What is the ultimate jet boat engine combination for a low maint, 7 second qtr mile
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What is the ultimate jet boat engine combination for a low maint, 7 second qtr mile

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    Senior Member badbug3's Avatar
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    Default What is the ultimate jet boat engine combination for a low maint, 7 second qtr mile

    I would like to know what the site members ideas would be for the ultimate engine combination to have fairly low maintenance and have enough power to run a 7 second quarter mile drag race and be able to run it on regular lake weekends without killing it. Assuming its in a jet boat designed for the task, like an eliminator, stealth, placecraft etc. Things like conv heads, spread port heads, stroke, bore, induction power adder? Head cc's, Blocks, cranks, rods, cubic inch, etc?

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    Senior Member EVILFORCE's Avatar
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    Quote Originally Posted by badbug3 View Post
    I would like to know what the site members ideas would be for the ultimate engine combination to have fairly low maintenance and have enough power to run a 7 second quarter mile drag race and be able to run it on regular lake weekends without killing it. Assuming its in a jet boat designed for the task, like an eliminator, stealth, placecraft etc. Things like conv heads, spread port heads, stroke, bore, induction power adder? Head cc's, Blocks, cranks, rods, cubic inch, etc?

    I think you need to conceder a second boat.
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    Senior Member steveo143's Avatar
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    This should be good for 20 pages!
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    steelcomp was here
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    Quote Originally Posted by steveo143 View Post
    This should be good for 20 pages!
    LOL...seven second, low maintenance, weekend boat?

    Bad bug...can you define your idea of low maintenance? That may be different for you than others.
    I'd say something with a lot of cubes, reasonable compression for pump gas on the weekends, and a ton of NOS at the track.
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    Is it even possible to make a low maintenance and 7 second jet boat? There were few jet boats in the fuel jetboat class that could run 7 seconds and nearly all of those no longer exist due to being crashed.

    The thought of putting one of those boats on the lake in not realistic. (I don't think anyway)

    In order for a jet boat to run 7 seconds means speeds in the 150-165 mph range. Again, I don't think that is realistic on the lake. Not for me anyway.

    I am a flat guy, so what do I know?

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    LP-25.com Infomaniac's Avatar
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    I'm sure you know a lot but just not about jets.

    I'm pretty sure most if not all of the 7 sec NJBA guys take theirs to the lake. And run in the 130's

    Quote Originally Posted by jimsplace View Post
    Is it even possible to make a low maintenance and 7 second jet boat? There were few jet boats in the fuel jetboat class that could run 7 seconds and nearly all of those no longer exist due to being crashed.

    The thought of putting one of those boats on the lake in not realistic. (I don't think anyway)

    In order for a jet boat to run 7 seconds means speeds in the 150-165 mph range. Again, I don't think that is realistic on the lake. Not for me anyway.

    I am a flat guy, so what do I know?
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    mo balls than $cents$ IMPATIENT 1's Avatar
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    big cube (555 or bigger) all alum longblock, blowthru dominator,no ic's, twin gt4788's be a monster at the lake on pumpgas, crank it up and run c16 at the track it'd make an easy 2200hp/ftlbs on the good gas. that's what id build if i had a nice hull capable of 130+ and the $$$ to build the engine setup, be as low maintenance as it'd get for the power level.

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    Senior Member wagspe208's Avatar
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    Those west coast guys must be magic. There are no "reliable" 8.0 "sec 1/4 mile low maintenance jet boats" back here.
    That being said I admire a man with a dream.
    Wags

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    Senior Member snoopjonnyjon's Avatar
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    Having been lurking in this forum for a very long time, I think I know the formula.

    Find a wrecked Suburban.

    990 heads, tunnel ram, dual 660 carbs blown through by a turbo from a Cummins N14. If you can get the compression down around 5:1 it will run on cat piss.

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    Quote Originally Posted by Infomaniac View Post
    I'm sure you know a lot but just not about jets.

    I'm pretty sure most if not all of the 7 sec NJBA guys take theirs to the lake. And run in the 130's
    Are those true 7 second boats or 8 second boats that can run high 7's? I was referring to a true 7 second boat.

    Again, I am not a jet guy and maybe what I remember is incorrect. It wouldn't be the first time.
    Last edited by jimsplace; 01-06-2011 at 10:34 AM. Reason: spelling

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    Senior Member bp298's Avatar
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    Quote Originally Posted by badbug3 View Post
    I would like to know what the site members ideas would be for the ultimate engine combination to have fairly low maintenance and have enough power to run a 7 second quarter mile drag race and be able to run it on regular lake weekends without killing it. Assuming its in a jet boat designed for the task, like an eliminator, stealth, placecraft etc. Things like conv heads, spread port heads, stroke, bore, induction power adder? Head cc's, Blocks, cranks, rods, cubic inch, etc?
    what do you mean by "7 second quarter mile drag race"? do you mean a boat that, all out, can break into the 7s, maybe a 7.95 all out? or a boat that will run 7.00s?

    by "run it on regular lake weekends", do you mean "take it off the trailer, go 200 yards and park it on the beach"? or do you mean put some serious lake/river hours on it?

    Quote Originally Posted by Infomaniac View Post
    I'm sure you know a lot but just not about jets.

    I'm pretty sure most if not all of the 7 sec NJBA guys take theirs to the lake. And run in the 130's
    2 of 'em do, with barrels of race gas, the rest of 'em don't unless it's a very controlled test, not even close to "regular lake weekend" running all over the place.

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    Senior Member stix818's Avatar
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    I'm not a jetboat guy either but low maintenance and 7.00 jet is an oxymoron.. DeClark, Morgan and John D are really the only ones close to or capable of running a real low 7 and I don't think any of their stuff is low maintenance.. I don't know what John D is running combination wise but I'm pretty sure DeClark and Joe are running some Pro Stock style equipment and unless things have changed, I'm pretty sure it's not low maintenance.. Just assuming here!!!
    Last edited by stix818; 01-06-2011 at 12:31 PM.
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    Senior Member bp298's Avatar
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    Quote Originally Posted by wagspe208 View Post
    Those west coast guys must be magic. There are no "reliable" 8.0 "sec 1/4 mile low maintenance jet boats" back here.
    That being said I admire a man with a dream.
    Wags
    ok, here's a question. is your hydro a "reliable, low maintenance" deal??? "low maintenance" seems somewhat subjective, and since badbug isn't more specific, hard to know what someone's illusion might be.
    not far fetched at all to build a "reliable" 8 second jet.

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    Senior Member badbug3's Avatar
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    I would say if a boat can run a 7 something quarter mile, it is a 7 second boat. I dont mean 7 o bracket. An 8 second boat would run 8 something. ''

    Now Steve morris built a 2100 hp pump gas 540 motor for everyone to see, but how much power would it make on pump gas without the garbage can full of ice? Had profiler heads too. Would upping the octane be enough to make up the difference in power loss from loss of ice water inlet temps? So at 6800 rpm's how much maintenance would that motor need on an occassionaly quarter mile blast?

    I dont mean be stupid and try to run 7 seconds on the lake !!! I mean tone it down some.

    From what i have observed in last few years, a 19 ft stealth i have seen in person ran high 7's with 1200 hp motor and 250 hp nitrous. And that was a rather heavy laid up stealth and several years ago. Also i saw first hand , several jets running real fast 8 o's with 1600 hp or so and some were turned down to run that.

    Look at unchained's motor, its low maintenance and powerful, but what would make it even better?

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