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Thread: dynafly...!!

  1. #1
    quadzilla's Avatar
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    dynafly...!!

    Hey Guys..

    Two Quick question's about my 05 ski here....

    The ski is now fully back together..

    Fired it up tonight... Man it felt good to hear it running...

    I've had my head jammed inside that hull for about a month now..(obviously not working on it all this time.. )

    OK for now here's the rundown on whats on and in it

    IN THE HULL:.

    48 Hr motor.
    VF3's with the stuffers in.
    Fercho 3 degree key-way.
    Riva EFi controller (set at 3.3.1.6 till i get it in the water)
    Cut stock head, giving 143/143/138. (will check again now full exhaust is on)
    D-Plate (Riva version, opened out .1)
    Freeflow..(homemade from 1/8 inch thick stainless steel) = (overkill)
    Oil pump block-off.
    Riva Race filter.
    Jetworks Mod.
    BR9ES plugs J-Gaped and indexed.

    OUTSIDE THE HULL:.

    JIMS ff plate.
    R&D 800 grate matched to the shoe..(DAMN this was a lot of work.. )
    2002 Metal trim tabs. (machined on the trailing edge to 90 degree's)
    Pump-shoe set at .070 (not sealed yet)
    Riva extended steering nozzle.(have Riva auto drop in hand too)
    Air intake mod on right side cowl.
    Greenhulk.Net blue gas cap..(so worth 2-4mph alone)
    Syphon blocked off with jb weld.(sanded smooth)
    Visibility spout blocked of with jb weld.(ridge sanded off)
    85mm nozzle polished inside
    HO pump (cleaned up casting imperfections)
    Riva/jet-trim Black and gold seat cover.
    Pet 2100 tach.(can't seem to get it to pick up the rpm's on this ski..??) (I'll figure it out.?? )
    Garmin Geko 201 GPS

    I'm sure i'm forgetting something that's either in or on the hull...

    Still to do:.

    Install a pump tunnel reinforcement.. (that's why the shoe isn't sealed yet)
    Do the pump tunnel relief mod.. (have the 1/2" barbs in hand, But NO J/W Valves.. )
    Seal the pump shoe..
    Fill the holes..??

    THEN:.

    Take it out and get me some REVENGE..!!!

    NOW FOR THOSE QUESTIONS:.

    I have in hand a brand new 14/20 dynafly impeller.. actually a 13/20 according to my new Tommy Gauge(2fast4u)..??

    I also have in hand a very low hrs dynafly 14/24 setback..

    The first question.. what do you feel will happen if i leave the dynafly as a 13/20..???
    I've a feeling that due to the 800 grate and the jetworks mod it'll cavitate quite extreme..??

    The second question is what speed do WE think this ski will achieve with this setup..

    OK a third question what about the 14/24 what will i see with that..??

    I have a Riva 1200 grate in hand also..(don't want to use this till i do the tunnel reinforcement)

    Sorry about the long post guys..

    Gerry


  2. #2
    philip_gpr's Avatar
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    13/20 - rpms will be high, anything with a 800 grate cavitates

    14/24 - SB 1+ mph faster, SB good pitch for your set-up

    77 ish - when dialed in

  3. #3
    cheatin' piston popper addicted's Avatar
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    Gerry, if you don't want either one , I think we may have a trade brewing

  4. #4
    Duke's Avatar
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    14-20 = nice holeshot with decent topend. 73 to 74ish

    14-24 = good topend but no midrange 75 to 76ish

    14-22 would be my choice for your setup.

    Pitched prop performance also depends on who and how it was pitched and how much surface is actually 24 degrees.

    Both are going to cavitate horribly with 800 grate.

    Thats how I see it at least.

  5. #5
    philip_gpr's Avatar
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    Duke is probably right, your rpm with the 14/24 will probably be too low, you can get more peak rpm with the 14/24 if:

    if you can get 93 or 94 octane fuel you might raise the compression some more

    you might also put the sound suppression back in

    you might also try a 87 mm nozzle
    Last edited by philip_gpr; 03-06-2008 at 10:59 PM.

  6. #6
    Gatorcountry's Avatar
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    Quote Originally Posted by Duke View Post
    Both are going to cavitate horribly with 800 grate.
    +1

    I just switched my 800 grate for a 1200. Cavitation was terrible. The first time I experienced it, I thought the impeller had stripped out and the shaft was just spinning.

  7. #7
    quadzilla's Avatar
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    ?

    Cool...

    Went for a beer.. came back to plenty replies..

    The 14/24 was done by JIM'S It's one of his personal props..(or it was its mine now..)

    Mike i like the sound of that.. (one will definately be for the off)

    As i posted i'm not keen on using the 1200 grate till the tunnel is done

    Can't really get any more compression out of it, as i'm already at the squish band..
    Even through i started with 125 or better across all three..(i'm using an 03-04 head..??)
    (as per this thread..http://www.greenhulk.net/forums/showthread.php?t=50645)

    So for now it'll be all about throttle control..

    I can get 100 octane fuel here no problem..(well apart from the price call it $10 a gallon out the gas station)

    I think i'll be getting my 85 nozzle bored to 87mm.. from the results Ross posted on one he did last year.. it's a win-win situation..

    Thanks for the replies gentlemen..
    Last edited by quadzilla; 03-06-2008 at 11:20 PM. Reason: more

  8. #8
    KamikazeGPR's Avatar
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    I know you plan on changing it, but 3,3,1,6 is pretty lean for a cut head and vf3's. be careful.

  9. #9
    Duke's Avatar
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    Quote Originally Posted by KamikazeGPR View Post
    I know you plan on changing it, but 3,3,1,6 is pretty lean for a cut head and vf3's. be careful.

    Completely missed that!! Way to lean there! #3 pot should be at least 3 or 4.

  10. #10
    philip_gpr's Avatar
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    what is you squish?

    87 mm nozzles are cheap to buy, so I wouldn't bore out the 85

    many people have reported the 85 being 1 mph faster

    others have seen the same speed for both nozzles, with the 87 having higher rpms

    my suggestion is to test both on your ski and then chose the best option

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