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  1. #31
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    Quote Originally Posted by VectorPat View Post
    I find it hard to believe that. The engines are rated at that not bolted to anything and making all those 90 deg turns thru all of those gears is going to drag it down.
    It's also printed in the brochure and on the website. I'd find it hard to believe that after all of the class action lawsuits that various manufacturers have had to deal with over horsepower mis-statements that they'd be dumb enough to print something untrue.

    As for the base engine it's a bit of a mystery. Yes the Marine LSA is rated at 530 HP but keep in mind that it's pretty much the same motor is in the Caddy CTS V and that one puts 556 HP to the ground. I suspect that they play with either the level of boost or other parameters in the base tune to get the HP they claim.

  2. #32
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    Quote Originally Posted by Tom Foley View Post
    Hydraulic power transmission to the lower unit is what I heard . No main driveshaft , hoses .

    Nope. The cutaway that I should have taken a pic of had a shaft coming down that drove a second short shaft. The two shafts each had a pinion gear that drives the propshaft. The shifting happens somewhere above all this.
    13' Biel tunnel AKA "Flight Risk"
    13" Modified Yamaha V4 - 101 mph

    21' Paramount
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  3. #33
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    They posted 81 mph on their Faceboook the other day. Still, that's damn good for 2 motors on a 38' Fountain, considering it took 4 300XS motors to get that boat into the mid 80's.
    considering they weigh 1050lbs a piece..
    <img src=http://www.screamandfly.com/image.php?type=sigpic&userid=36953&dateline=1479911186 border=0 alt= />

  4. #34
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    Quote Originally Posted by cptunnel View Post
    considering they weigh 1050lbs a piece..
    Which is a lot less than 4 Optis and less drag than having 4 lower units in the water.

    The other advantage I see is that the chance of having problems with one of 4 motors hanging off your transom is twice as having it with two.
    13' Biel tunnel AKA "Flight Risk"
    13" Modified Yamaha V4 - 101 mph

    21' Paramount
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  5. #35
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    I had the pleasure of meeting with both Eric (son) and Rick (dad) Davis a few months back, to discuss possible government interest. Every question I had was answered fully and legitimately. I was pleasantly surprised with the prototype production unit's layout and engineering.The pieces are all shelf units with proven track records. Now if they can all play nice together time will tell. I have met with other "start-ups" in the past and these gentlemen seem to have their act together more than any others. I hope the future bids well for them.
    18 Talon/2.4 carb SOLD
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  6. #36
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    I cant find anything that states it being propshaft horsepowerhttp://www.seven-marine.com/motors/specifications/ and I also dont see anything stating the caddy is rear wheel hosrepower and I have never seen a car advertising its rear wheel horsepower. The only thing I have found is caddy video and it dynoed 457 rwhp.http://youtu.be/SmnMDMm6Gao I know there are all kinds of things they can do to get more power but i really doubt they did as that was the original purpose of using that engine as it was already a proven package.
    Fellow G-Man of the Sunshine Syndicate-Dixie Wrecked Chaptor..
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    94 17MA Maverick 115 Yamaha
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  7. #37
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    The other advantage I see is that the chance of having problems with one of 4 motors hanging off your transom is twice as having it with two.
    yes
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  8. #38
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    Quote Originally Posted by VectorPat View Post
    I know there are all kinds of things they can do to get more power but i really doubt they did as that was the original purpose of using that engine as it was already a proven package.
    Quote Originally Posted by Ziemer View Post
    They posted 81 mph on their Faceboook the other day. Still, that's damn good for 2 motors on a 38' Fountain, considering it took 4 300XS motors to get that boat into the mid 80's.
    Generally speaking in round numbers... (4) 300XS @300hp or so each totals 1200 HP which equals mid 80 MPH speeds on a similar hull. So a pretty safe assumption is that a similar boat with (2) 557's doing 80 MPH should have at least 1100 HP. Again the math is fuzzy but I doubt that they are getting there with only 425 HP each (assuming 20% loss if 557 is CSHP).
    Last edited by Stitch King; 02-19-2013 at 09:42 AM.

  9. #39
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  10. #40
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    Quote Originally Posted by mackeral5 View Post
    Most of the whine you're hearing is the tranny, same sound an inboard skiboat makes. The gearcase itself doesn't shift...
    I don't like the whine sound!!

  11. #41
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    The LSA in the CTS-V is making that power through a six speed slushbox, 3 goofy rubber mount U-Joints, rear end, CV shafts and 4 joints, full exhaust, factory manifolds, extremely forgiving timing, and 4 cats. 557hp in that trim with a conservative marine tune is a very believable number.
    > Stainless steel Merc cowling plates - $110 shipped TYD - LINK <

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  12. #42
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    You covered it right there Jim. Not that I could ever afford one, but what gearhead wouldn't love this stuff. Whine/whistle whatever... Lockjaw, were you just whining about the whine? I like that part the best. If it aint whinning it aint making power.
    Sounds great, looks good, last a long time??? We will see. Thanks for sharing in any case. I got wood.

  13. #43
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    I agree the motor has to be putting out somewhere around that to achieve those speeds. Also having 2 less big a$$ gearcase dragging thru the water is going to help with speed also. Ive just been curious about what HP they do really put out.
    Fellow G-Man of the Sunshine Syndicate-Dixie Wrecked Chaptor..
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    94 17MA Maverick 115 Yamaha
    2006 Mustang GT, with a belt driven air cleaner

  14. #44
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    Quote Originally Posted by Lockjaw View Post
    I don't like the whine sound!!
    The motor or the forum members?
    13' Biel tunnel AKA "Flight Risk"
    13" Modified Yamaha V4 - 101 mph

    21' Paramount
    Mercury 300 Promax

  15. #45
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    Cool

    on the road is one thing, on the water seems to be another, the 60 series detroit at best in the commercial (ie trucking application) is at the high end 600 hp. in the marine application 800+. don't ask me why, probably something to do with resistance and reliability. road motors are exposed to far more nasty inhalents than clean air boat motors. fact
    most overnite successes usually take at least 10 years


    Certified turd polisher,

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