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  1. #1
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    How many Inches of Set Back on HydroStream V hulls???

    I have an 85 V - Hull and want to go from CMC jack only to 9 1/2" by adding a Sea Star 4" mechanical jack can someone explain why so Many boats in this hull run better with motor farther back? years ago my HST would NOT run with CMC only and ran excellent with 11" of set back, 2 way different hulls but set back seems to really help top end. And the overall "balance" of boat. Your thoughts appreciated.




    Previous Boats:

    77' Switzer Craft 72 mph 175 hp
    86' Lazer LTV 80 mph 200 hp
    90' HST Bridgeport 97 mph 250 hp
    86' Valero YT 80+ mph 200 hp
    79' Vector 80+ mph 200 hp 85' Valero V 83+ mph/ Current 200
    88 Valero YT not so fast, no good motor
    NOW 85' Valero Vee 2.4 Bridgeport Carbs

  2. #2
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    Generally, the more set back the more bow lift. Each boat has it's own sweet spot. I run a 5'' jackplate for convenience. But my boat would run better with no setback.

    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

  3. Likes David - WI liked this post
  4. #3
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    Cool

    [QUOTE=XstreamVking;2932674]Generally, the more set back the more bow lift. Each boat has it's own sweet spot. I run a 5'' jackplate for convenience. But my boat would run better with no setback.[/QUOTE


    So, does that mean with more setback i can use less trim and keep motor more verticle? that would be good
    JimLowe




    Previous Boats:

    77' Switzer Craft 72 mph 175 hp
    86' Lazer LTV 80 mph 200 hp
    90' HST Bridgeport 97 mph 250 hp
    86' Valero YT 80+ mph 200 hp
    79' Vector 80+ mph 200 hp 85' Valero V 83+ mph/ Current 200
    88 Valero YT not so fast, no good motor
    NOW 85' Valero Vee 2.4 Bridgeport Carbs

  5. #4
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    In my sig pic I am running 5'' set back and you can see the motor is dead level. That was turning a 28p lightning et prop at 6k. Mid 80's or so....My bottom is blueprinted, straight, with sharpened strakes. Fuel and battery in the stern. Your boat may run similar depending on the bottom and weight placement.

    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

  6. #5
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    yes! looks very level, my boat is like yours an 85? and that is running very level. Nice! mid 80's with how many people and H.p. ? looks great!




    Previous Boats:

    77' Switzer Craft 72 mph 175 hp
    86' Lazer LTV 80 mph 200 hp
    90' HST Bridgeport 97 mph 250 hp
    86' Valero YT 80+ mph 200 hp
    79' Vector 80+ mph 200 hp 85' Valero V 83+ mph/ Current 200
    88 Valero YT not so fast, no good motor
    NOW 85' Valero Vee 2.4 Bridgeport Carbs

  7. #6
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    Here is my valero
    Attached Thumbnails Attached Thumbnails fast Valero.JPG  




    Previous Boats:

    77' Switzer Craft 72 mph 175 hp
    86' Lazer LTV 80 mph 200 hp
    90' HST Bridgeport 97 mph 250 hp
    86' Valero YT 80+ mph 200 hp
    79' Vector 80+ mph 200 hp 85' Valero V 83+ mph/ Current 200
    88 Valero YT not so fast, no good motor
    NOW 85' Valero Vee 2.4 Bridgeport Carbs

  8. #7
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    Low 80's with 2. That was a 225 3.0 liter EFI. Runs about he same speed with a tuned 2.5 200 EFI with same prop, but closer to 7000. (1.75 vs 1.87 gears) I am not reaching it's full potential since I do not trim past level as I want to stay dry.....Give it any pos trim and it will fly the nose real easy. Boat is fully re-built with foam and core board. Much lighter than original.
    Last edited by XstreamVking; 03-02-2017 at 07:33 PM.

    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

  9. #8
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    Quote Originally Posted by XstreamVking View Post
    Low 80's with 2. That was a 225 3.0 liter EFI. Runs about he same speed with a tuned 2.5 200 EFI with same prop, but closer to 7000 K. (1.75 vs 1.87 gears) I am not reaching it's full potential since I do not trim past level as I want to stay dry.....Give it any pos trim and it will fly the nose real easy. Boat is fully re-built with foam and core board. Much lighter than original.
    Very Nice!




    Previous Boats:

    77' Switzer Craft 72 mph 175 hp
    86' Lazer LTV 80 mph 200 hp
    90' HST Bridgeport 97 mph 250 hp
    86' Valero YT 80+ mph 200 hp
    79' Vector 80+ mph 200 hp 85' Valero V 83+ mph/ Current 200
    88 Valero YT not so fast, no good motor
    NOW 85' Valero Vee 2.4 Bridgeport Carbs

  10. #9
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    Thanks, It's a good old boat and drives nice. Check out the vids of it running on my links. 2nd Hydrostream vid was with the 3.0 Swamp cabbage run was with the 2.5....

    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

  11. #10
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    From looking at the pic of yours, it might use 6'' of set back. Trim is quite high, bottom may have some hook. They all did from the factory. What are the prop type/pitch and revs?

    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

  12. #11
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    Quote Originally Posted by XstreamVking View Post
    From looking at the pic of yours, it might use 6'' of set back. Trim is quite high, bottom may have some hook. They all did from the factory. What are the prop type/pitch and revs?
    well thats what Frank Mondello (fb) of New York said he had a Viper with a 2.5 mid 90's with 10" set back, i will have 9 1/2" when i add my Sea Star 4" mechanical i ordered. i have good props, but this pic was with my modified 200 hp with cut heads but still best of 77 mph at like 6,100 rpms with i think? my 30" DAH cleaver he made more bow lift, amazing for a Cleaver.
    i also have a 29" Mazco Re3 and Allison cut 28" (big ear) and i never got to run them?
    Recently we sold that motor, end of season, and put a nice fresh 2.4 Brideport carb, 1990, we unfortunately only ran 81 mph with a very hard to spin Mazco Re4 28" i WILL BE SELLING on Scream. A. I must get the Rpm's up, so engine runs strong H.P. and B. i must get more set back i believe, so less trim and more handling, Frank in New York said his Viper was so balanced he could take his hands off the wheel at 90 mph and perfect balance! i dont do that stuff, but that is a balanced boat. We are shooting for mid 80's with 3 to 4 adults, run at 81 mph, since Rpm's were so low. flat out, jack up all the way, but conservative on jack, not bolted super high. only maybe an inch above jack.




    Previous Boats:

    77' Switzer Craft 72 mph 175 hp
    86' Lazer LTV 80 mph 200 hp
    90' HST Bridgeport 97 mph 250 hp
    86' Valero YT 80+ mph 200 hp
    79' Vector 80+ mph 200 hp 85' Valero V 83+ mph/ Current 200
    88 Valero YT not so fast, no good motor
    NOW 85' Valero Vee 2.4 Bridgeport Carbs

  13. #12
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    yes, i saw the core pics, Top Notch job! wow, blueprinted bottom, what is year again?




    Previous Boats:

    77' Switzer Craft 72 mph 175 hp
    86' Lazer LTV 80 mph 200 hp
    90' HST Bridgeport 97 mph 250 hp
    86' Valero YT 80+ mph 200 hp
    79' Vector 80+ mph 200 hp 85' Valero V 83+ mph/ Current 200
    88 Valero YT not so fast, no good motor
    NOW 85' Valero Vee 2.4 Bridgeport Carbs

  14. #13
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    1983....

    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

  15. #14
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    You're not getting any rpm because the motor is buried. What gearcase are you running?
    Living in the Freedom provided by Bud Conner and his fellow warriors.
    R.I.P. my Heathen Brother






  16. #15
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    right now and last run of season was with a Merc 1:87 Lower and something "similar" to a BOB's, my boat mechanic not sure who made it? and yes motor was buried for initial tests to check fuel pressure, water pressure etc. without scorching it, i can go up more on jack bolts, i might be able get a pic of where it is on jack now on Sunday, if warm in Wi. to show guys here, about how high on pad i ran? can you explain how to straight edge pad for hook? just simple straight edge back 4 feet from drain plug?
    I just uploaded a picture taken before we ran the slow 81 mph, i think if you enlarge you can see how low motor was bolted to jack, too bad you cant see pad, but jack is all the way up in this picture with lower unit not Bobs?
    Attached Thumbnails Attached Thumbnails bridgeport up.jpg  
    Last edited by Valero2.5; 03-04-2017 at 09:05 PM. Reason: add picture




    Previous Boats:

    77' Switzer Craft 72 mph 175 hp
    86' Lazer LTV 80 mph 200 hp
    90' HST Bridgeport 97 mph 250 hp
    86' Valero YT 80+ mph 200 hp
    79' Vector 80+ mph 200 hp 85' Valero V 83+ mph/ Current 200
    88 Valero YT not so fast, no good motor
    NOW 85' Valero Vee 2.4 Bridgeport Carbs

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