ok w/o rubber flappers in TT exhaust
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ok w/o rubber flappers in TT exhaust

  1. #1
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    Default ok w/o rubber flappers in TT exhaust

    is it cool to run through transom exhaust (exits underwater) without the rubber flappers?
    they keep breaking off...
    i've heard different opinions.

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  3. #2
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    Quote Originally Posted by southwind74 View Post
    is it cool to run through transom exhaust (exits underwater) without the rubber flappers?
    they keep breaking off...
    i've heard different opinions.
    Ok as long as you are running the snails on your logs, the upside down p-trap looking things. I have personally ran without them on a fairly big cammed boat with absolutely no issues. Your going to waste your money replacing them only to keep losing them in the lake on anything but a completely stock engine. I had a boat with a stock Olds 455 and never lost the flappers.

  4. #3
    tintingsandiego krusn56's Avatar
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    I have the internal butterfly and they have burnt out on me leaving half the flap inside each tip...I am on my second season running this way and park my boat with current or parallel to passer by's. I have logs/snails...
    Made In The Shade

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    Senior Member TTspectra20's Avatar
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    If you guys are talking about the 3" ID ones that have a small metal half circle and 2 screws that clamp them inside the tip at the top.
    The po of my boat had 100 of them made and my boat came with about 80+ left. If anyone wants to come pick some up or pay shipping ill give a couple sets to each person that needs them.

    Sent from my Droid Razr Maxx using Tapatalk2

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    Senior Member wpmxwb's Avatar
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    There is diffent quality flappers out there. When I had logs I was running 15yr old flappers on far from a stock motor. Had a friend replace his they lasted 2 trips. Went with a different brand and he is still running the same ones 3 yrs later

  8. #6
    tintingsandiego krusn56's Avatar
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    Mine are imco internal butterfly made for 3 1/2 SS tips
    3 1/2" Flapper Valves (Internal) (Pair)
    Made In The Shade

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    i think they're like 2 5/8 ID or so.
    It is a stock motor, I've replaced both once or twice in three seasons.
    yesterday i just flipped the one upside down and reinstalled it with the missing chunk on the bottom.
    they always break clean off at the metal tab where the mounting screws are.
    it think i'll look for thicker rubber and make new ones.
    i worry about reversion, and its a simple fix...
    oh and yes i do have the snails.


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  10. #8
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    Quote Originally Posted by southwind74 View Post
    i think they're like 2 5/8 ID or so.
    It is a stock motor, I've replaced both once or twice in three seasons.
    yesterday i just flipped the one upside down and reinstalled it with the missing chunk on the bottom.
    they always break clean off at the metal tab where the mounting screws are.
    it think i'll look for thicker rubber and make new ones.
    i worry about reversion, and its a simple fix...
    oh and yes i do have the snails.


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    The flaps arent really there for reversion, they are there simply to keep wakes and waves from going up into the exaust when you are slowing down or sitting still. You would have to run a pretty big cam to have reversion problems with logs and it would be too big to be efieient with logs any way. I think I was told on this sight a few years ago that you dont want to go over 240 @ .050 exhaust duration with logs because you will gain nothing by doing so.I ran a 560 hp bbc with logs (not dynoed with the logs) with no flaps and no issues on a very rough lake. It is kinda neet hearing the flaps rattle though

  11. #9
    Junior Member cncsparky's Avatar
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    I kept breaking my flappers on trumpet exhausts, thought it was cheapo rubber until I read a forum thread from someone that the screws may not be tightening down far enough to hold the flapper tight. I added some washers behind the screw head, but some have tapped the hole deeper. After breaking flappers every trip, I've now gone six days on the lake without breaking one
    - Tom

    84 Taylor BR 496/Berk JF

  12. #10
    Hoodys and swim trunks Elkidminoltu's Avatar
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    I have edlebrock logs n' snails and 3" trumpets w/o flappers on a stock 350sbc. Haven't had any problems in 2 years and even shut the boat down accidentally one time coming to a stop and a big wave crashed into the transom. If I anchor, I do so bow out. Just remember to stay ahead of that big wake on decel and keep the motor running until you come off plane.

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    the answer is...
    drum roll...

    NO!

    hydro locked the motor first time out!

    its not worth it to me for a $10 fix

    i had put the broken one back on just to run that day figuring it was better than none.

    i sat for a second in a cove to make a call, then turn the key and locked.
    pulled the plugs ran the water out and then ran the boat.
    ran fine afterwords

    i think now i'll just keep an extra pair in the boat and check them often for cracks and replace BEFORE they break.

  14. #12
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by southwind74 View Post
    the answer is...
    drum roll...

    NO!

    hydro locked the motor first time out!

    its not worth it to me for a $10 fix

    i had put the broken one back on just to run that day figuring it was better than none.

    i sat for a second in a cove to make a call, then turn the key and locked.
    pulled the plugs ran the water out and then ran the boat.
    ran fine afterwords

    i think now i'll just keep an extra pair in the boat and check them often for cracks and replace BEFORE they break.
    Good that you caught this and didn't suffer worse damage, The flappers are there and are used for several reasons not the least of which is to control the "Jet slow down wave", water backwash, occasional "diesling" (run on) and potential "reversion issues " , unfortunatley like lots of things sold /manufactured in todays world flappers can come from overseas where there quality is "lesser" and thus they don't last well Tom

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    ok so they're 3 5/8 inch.
    i got some from a cool local shop but had to cut them down from 4 inches
    they're from glenwood i think.
    anybody know where to get some 3 5/8 inch rubbers

  16. #14
    Senior Member NiceGuyEddie's Avatar
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    Quote Originally Posted by southwind74 View Post
    the answer is...
    drum roll...

    NO!

    hydro locked the motor first time out!

    its not worth it to me for a $10 fix

    i had put the broken one back on just to run that day figuring it was better than none.

    i sat for a second in a cove to make a call, then turn the key and locked.
    pulled the plugs ran the water out and then ran the boat.
    ran fine afterwords

    i think now i'll just keep an extra pair in the boat and check them often for cracks and replace BEFORE they break.
    x2
    My buddy's bro in law just hydro locked his dad's boat at the sandbar because he removed them to make it sound more cool.

    Even the IMCO internals blow out. Mine did. They are kind of a PITA to replace. I just put a set of external flappers on.
    Last edited by NiceGuyEddie; 07-15-2012 at 04:33 PM.

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