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  1. #31
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    Quote Originally Posted by Jimboat View Post
    Charlie, what does your boat weigh?
    1630 with oil and battery.
    The center of gravity is 51" forward of transom.
    Last edited by CharlieN; 10-03-2014 at 10:37 AM.
    Regards,
    Charlie North
    If it ain't broke, modify it.
    80 21' Superboat with Yamaha 225 Excel power
    76 Glastron to be powered by a 6.2 L92 with surface drive
    87 Glastron CVX20 Hull

  2. #32
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    The 1984 Glastron CVX17 pad bottom is maybe a hull design you want to check out. We have one and can do 45mph with two people and 75hp

  3. #33
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    Quote Originally Posted by CharlieN View Post
    1630 with oil and battery.
    The center of gravity is 51" forward of transom.
    With your current power and light weight hull, you're right around the top speed that I would expect - perhaps just a couple mph more maximum. Not sure a pad would help you too much.

  4. #34
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    Quote Originally Posted by Jimboat View Post
    With your current power and light weight hull, you're right around the top speed that I would expect - perhaps just a couple mph more maximum. Not sure a pad would help you too much.
    Interesting,
    Come spring this will have an Excel on the back so an estimate of close to 240Hp is what I will be working with.
    Regards,
    Charlie North
    If it ain't broke, modify it.
    80 21' Superboat with Yamaha 225 Excel power
    76 Glastron to be powered by a 6.2 L92 with surface drive
    87 Glastron CVX20 Hull

  5. #35
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  6. #36
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    Ford 302 CI - boss 302 block and crank. Aluminum aftermarket Jim Valakeo ported heads, 12 to 1 ratio pistons, solid roller cam, high rise intake and throttle body fuel injection. MSD ignition, Custom one off through transom headers.
    engine raised 3 inches and Alpha SS drive. Still had the gas tank in front. That was going to be the next project. Then sold the boat when I bought the Checkmate 251.

  7. #37
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    So 370 to 425ish power? With the drive setup what was your propline below hull, 3½ish? I am thinking I will be starting with a 5.3 aluminum LS engine, the small bore since they hold up better with a supercharger. I will first run NA though. I was thinking a hybrid Bravo SSM5 drive but I doubt I will come up with a SSM5 lower I can afford. So possibly a shortened Bravo upper with SSM3 lower. Hull will either be a CVX20 Deluxe converted to sterndrive from the jet or one of George Linders 21s.

    I intend to start collecting parts this winter but I need to finish my current boat first. One thing I did when I rebuilt the structure in this hull is to eliminate the aft 4' of center stringer, call it much as the car motor versions would be thus allowing for the fuel tank below floor.
    Regards,
    Charlie North
    If it ain't broke, modify it.
    80 21' Superboat with Yamaha 225 Excel power
    76 Glastron to be powered by a 6.2 L92 with surface drive
    87 Glastron CVX20 Hull

  8. #38
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    Excel powerhead, Pad, cut in step, good prop and more setback should do it. One more thing to think about. Gear ratio. You either have 1.87-1 or 2.0-1 as both came on the 150hp models. The Excel came with 1.80-1 so if you keep the 150 gears you need to be thinking about larger pitch props.
    Question: Is the Excel powerhead complete with the correct carbs and heads?

    DB

  9. #39
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    If you are gonna stuff the ls very hard, I would think a steel truck block would be more reliable for the build. I know it's heavier, but they are a lot stronger.

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  10. #40
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    Quote Originally Posted by Da Bull View Post
    Excel powerhead, Pad, cut in step, good prop and more setback should do it. One more thing to think about. Gear ratio. You either have 1.87-1 or 2.0-1 as both came on the 150hp models. The Excel came with 1.80-1 so if you keep the 150 gears you need to be thinking about larger pitch props.
    Question: Is the Excel powerhead complete with the correct carbs and heads?

    DB
    The Excel powerhead is complete, I have two sets of 34 carbs and Excel heads. My 150 did not have the original 2.0 gears, it has a somewhat salty lower with 1.87. Eventually I want a fresher lower, an Excel unit would be nice.
    My current 150 has 34 carbs on a ported horizontal front with CCR reeds, bearing webs are stuffed.
    I have the controller for the Excel minus coils. Not sure which ignition to run for lake use with 91 oct non Ethanol.
    I currently am using an 8" setback lift, this can easily be changed.

    My engine now just pulls 5100 rpm with 23 and 25 pitch props, this is with the restrictive 150 ProV tuner so I expect there is room for the Excel to rev with what props I have to start with at least. When I change the tuner I will be restricting some water flow in the mid.
    Regards,
    Charlie North
    If it ain't broke, modify it.
    80 21' Superboat with Yamaha 225 Excel power
    76 Glastron to be powered by a 6.2 L92 with surface drive
    87 Glastron CVX20 Hull

  11. #41
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    Quote Originally Posted by XstreamVking View Post
    If you are gonna stuff the ls very hard, I would think a steel truck block would be more reliable for the build. I know it's heavier, but they are a lot stronger.
    The LS I intend would be in the 550ish range which my local guy says is fine with the small bore block. I have allot to learn still with these.
    Regards,
    Charlie North
    If it ain't broke, modify it.
    80 21' Superboat with Yamaha 225 Excel power
    76 Glastron to be powered by a 6.2 L92 with surface drive
    87 Glastron CVX20 Hull

  12. #42
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    At 5100rpm your far of from what a stock Excel will do. I raced with two of them on two different style boats and both liked the 6700rpm range with anywhere from a 28 to a 32p prop. We had the rev limiter disconnected but other than that they were all stock.

  13. #43
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    I expect the restrictive tuner is holding this engine back but I have read of other ProV that have reved higher, It will be interesting to see both what the Excel will offer as well as getting the hull to run freer.
    The chopper prop will be in my hands mid day Monday, I am looking forward to seeing what it offers and finally seeing how things react to raising the engine since the Predator does not like running high.
    Regards,
    Charlie North
    If it ain't broke, modify it.
    80 21' Superboat with Yamaha 225 Excel power
    76 Glastron to be powered by a 6.2 L92 with surface drive
    87 Glastron CVX20 Hull

  14. #44
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    Chopper prop with weed cutters is mounted up and waiting for a test run.
    Regards,
    Charlie North
    If it ain't broke, modify it.
    80 21' Superboat with Yamaha 225 Excel power
    76 Glastron to be powered by a 6.2 L92 with surface drive
    87 Glastron CVX20 Hull

  15. #45
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    I made my first test with the Chopper, this is an A5 26p. It does not run as fast as the 25p Predator I have been running at cruise or top speed, the Predator tops at 61.8 @5100 revs loaded or running light. The Chopper I was seeing 55 ish, the GPS shown 57 at one short point, I was seeing what may have been 5200 revs. Raising the engine would get an rpm rise without speed increase similar with trim. It did not blow out but when raise to the point the prop was above the hull bottom it was all I could do to hold the steering. Defiantly ways from where the skeg is adjusted.
    Nice thing I really like is the prop holds in corners, this was the first time I have had this hull cornering at 1G+, the predator would not let the hull corner better than .7G. Being a sports car guy that is lazy.
    The photos my wife got shows the hull running flat with more water kicked up depending what trim or drive height I was running.

    So next is to rework the bottom of the hull over the winter. Before that I have a 50+ mile river run coming up and not truly sure which prop I will run.
    Regards,
    Charlie North
    If it ain't broke, modify it.
    80 21' Superboat with Yamaha 225 Excel power
    76 Glastron to be powered by a 6.2 L92 with surface drive
    87 Glastron CVX20 Hull

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