sorry

  9. #7
    21 Daytona Outlaw's Avatar
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    If you still have log exhaust definitely put them back on




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    Senior Member 1975sleekcraft's Avatar
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    so heres the deal...
    you never need them when under power...the problem occurs when your floating or beached...waves that run into your transom at the right angle will flow up and over your snails...

    put'em in !!

  11. #9
    tintingsandiego krusn56's Avatar
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    Mine kept blowing out so I decided to go with just the the half piece still inside. I park going with water current. No water issues and have log exhaust. The pic you showed has two types of flappers...inside and out.
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  12. #10
    Jet boat service
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    The best flappers to use for those outlets are the Salsbury style flaps that clamp over the outside of the exhaust bell. You may not like the look but they don't break. I used them for years. Jim

  13. #11
    Senior Member 1975sleekcraft's Avatar
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    i used the sidewall of a tire. worked awesome!! still looked like they did when i put them in...5 years later !!!

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    Senior Member 1975sleekcraft's Avatar
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    here they are in action a few years back...

    vehicles039.mp4 video by ddaazz - Photobucket
    Last edited by 1975sleekcraft; 04-20-2012 at 09:31 AM.

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    RPM

    I have inside stainless flappers with outside rubber flappers. The reason is my gas station recieved a load of bad and or mislabeled gas and my motor detonated (ran on) when shut down. It hydrauliced and broke a lifter and fractured some valves. I assumed that it was because of the detonation. I fixed the motor did some upgrades and the motor ran much better.

    Next year my daughter took the boat out and said it sounded funny after she let off the gas while heading to the launch ramp. Water fractured the valves again, but this time #1 cyl valve broke off and was sucked into #7 and pushed through the piston.

    When I got the boat home a friend of mine noticed that a corner of the rubber flapper was missing and pushed inside from water hitting the back of the boat during shut down.

    I had Marine Power exhaust with rubber flappers, and a rat evidently liked the flavor. It looked like little tiny teeth marks next to the corner that was missing. You may never have this problem and after more money than I care to remember spending, I hopefully never will either.

    Good Luck

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    Quote Originally Posted by rpm0414 View Post
    This is pic of one. I don't mind putting them back in just look cooler without. Lol

    Headers or logs with risers?

    S CP

    "Dark Sarcasm"
    Going fast is only half the fun ... what you make go
    fast is the other half.
    " A Government big enough to give you everything you want is big enough to take away everything you have"

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