reason for vblocked loader in small tunnels?
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reason for vblocked loader in small tunnels?

  1. #1
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Default reason for vblocked loader in small tunnels?

    Whats a reason to run a fully vblocked loader other than transom lift? Any reason a boat wld slow on mph with it removed? My loader is killin me at the holeshot and its gta go but its accelerates so nice on keel im half scared to remove it and cause a overcharge issue that tosses me.boat shutsdown nice over a 100 with no ratchet or popoff as well and never tries to turn on me even in bad shutdown water and being super lite.boat had a bbf in it prior to me gtn the boat so my thot is they needed transom lift and sacrificed some holeshot for it.any thots????my deal is much much lighter than a bbf.doesnt need any transom lift.run the boat with 2* plate 6* nozzle fixed.

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    southwindsforsure justsquirtin's Avatar
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    I had one on my placecraft and same issue great for rolling starts terrible hole shot replace with a ss loader no problems with shutdown at 100

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    Senior Member TNYoungblood's Avatar
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    I ran both blocked and open at the last race and the blocker killed the holeshot. I didn't really see much difference on the time slip either. I'll look at my notes and see what it done.
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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Good info guys, blocker is coming outta loader.had to be there for ass lift with that bbf in it.mike no ill effect to mph either way? I like the loader cuz it works so well, will give it a try with the blocker outta it and hope i didnt screw up.

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    Senior Member ontheNOS's Avatar
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    Just cut a couple inches out of the V-blocker and try it that way.
    Last edited by ontheNOS; 09-03-2013 at 06:58 AM.

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    Senior Member TNYoungblood's Avatar
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    [QUOTE=IMPATIENT 1;2537065]Good info guys, blocker is coming outta loader.had to be there for ass lift with that bbf in it.mike no ill effect to mph either way? I like the loader cuz it works so well, will give it a try with the blocker outta it and hope i didnt screw up.[/QUOTE




    Tom lookin at my notes with the open loader the boat ran 10.298 @ 99.38 mph .. I wanted to try my blocker loader so on the very next pass the boat ran a 10.292 @ 102.5 mph .. No other changes were made but the DA went from 1852 to 2236 .. It did give the boat some lift, I guess that is where the mph gain came from ..

    The white loader came with the boat and the open loader is one that Chris at B1 made for me .. The holeshot is night and day difference!!!!!



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    "Need For Speed" Gearhead's Avatar
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    TN... first, that is a minimal block!

    As per OP's question,the block in a loader is primarily used to lift the tail of the boat. Back in the "old days" we left a holding rope a couple of hundred feet from the starting line and approached the line at probably 30 miles per hour. Any way you look at it we had a running start at the line. I ran most successfully with a Semi block loader on my old 18' Youngblood. A buddy of mine ran best with a full block on his Mantra.

    Those were the days before the short rope and inducers. The amount of water required in a pump inlet to accelerate the boat will ultimately depend on the hull style, bottom style, style of racing and amount of power. Generally as a boat has more power and is quicker, it demands more water in into the pump to process thrust at the nozzle. So, to simplify slightly, the more power you add and the quicker the boat then the more more water in you need with no obstructiuons. And in these situations, we generally run much quicker with a more open loader. Again it is going to depend on your craft and power level. But the quicker you can get one to leave from a dead stop by minimizing the pump cavitation and developing bowl pressure quickly then the potential for running quicker and faster exist.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Thanx mike, doesnt look like it hurt your et any goin full open.ive gta nuff info on what mine mph at with the blocker so ill report back any mph loss.if it leaves much better without it and still does 105 or better ill leave it out if i need any more transom lift ill jus wedge for it.take out a degree or two, thatd help it leave better as well.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Gearhead View Post
    TN... first, that is a minimal block!

    As per OP's question,the block in a loader is primarily used to lift the tail of the boat. Back in the "old days" we left a holding rope a couple of hundred feet from the starting line and approached the line at probably 30 miles per hour. Any way you look at it we had a running start at the line. I ran most successfully with a Semi block loader on my old 18' Youngblood. A buddy of mine ran best with a full block on his Mantra.

    Those were the days before the short rope and inducers. The amount of water required in a pump inlet to accelerate the boat will ultimately depend on the hull style, bottom style, style of racing and amount of power. Generally as a boat has more power and is quicker, it demands more water in into the pump to process thrust at the nozzle. So, to simplify slightly, the more power you add and the quicker the boat then the more more water in you need with no obstructiuons. And in these situations, we generally run much quicker with a more open loader. Again it is going to depend on your craft and power level. But the quicker you can get one to leave from a dead stop by minimizing the pump cavitation and developing bowl pressure quickly then the potential for running quicker and faster exist.
    Good infl thanx steven.i prob need a inducer as well but tryin to do it without one.gna try open loader and bring the bowl in a tad more see how it does.hey if ya got barry's cell can ya pm it to me? Wanna talk more bout cp setup with him.

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    Senior Member TNYoungblood's Avatar
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    Quote Originally Posted by Gearhead View Post
    TN... first, that is a minimal block!

    As per OP's question,the block in a loader is primarily used to lift the tail of the boat. Back in the "old days" we left a holding rope a couple of hundred feet from the starting line and approached the line at probably 30 miles per hour. Any way you look at it we had a running start at the line. I ran most successfully with a Semi block loader on my old 18' Youngblood. A buddy of mine ran best with a full block on his Mantra.

    Those were the days before the short rope and inducers. The amount of water required in a pump inlet to accelerate the boat will ultimately depend on the hull style, bottom style, style of racing and amount of power. Generally as a boat has more power and is quicker, it demands more water in into the pump to process thrust at the nozzle. So, to simplify slightly, the more power you add and the quicker the boat then the more more water in you need with no obstructiuons. And in these situations, we generally run much quicker with a more open loader. Again it is going to depend on your craft and power level. But the quicker you can get one to leave from a dead stop by minimizing the pump cavitation and developing bowl pressure quickly then the potential for running quicker and faster exist.


    Its been trimmed several times .. When I got it with the boat it looked like somebody was cuttin on it and just quit half way through it so I had to clean it up .. It still made a big difference on hole shot vs the new loader ..
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    Senior Member bp298's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    Thanx mike, doesnt look like it hurt your et any goin full open.ive gta nuff info on what mine mph at with the blocker so ill report back any mph loss.if it leaves much better without it and still does 105 or better ill leave it out if i need any more transom lift ill jus wedge for it.take out a degree or two, thatd help it leave better as well.
    while a block may or may not add lift (depending how it's angled with respect to keel), it's purpose is to help reduce the area of the opening as speeds get higher. there have been loaders built with "adjustable" blocks, in that a person can change the block to different lengths for testing purposes. once the desired length is identified, a loader with a fixed block can be made.
    the more important attributes for the loader are the position of the ramps with respect to the suction piece roof, length of the ramps, position of the ramps forward, and depth of the ramps from the intake roof. what's really more important is the shape of the keel to intake transition, how well the bottom actually loads the pump. if the transition is very good providing excellent negative keel pressure, very little is needed in the way of an aggressive loader. ramps can be short, well up in the hole and still be very effective at directing the flow path. another factor is the shape and type of intake that's in the boat. all these little things, as well as others, affect flow path from the keel to the impeller. all of it impacts acceleration from a dead stop. and if it impacts acceleration from a dead stop, it impacts acceleration from 15mph.

    the very first time I ever took the sw to the track, it was nothing more than a lake boat with a somewhat tired 454. we went because we didn't have anything else to do that weekend, and it would be fun to get some test laps. entered the test and tune class at ming. took the back seat out of it, installed a rope deflector and kill switch, and off we went. I had very little hardware for the thing to try. no removable nozzle inserts.
    I had been using a "speed grate". some people wont' know what that is. basically a rock grate with a couple pieces of short 1" angle welded to it. first pass, I ran 13.40 at 72.6. one time down the track and I was hooked. it was awesome. jack came over with a loader, said "try this". so in it went. that loader was a v-blocker, with about a 6" block. ran 13.18 at 75, no other changes.
    someone else suggested another v-blocker that had "worked great" in another swtd. the thing was huge, ramps were a mile long. I didn't want to put it in, but keith says "yeah try it", so we did. slowed back down to 13.45 at 71. I could feel the thing, and couldn't get it out of there fast enough.
    last pass of the weekend was 13.04 at 77mph, and the only effective change we really made all weekend was that loader. at the end, we made a flat block loader with the same ramp dimensions. except for 2 or 3 races, I ran that loader in the sw for 11 years. that was a heavy boat, but it always got traction to max rpm off the rope and accelerated out like it was supposed to, bowl pressure rising.

    without seeing it, i'd guess that you can make an improvement with a better loader. not just by hackin up the one you have, but a better loader to start with. but a loader by itself is just one part. you should understand, there are guys today that are putting way more hp into the pump at the hit, from a dead stop, then you are. in heavier boats less conducive to hard launches, and they are getting immediate traction and launching like you would not believe. there are most likely a number of things that can be improved to really get that boat to perform to it's full capabilities.

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    DJD
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    I run allot of blocker in mine and have zero problem with holeshot. I use the blocker to remove intake pressure.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Yeah gtn rid of blocker completely worked picked up from 105 to 106.4 at the same 18lbs.holeshot is completely different it can take full boost now woohoo will have to remove nozzle and rideplate angle a bit cuz at the hit as boost climbs it tries to pop outta the water alil too hard.shutdown from 106 no thing nada change there.having a 16inch vblocker is like havin a slipping clutch lol feels that different now im happy happy happy

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    Senior Member wizard612's Avatar
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    This is where I get to come in and tell an old geezer story... I ran a V-blocker in my Daytona back in 1977-78 (I think I still have it hiding in the garage). I was running it in APBA and NJBA Ski-Jet II Circle Racing. Class was 460CI max single 750 carb, "wet exhaust", two seats, no adjustable trim. We just didn't make enough HP to get the boat dry enough. Jeff Bennett (my crew chief) needed to free the boat up. We tried bolt on strakes, longer drive shafts, shorter drive shafts, all sorts of stuff. The V-blocker gave us the best lift without the loss off handling. The strakes really lifted the boat but in circle boat water it was just too swirly for me. If I had more HP the blocker would have hurt loading but in my case with less power it proved to be a winner.
    PS: my boat ran 96 in the Kilos a bit slower on a track with up to twelve other boats. I have no 1/4 mile time since we only ran it in 5 mile circle heats.

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