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Thread: Need help with questions/advice about a 1996 16

  1. #16
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    Quote Originally Posted by mattyboy View Post
    here's a late model 16 in flight
    Man this is how I want to go past all of those ski boats that are everywhere on the lake where I live!!!

  2. #17
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    once you get the right setup on yours you will find you can let it run


    this one has a volvo speedmaster E drive on it and a warmed up Ford SB windsor
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    When the sky is grey,look out to sea.
    When the waves are high and the light is dying,
    well raise a glass and think of me...
    When I'm home again,
    boys, I'll be buying!

    My Ride

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  3. #18
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    Quote Originally Posted by mattyboy View Post
    here's a late model 16 in flight
    Looks like it could benefit from a little port tab
    Just because something's old doesn't mean you throw it away !

  4. #19
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    Quote Originally Posted by 45171 View Post
    Nice ride Mattboy- I really like the timeline that you have started. I personally appreciate anything that's older and classic/original and would've probably spent more time shopping for an original boat before buying this one if I knew then what I do now. This was one of those things that I had to have as soon as I saw it and glad that I went for it. Am I'm glad that I did!

    I was hoping to see a picture of that factory installed head , that's one way to get around not having to find a way to climb back into it haha!

    I've felt a little chine walk already when I've been alone in it with the tabs somewhat down going in the high 40's. I can only assume that it will get worse with higher speeds and less hull in the water.

    no head on the 16 that's my new old boat the hornet that has the head

    a good prop solves a lot it will stop porpoising or limit the speed ranges that it occurs will carry the boat at a level angle of attack not to much stern lift or bow lift not sure what the merc guys are running on the 16 Rootsy had his merc alpha ss drive setup running mid 70s you will know when you have the right prop the boat will become predictable

    the 16 actually benefits from a little more wetted surface over the 18 or 22 makes the ride more stable
    When the sky is grey,look out to sea.
    When the waves are high and the light is dying,
    well raise a glass and think of me...
    When I'm home again,
    boys, I'll be buying!

    My Ride

    Come Join Us on The Queen Of American Lakes



    Contact Us

    www.lgdonziclassic.com

  5. #20
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    Quote Originally Posted by Morgan's Cloud View Post
    Looks like it could benefit from a little port tab
    watching that driver in a 16 over the years has been a real pleasure he drives that thing like it was born a part of him
    When the sky is grey,look out to sea.
    When the waves are high and the light is dying,
    well raise a glass and think of me...
    When I'm home again,
    boys, I'll be buying!

    My Ride

    Come Join Us on The Queen Of American Lakes



    Contact Us

    www.lgdonziclassic.com

  6. #21
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    the 16 will take alot more punishment than the passengers can handle that's why I am not in one anymore

    a skilled passenger will assume the position facing fwd both hands on the front of the rail one leg knelt on the passenger bench seat the other foot on the floor
    When the sky is grey,look out to sea.
    When the waves are high and the light is dying,
    well raise a glass and think of me...
    When I'm home again,
    boys, I'll be buying!

    My Ride

    Come Join Us on The Queen Of American Lakes



    Contact Us

    www.lgdonziclassic.com

  7. #22
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    Regarding your prop, we need: engine, drive ratio, what make and pitch prop you now have, GPS MPH, and rpm you get and what you want.

    More than other advice: SEAT TIME.

    John C[/QUOTE

    OK John here is what I'm running...

    • Mercruiser 5.7 estimated to have 400HP
    • Owners manual says the outdrive ratio is a 2.0
    • WOT was 49 MPH at 4,100 RPM
    • Current prop is a Ballistic 14 & 3/8 x 21
    • Spare prop is an Apollo HXS 14 & 1/8 x 19, the original owner replaced it because the RPM's were going to high.


    I just want to find the most appropriate prop to make it as user friendly as possible for now. I can experiment with others as I get to know the boat better. That's my initial thought but I'm happy to listen to anyone else's experiences and can be persuaded

  8. #23
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    ratio is 1.5 ... unless wrong drive on the boat and it still wouldnt be 2.0... no such thing

    Is the 5.7 " built " ? ... where did the 400 hp come from ?

    Last edited by Lenny; 08-02-2017 at 12:56 AM.

  9. #24
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    I have to agree with Lenny's comment re drive ratio, I run a 1.81 and can swing a 23" Lazer at 4800 on a V6 with half your claimed horse power !!

  10. #25
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    lenny is right on your setup if that 21 prop is at 10% slip is a 1.5 ratio

    something is not right I am not a chevy or a merc guy but I would think a sbc would be fine spinning 4500 on a daily basis try the 19 and see what ya get so you have numbers to compare

    running a 19 at 4500 with 10% slip should be around the same speed


    again these numbers surprise me they are what an older volvo numbers look like the merc with trim and better hydrodynamics should be north of 50 easy

    John C just repowered he has a modern lower unit he would be a good benchmark


    as a comparision my 16 with 310hp a volvo 250 with a nose cone and 1.6 ratio ran around upto 60 at 5000 with no trim and no hydrodynamics

    sounds like time you go thru everything
    When the sky is grey,look out to sea.
    When the waves are high and the light is dying,
    well raise a glass and think of me...
    When I'm home again,
    boys, I'll be buying!

    My Ride

    Come Join Us on The Queen Of American Lakes



    Contact Us

    www.lgdonziclassic.com

  11. #26
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    Quote Originally Posted by Lenny View Post
    ratio is 1.5 ... unless wrong drive on the boat and it still wouldnt be 2.0... no such thing

    Is the 5.7 " built " ? ... where did the 400 hp come from ?

    I have a lot to learn guys....

    I am going to have to look into the outdrive ratio further to be certain, I questioned it after posting and learned very quickly that it should not be the correct ratio for a V8 boat.

    The 5.7 is bored .30 and the person who built it estimated it to be at or close to 400HP. He built motors for hydroplane racing and said that he had built several and had enough experience to give an accurate estimate.

    This is current as of 11/17/2016 ***ENGINE***



    • Trick Flow Aluminum Cylinder Heads
    • (Assembled With 2.02 and 1.60 Valves, New Springs, Retainers, Keepers, and Seals)
    • Scat Crankshaft Standard Weight Forged 4340 Steel Internal Balance
    • Scat Connecting Rods 4340
    • IBeam Sealed Power Hypereutectic Pistons and Rings
    • Chevrolet Performance 350 Magnum Marine Hydraulic Roller Tappet Camshaft
    • Comp Cams Magnum Steel Roller Tip Rocker Arms
    • Comp Cams Magnum Pushrods
    • Comp Cams High Energy Hydraulic Roller Lifters
    • Comp Cams Magnum Double Roller Timing Chain and Gear Set
    • Professional Products Steel Harmonic Balancer And Pointer
    • Chevrolet Performance Flex Plate
    • Chevrolet Performance High Volume Oil Pump
    • Weiand Action Plus High Volume Aluminum Water Pump
    • ARP High Performance Series 8740 Chromoly Steel Bolts Used Throughout
    • FelPro Gasket Kit
    • Edelbrock Performer Intake Manifold
    • Edelbrock Marine Carburetor (Installed)
    • QuadraJet Marine Carburetor (Spare)
    • K&N Flame Arrestor
    • New Custom San Juan Engineering Fresh Water Cooling System
    • EMI Thunder Polished Aluminum Exhaust System (AntiFreeze Cooled Manifolds)
    • New Fuel Pump
    • Braided Stainless Steel Fuel Lines
    • New Ignition Components With NGK Iridium Spark Plugs
    • Remote Oil Pump Out


    Thank you for the time & help btw

  12. #27
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    21" pitch at 4100 with NO slip would indicate about 54 mph WOT with a 1.5. But, you are missing a thousand rpm, 4100 is like a high cruise. At 5000 rpm you would see 66 with NO slip.


    Something is amiss.

  13. #28
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    Quote Originally Posted by Lenny View Post
    21" pitch at 4100 with NO slip would indicate about 54 mph WOT with a 1.5. But, you are missing a thousand rpm, 4100 is like a high cruise. At 5000 rpm you would see 66 with NO slip.


    Something is amiss.
    What is "slip" and what else do you need to know from me?

  14. #29
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    Quote Originally Posted by Lenny View Post
    21" pitch at 4100 with NO slip would indicate about 54 mph WOT with a 1.5. But, you are missing a thousand rpm, 4100 is like a high cruise. At 5000 rpm you would see 66 with NO slip.


    Something is amiss.
    yes in a perfect world no slip using 10% slip is also a bit optimistic too


    they don't have HD or a lower ratio on the alpha 1.47 is the lowest? the bravo has a 1.3 something right??

    something is holding the motor back or other??????????????
    When the sky is grey,look out to sea.
    When the waves are high and the light is dying,
    well raise a glass and think of me...
    When I'm home again,
    boys, I'll be buying!

    My Ride

    Come Join Us on The Queen Of American Lakes



    Contact Us

    www.lgdonziclassic.com

  15. #30
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    It looks like we're starting to get to the facts. Are you sure your tach is reading correctly? (During my Repowering the shop found mine was good up to a certain rpm, then went 1000 rpm low). Are you using gps for speed? I don't have a Merc drive but the reduction ratio may be stamped or noted on a tag.

    Using your numbers, prop slip is an impossible -20%. At a 1.5 ratio, slip is a reasonable 10%. Is the engine unable to turn faster than 4100 rpm? Sound starved? Hiccups? Something is wrong with the numbers. You should get minimum high 50's with 400 hp and a 21" prop.

    My oem 5.0 HO best ever, cool day, alone and half tank of fuel, was 59.8 GPS @ 4,850 rpm using a tweaked SST 21" prop. Best info I could find says I had 200 HP from that engine.

    John C
    '92 Sweet 16 302 Ford-Reborn in 2017
    Windshields are for Sissies !!!

    If you're lucky enough to live on the St. Lawrence River, you're lucky enough!!!

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