Exhaust flappers
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Exhaust flappers

  1. #1
    Member tinbender71's Avatar
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    Default Exhaust flappers

    Is it really necessary to have flappers on the exhaust on my boat? Seems like I have seen a few without them. BTW the boat is a 16' Tahiti. Just curious.

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    Senior Member 2savage4you's Avatar
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    Quote Originally Posted by tinbender71 View Post
    Is it really necessary to have flappers on the exhaust on my boat? Seems like I have seen a few without them. BTW the boat is a 16' Tahiti. Just curious.


    In short........


    YES

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    Senior Member milkmoney's Avatar
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    Quote Originally Posted by tinbender71 View Post
    Is it really necessary to have flappers on the exhaust on my boat? Seems like I have seen a few without them. BTW the boat is a 16' Tahiti. Just curious.
    in long..............

    hell yes

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    Member tinbender71's Avatar
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    Thats kinda what I thought. Thanks!

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    The rubber flappers slow down the water coming in so that the risers/snails actually work in keeping water out of the engine.

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by tinbender71 View Post
    Is it really necessary to have flappers on the exhaust on my boat? Seems like I have seen a few without them. BTW the boat is a 16' Tahiti. Just curious.
    If you have a straight shot from the transom nozzles to the manifolds, like I have seen on a few boats, hell yes you do. You need to pray too, and never anchor stern to the waves.

    If you have snails/risers on the manifolds, I still think it's a good idea.

    If you have a set of headers like mine that don't arch over untill they are next to the carburetor, that's awfull high and I don't think so.
    I still like peace of mind.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

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    The rest of us are being dragged along kicking and screaming.

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    Member Flash's Avatar
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    Please use them, if you blow out an exhaust hose you'll have a 3" to 4" drain hole in your boat. At least with the flapper it will give you time to get to shore or get people out of the boat before it fills up with water.

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    Senior Member CK7684's Avatar
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    If you keep blowing out the cheap rubber flappers, here's what I did...I went to a shoe repair place and got some thicker rubber. They lasted me for years. When I redid my boat and put in new exhaust tips, I blew the new rubber right out and ended up pulling my old shoe rubber flappers out and they have lasted just fine this summer as well...wish I could be more specific on the type of rubber, but I used to work across the street from the shoe place and he just gave me a few pieces. It's worked great!! Also deburr and take the sharp edge off the little metal holding tab. That should help...

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    As everyone else has said most definately. I rebuilt my motor because a rat or something got into the exhaust and ate little bitty pieces out of the corner of the rubber flapper. This let the flapper go past the stop and let cold water in hit and fracture a valve. New top end, port heads, new cam, intake manifold, & carb.

    Being a little slower than most I didn't discover the bad flapper until the following season when it happened again. New top end again, new pistons, new rods, more compression, more cam.

    The good news is that each time it happened I was able to build the motor a little bigger and stonger. Also the second time I included a new exhaust with new tips with metal flappers, and external rubber flappers.

    Water in the exhaust is not your friend. It is good to ask the question rather than learn the hard way like I did.

  12. #10
    Senior Member CK7684's Avatar
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    Oh, hmmmm...we are talking thru transom exhaust I presume?

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    Member tinbender71's Avatar
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    Thanks for all of the replies, yes it is thru transom and it does have snails. I just rebuilt the engine, and while breaking the cam in while on the trailer, I blew one off. I had a new set just in case. Tom at Jet Boat Performance had sent a pic of a Tahiti like mine and it did not have flappers, and was just curious. Thanks for the help.

  14. #12
    Senior Member CK7684's Avatar
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    Yea, I blew both mine off within a few seconds of firing mine up for break in also...the shoe rubber I used is twice as thick...

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