16' Tunnel Setup?
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16' Tunnel Setup?

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    Senior Member Lildave's Avatar
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    Default 16' Tunnel Setup?

    Boat - 86 Mantra 16' Tunnel (305lbs hull) very similar to CP Tunnel and Texas Tunnel bottoms
    Engine - 440" BBC (nothing too special, guessing 550hp ish)
    Pump - 1994 American Turbine with a B impeller

    No droop. No diverter. Center blocker loader. No inducer. 3.125 nozzle. Currently has a 5 degree wedge.


    The boat runs really wet it seems. Before the 5 degree wedge, it was running in the water up to about the drivers seat. Now it runs in the water at about the back seat. It runs pretty strong up to 4200ish rpm's and hits kind of a flat spot for a second, and then pulls to 5400rpms and that's all she will do. I'm not sure what mph 5400 is with a B impeller, but I feel like it should turn a little more than that as small as the boat is. Am I wrong thinking that?

    How do I measure for all of the items in the pump setup? It's a radius keel, not a flat keel. Do I measure off the bottom of the radius? The side where it's flat? Where do I go from here?

    How far should the loader hang down?
    Should I put in an open loader?
    How far should the shoe hang down?
    No droop/Full droop/Mini droop?
    Diverter?
    Nozzle size?
    Ride plate angle?
    Wedge or no wedge?

    On this short of a boat, how dry or wet is it ideal to run?

    It did pick up quite a bit when we went from no wedge with the pump aiming 4 degrees down, to adding a 5 degree wedge in it....I'm slowly learning about these boats, but still very new to it all. Thanks for any help!

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  3. #2
    Senior Member Lildave's Avatar
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    So many views and no feedback?

  4. #3
    Impeachment! 75 TX's Avatar
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    Quote Originally Posted by Lildave View Post
    Boat - 86 Mantra 16' Tunnel (305lbs hull) very similar to CP Tunnel and Texas Tunnel bottoms
    Engine - 440" BBC (nothing too special, guessing 550hp ish)
    Pump - 1994 American Turbine with a B impeller

    No droop. No diverter. Center blocker loader. No inducer. 3.125 nozzle. Currently has a 5 degree wedge.


    The boat runs really wet it seems. Before the 5 degree wedge, it was running in the water up to about the drivers seat. Now it runs in the water at about the back seat. It runs pretty strong up to 4200ish rpm's and hits kind of a flat spot for a second, and then pulls to 5400rpms and that's all she will do. I'm not sure what mph 5400 is with a B impeller, but I feel like it should turn a little more than that as small as the boat is. Am I wrong thinking that?

    How do I measure for all of the items in the pump setup? It's a radius keel, not a flat keel. Do I measure off the bottom of the radius? The side where it's flat? Where do I go from here?

    How far should the loader hang down?
    Should I put in an open loader?
    How far should the shoe hang down?
    No droop/Full droop/Mini droop?
    Diverter?
    Nozzle size?
    Ride plate angle?
    Wedge or no wedge?

    On this short of a boat, how dry or wet is it ideal to run?

    It did pick up quite a bit when we went from no wedge with the pump aiming 4 degrees down, to adding a 5 degree wedge in it....I'm slowly learning about these boats, but still very new to it all. Thanks for any help!
    I'm no expert, but I have a few questions. What angle do you have your rideplate set at currently? What kinda shoe? Flat, tapered, backcut? Where is it in relation to the keel? Why no diverter? Seems the simplest way to adjust your ride attitude.
    And about your rpm's, I could be wrong but I believe rpm has everything to do with the amount of power you have to turn the impeller and nothing to do with the size of the boat.

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    Senior Member Lildave's Avatar
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    I believe the ride plate is 4 degrees up

    I don't know what flat, back cut, or tapered means?

    I thought at first the shoe was 3/4" below keel, but that was measuring from the flat surface beside the radius of the keel...then somebody told me you had to measure from the bottom of the radius of the keel. I'm not sure if that is true. That is one of my questions.

    I'm VERY new to all of this, but I do know that with the same HP and same boat if you get more of the boat out of the water and reduce drag, you'll go faster and turn more RPM's.

    Maybe my setup is right, and I need a bigger motor? I just don't know what is right and what is wrong.

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    Senior Member zacho!'s Avatar
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    I'm VERY new to all of this, but I do know that with the same HP and same boat if you get more of the boat out of the water and reduce drag, you'll go faster and turn more RPM's.

    I believe the engine will only spin as many RPMs as the impeller will allow.

  8. #6
    triple digit sightseer redcat's Avatar
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    start by getting the keel level while using a 4ft level and the front trailer jack, do your measurements off the bottom keel line for rideplate degrees and shoe measurements. the loader bolts into the intake and is at a set amount of drop depending on which brand of loader you have... on a side note, when installing your loader its a good idea to drill the 4 mounting holes through the housing, retap and install longer bolts with lock nuts.

    i too would also recommend a place diverter, it allows for instant adjustments. as for droops, i thought they were more for helping heavier boats get up on plane, instead, i'd look into a snoot from HTP. i put both of these on my 19ft mantra and took off a droop, i really liked the results...

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    Senior Member motomattox's Avatar
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    Is the pump set back? i know probably a dumb question but just double checking. Also, give us some specs on the motor. Cam, heads, carb, intake. Measure off the keel for your shoe and ride plate. 4 degrees on the ride plate is a good place to start. I personally like the Place Diverter more than running wedges. Its a lot easier to adjust the ride as your running than it is to wedge, then run, then wedge, etc. Also, it takes POWER as well as proper setup to get the boat way up out of the water. What are your goals for this boat? Sounds like you need to GPS this thing as well to get MPH. If you know your MPH, your impeller size, and your RPM, that will tell you a lot about the condition of the pump as well as if you need to build more power to get your goals. But again....what is your goal for this boat? Happy 4th by the way
    "Keep talking...it aint often I get to hear a genius speak"

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    Quote Originally Posted by Lildave View Post
    I believe the ride plate is 4 degrees up

    I don't know what flat, back cut, or tapered means?

    I thought at first the shoe was 3/4" below keel, but that was measuring from the flat surface beside the radius of the keel...then somebody told me you had to measure from the bottom of the radius of the keel. I'm not sure if that is true. That is one of my questions.

    I'm VERY new to all of this, but I do know that with the same HP and same boat if you get more of the boat out of the water and reduce drag, you'll go faster and turn more RPM's.

    Maybe my setup is right, and I need a bigger motor? I just don't know what is right and what is wrong.
    Take a look at this site and see the difference between some of the shoe types:
    http://home.pacbell.net/jmcclure/ShoePlate.html
    Yes, measure from the keel at it's lowest point to determine where the shoe is in relation to keel.
    Also, you need a digital angle finder that has a 'zero' feature.... if you don't already have one. You can get a 'Husky' model from Home Depot for around $40. This is how you'll determine rideplate and nozzle angles relative to keel.
    On the rpm's....I don't see how airing your boat out more is gonna make your engine turn the impeller any faster. The reduced drag will result in more speed, but not more r's. Again, I could be mistaken, but I don't believe anything is gonna give you any additional rpm's (with the same impeller) other than additional power or cavitation.
    Hopefully someone like BP or CS will chime in here and enlighten us.
    Last edited by 75 TX; 07-04-2011 at 10:19 PM.

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    Senior Member 79sleek's Avatar
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    Angry yep

    [ QUOTE=75 TX;1443890]Take a look at this site and see the difference between some of the shoe types:http://home.pacbell.net/jmcclure/ShoePlate.htmlYes, measure from the keel at it's lowest point to determine where the shoe is in relation to keel. Also, you need a digital angle finder that has a 'zero' feature.... if you don't already have one. You can get a 'Husky' model from Home Depot for around $40. This is how you'll determine rideplate and nozzle angles relative to keel.On the rpm's....I don't see how airing your boat out more is gonna make your engine turn the impeller any faster. The reduced drag will result in more speed, but not more r's. Again, I could be mistaken, but I don't believe anything is gonna give you any additional rpm's (with the same impeller) other than additional power or cavitation.Hopefully someone like BP or CS will chime in here and enlighten us.[/QUOTE] I just ran my boat with the new diverter and gained 10 mph no change in rpm but getting the boat dry had huge results in speed but not rpm. I would get a diverter ya a little pricey but I gained 10 mph in a 20' sleekcraft I would start there then add other stuff later!!!

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    Senior Member TNYoungblood's Avatar
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    Quote Originally Posted by Lildave View Post
    I believe the ride plate is 4 degrees up

    I don't know what flat, back cut, or tapered means?

    I thought at first the shoe was 3/4" below keel, but that was measuring from the flat surface beside the radius of the keel...then somebody told me you had to measure from the bottom of the radius of the keel. I'm not sure if that is true. That is one of my questions.

    I'm VERY new to all of this, but I do know that with the same HP and same boat if you get more of the boat out of the water and reduce drag, you'll go faster and turn more RPM's.

    Maybe my setup is right, and I need a bigger motor? I just don't know what is right and what is wrong.

    Is this a race boat or lake boat ??

    Man if this is your 1st boat just be careful, its gonna do EVERYTHING quick .. 305 lbs hull belongs on a race track, not out on the lake .. Main thing is do 1 thing at a time and see how the boat responds and record in a log what you have done .. Boat should haul sum azz and not need alot of HP to do it ... JMO Good luck
    Last edited by TNYoungblood; 07-05-2011 at 10:08 AM.
    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

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    Senior Member Lildave's Avatar
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    TNYoungblood.... It's a lake boat, so far it's manners have been pretty good.


    To whoever asked about the style of my shoe.... Looking at those pics, it's tapered.


    Still have no measurements yet on anything else

  14. #12
    Senior Member TNYoungblood's Avatar
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    Quote Originally Posted by Lildave View Post
    TNYoungblood.... It's a lake boat, so far it's manners have been pretty good.


    To whoever asked about the style of my shoe.... Looking at those pics, it's tapered.


    Still have no measurements yet on anything else



    You got a Tater Chip Be safe bud

    And Get yourself a divertor, best $$$$ you can spend at this point
    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

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    Senior Member Lildave's Avatar
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    I like to refer to her as my kneeboard with a big block Lol

    I've been very suprised with the manners of it. I guess because it's so short, the deck doesn't wave at you at all going across the lake. Becuase I have no diverter, the worst manners it has, is it will porpoise up till about 40mph and then it settles down and rides okay. Been fun so far. Makes my girlfriend nervous though, she's used to bigger boats. She wants me to buy a tx19, or a bigger picklefork.

  16. #14
    Senior Member motomattox's Avatar
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    Quote Originally Posted by Lildave View Post
    I like to refer to her as my kneeboard with a big block Lol

    I've been very suprised with the manners of it. I guess because it's so short, the deck doesn't wave at you at all going across the lake. Becuase I have no diverter, the worst manners it has, is it will porpoise up till about 40mph and then it settles down and rides okay. Been fun so far. Makes my girlfriend nervous though, she's used to bigger boats. She wants me to buy a tx19, or a bigger picklefork.
    That's a good woman! Keep her LOL
    "Keep talking...it aint often I get to hear a genius speak"

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