16ft Mantra Tunnel
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16ft Mantra Tunnel

  1. #1
    Senior Member Lildave's Avatar
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    Default 16ft Mantra Tunnel

    I bought a 16' Mantra Tunnel hull a few months ago with a blown engine and haven't got it in the water yet. The motor has been pulled and fixed and just needs dropped back in. This is my first jet boat, and the guy I bought it from was not very helpful with info or anything for that matter. Does anybody here have experience with these boats? Just wondering what to expect from it.

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    Senior Member Alter Ego's Avatar
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    I think that Tom E has a boat like what you are talking about. Search the forum for posts under Impatient1, if nothing else, I am sure that he will be chiming in as soon as he sees the topic. He has searched all kinds of info on these hulls. Post up some pics. I have only see two of them, including Toms. Congrats on the new ride by the way.

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    pics man pics!

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    Senior Member Lildave's Avatar
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    I have several pics but I get on here on my iPhone.... I'm not sure how to post them from here?

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    hey ive got 1 too, worked on it alllll weekend trying to hurry up and set my engine in

    Dare to be different, if it turns out great you can claim you planned it that way.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    here's mine, looks nothing like this anymore tho, i brought back the gel and she shines awesome now! doin and interior revamp as we speak and then dropping in my engine so i can finally hear the phucking thing built a nice tight pump with a htp detailed b-cut, 800hp/ftlbs+ pumpgas ls sbc turbo engine and have started on a bigger cubed shortblock that'll make 1100hp pretty easy with my same turb kit and carb.






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    Senior Member Lildave's Avatar
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    Looks like an LS engine? That's actually my plan for next year is to lighten it up a bit with an LS3. I came from drag racing an 02 Ws6 to boats... So I'm a little out of my element with this carb'd BBC. I'll try and get some pics up but my base color is red with black and white stripes. Have you ever had yours in the water to know how it handles?

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    Senior Member Lildave's Avatar
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    Is that a built race gas motor? How are you going to make 800+ with no IC?

  11. #9
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Lildave View Post
    Is that a built race gas motor? How are you going to make 800+ with no IC?
    good eye bro, 3 nozzle ais water/meth injection the turbo is a custom built from jose at forced inductions, worth 125+lbs 80mm. it'll be ran on nothing but -20* washer fluid(spiked with more methanol, bout 60% meth) and 91 pumpgas



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    Last edited by IMPATIENT 1; 11-08-2010 at 06:51 AM.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Lildave View Post
    Looks like an LS engine? That's actually my plan for next year is to lighten it up a bit with an LS3. I came from drag racing an 02 Ws6 to boats... So I'm a little out of my element with this carb'd BBC. I'll try and get some pics up but my base color is red with black and white stripes. Have you ever had yours in the water to know how it handles?
    nope, never seen this hull before till i saw it sittin by someone's barn and had to have it the previous owner had a bbf in it with 700hp and ran 110 on a sdba 1000ft track. figure it'll do better than that with 200lbs less weight and 200ftlbs/100hp more. when i get the 1100hp iron blocked ls1 shortblock done i'll swap it into the boat and and hopefully itll be so quik from the holeshot itll be uncatchable. from what im told they're super quik hulls, damn sure unique which is why i bought it, i'm alil different
    i've gotta all alum 6.2liter i may end up using at some point, but the 1100hp ls1 otta do the job and be more power than i need anyways
    Last edited by IMPATIENT 1; 11-08-2010 at 06:57 AM.

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    Senior Member Lildave's Avatar
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    Yeah I hear ya.... I hate having the same thing as somebody else. I found mine on Craigslist in Meridian MS. It had been sitting in a barn 15 years so of course it spun a few rod bearings when the guy fired it up in his driveway gonna warm it up when I was on the way to get it. I've converted my trailer to single axle now and it pulls SO much better IMO. I've got a buddy that runs a vinyl shop close to me, so it's fixing to get wrapped in vinyl something really wild looking. Did you build all of your piping for your turbo setup or is that bought from somewhere?

  14. #12
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Lildave View Post
    Yeah I hear ya.... I hate having the same thing as somebody else. I found mine on Craigslist in Meridian MS. It had been sitting in a barn 15 years so of course it spun a few rod bearings when the guy fired it up in his driveway gonna warm it up when I was on the way to get it. I've converted my trailer to single axle now and it pulls SO much better IMO. I've got a buddy that runs a vinyl shop close to me, so it's fixing to get wrapped in vinyl something really wild looking. Did you build all of your piping for your turbo setup or is that bought from somewhere?
    i used gm performance parts 1/2in thick header flanges and bought the rest of the thick walled mild steel header piping off the net, cant remember where exactly built it myself and had embee performance coat all of it including the turbo exhaust turbine housing, its copper coated inside. should be at 5lbs by 3500rpms, 10lbs by 5k, 18lbs by 5500 range, my cam peaks at 6500 so that's where ill be runnin the motor at 18lbs at. im boring a 5.3 to ls1 bore, using the stock 5.3 crank and goin with diamond ls1 dished pistons/scat 6.125 rods and ill run that motor at 25lbs im a gm tech, so ive got plenty of ls's
    the turbo is real big on the compressor side and by the map i was told to go by, i'll be in the 80%+ efficiency island so my intake air temps with the 3 nozzle injection should be in the 70-80* range at full boost, which is bout as good as it gets.
    Last edited by IMPATIENT 1; 11-08-2010 at 07:17 AM.

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    Senior Member Lildave's Avatar
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    Is a 5.3 not wet sleeved like the 5.7?

    What is a detailed impeller?

    If mine breaks 100mph I'll be tickled pink for this coming season atleast. This is my lake boat lol.

    Does your hull bow in like cardboard when you put much more than a finger on it? Mine does... And makes crackling noises sometimes.

    Gonna be a learning experience for sure!

  16. #14
    "Need For Speed" Gearhead's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    nope, never seen this hull before till i saw it sittin by someone's barn and had to have it the previous owner had a bbf in it with 700hp and ran 110 on a sdba 1000ft track. figure it'll do better than that with 200lbs less weight and 200ftlbs/100hp more. when i get the 1100hp iron blocked ls1 shortblock done i'll swap it into the boat and and hopefully itll be so quik from the holeshot itll be uncatchable. from what im told they're super quik hulls, damn sure unique which is why i bought it, i'm alil different
    i've gotta all alum 6.2liter i may end up using at some point, but the 1100hp ls1 otta do the job and be more power than i need anyways
    Tom.... the engine looks great. Can't wait to see the full combo run. I know your a little different and that is what makes it all fun Should be interesting. I like your new school approach to the old jetboats. I'm fairly new school in the race car, but a bit of old school approach on the boats. What I am trying to learn is better ways to optimize my old school boat approach.

    Gear
    Last edited by Gearhead; 11-08-2010 at 07:43 AM.

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