18 cp tunnel ride
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18 cp tunnel ride

  1. #1
    SLOW MEMBER slowboy's Avatar
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    Default 18 cp tunnel ride

    I have been trying to tune my 18 cp tunnel. It seems that no matter what I do, the nose rides real low all the time. How does everybody set these up? How high should the nose be riding at speed? I am scared of having this boat hook while going fast.

    Any help is appreciated.
    WORK HARDER, MILLIONS ON WELFARE DEPEND ON YOU.

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    Senior Member bc18's Avatar
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    Quote Originally Posted by slowboy View Post
    I have been trying to tune my 18 cp tunnel. It seems that no matter what I do, the nose rides real low all the time. How does everybody set these up? How high should the nose be riding at speed? I am scared of having this boat hook while going fast.

    Any help is appreciated.
    Talk to jack at marine performance designs

  4. #3
    SLOW MEMBER slowboy's Avatar
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    Come on guys, there are a bunch of you with this same hull. How low is the front of this thing supposed to ride while in the throttle? Trimming the diverter up does not seem to raise the front at all.

    This is completely different than my last hull.
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    Senior Member River Dad's Avatar
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    With the limited experience I had in my old 18 tunnel (the one Russo is restoring) it seemed to run fairly flat. It didn't carry the nose anywhere near what a gullwing does. I think set up is extremely important on these hulls not only for performance but to keep you from getting wet. If I were you I would seek out a few board members that have these boats and get a good baseline to go from. I don't remember what we had in our deal back then but it might even be worth giving Scotten a call. Just my .02 RD

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    Senior Member HBInHeat's Avatar
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    Quote Originally Posted by slowboy:1655357
    Come on guys, there are a bunch of you with this same hull. How low is the front of this thing supposed to ride while in the throttle? Trimming the diverter up does not seem to raise the front at all.

    This is completely different than my last hull.
    Since this hull was designed for track use only and isnt river friendly I honestly dont.think there are but a few guys on here that run them.. Id also contact jack at mpd he works on two on a regular basis. I know his pod extensions would be a must if I had one to better ur chances if the nose takes a digger.

  8. #6
    Amber Racing Services BUSBY's Avatar
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    Here's how it should ride at speed:



    Last edited by BUSBY; 06-19-2012 at 11:12 AM.

  9. #7
    SLOW MEMBER slowboy's Avatar
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    That is exactly what I am looking for. I wish I had a current picture of my boat running. From what I am told by my friends, my boat is running much wetter than that. I think mainly in the center section. How high can you go with the ride plate before having a chance of blowing this over?

    Thanks for all the help, Ryan
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  10. #8
    Amber Racing Services BUSBY's Avatar
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    It all depends on your boat set up. These two pictured are race boats. You have to consider wieght and your center of gravity. It takes a lot of time to get your set up just right.

    Start off by measuring your ride plate angle in comparison to your hull right at the shoe. Adjust .060 up and see how it rides, then play with your diverter. Make adjustments accordingly. You'll find your sweet spot. Measure MPH via gps. there are apps you acn download onto your phone if you don't have one.

    Nevermind what it looks like when at speed ... care about the best performance while staying safe. Tunnels should ride flat, not nose high. Getting lift from your shoe/hull set up. Running the nose high will increase your chance of blowing over.

    Good luck

  11. #9
    SLOW MEMBER slowboy's Avatar
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    I had this 105 on gps last fall. There was a TON of speed left in this thing, actually it felt safer and more stable the faster I went. It just feels that the nose is quite low while running it at any MPH. Maybe it is an optical illusion to me as I am sitting on top of a tunnel causing my line of sight to be quite different than what I was used to before. I will get some photos and video of it running and compare it to the pictures posted above.
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    SLOW MEMBER slowboy's Avatar
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    Oh... by the way, it has a small block chevy in it.
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    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by slowboy View Post
    Oh... by the way, it has a small block chevy in it.
    ok now.................

    this thread is useless without pictures.


    S CP

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    fast is the other half.
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    Senior Member 2002CP19's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    ok now.................

    this thread is useless without pictures.


    S CP
    Can you photoshop a 632" FORD in there?

    Would be much more photogenic, just sayin'.
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    Hold it firmly on the ground, a few pelvic thrusts should do the trick. If not repeat till satisfied!

  15. #13
    SLOW MEMBER slowboy's Avatar
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    This is the best picture I have of it right now.



    Nothing special, just a small block.
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    Take pics of your hardware and email them to me [email protected]. I owned that boat when it was here in Cali. It ran very clean and with a single carb 482 Chevy ran 9:0 's and 115 mph.

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