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Drop Snoot Advice

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BlackSheep

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« on: May 20, 2019, 12:27:00 PM »
OK, the pump is completely rebuilt, bearings packing wear ring "A" impeller, SS loader; The boat came with a Drop Snoot, (I think that's correct spelling) but you get the point. So the boat with the old motor which on the dyno makes 600+ hp and over 600 lb. ft. torque; Had a 4-degree wedge. So my new pump gas friendly motor on the dyno. 472.6 hp @ 5400 and 553.3 lb. ft. @ 4000 rpm.
When I lake tested the boat before the rebuild she did 75 mph @ 5200 rpm with the wedge installed worn A impeller GPS indicated.
So the question "Wedge" or No "Wedge." I know go test her. That takes time and money and a wasted day at the lake, therefore I'm open to suggestions. I have had many boats from V-Drive to IO, this is my first and definitely last pump boat, lol...
  • Boat #1: 1976 Rogers



08chevyguy

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« Reply #1 on: May 20, 2019, 02:28:11 PM »
Buy a few extra gaskets and try it  both ways. Which way was it wedged? My boat has a droop and is wedged downwards. I'm runnin low 90's but just had some pump work done and I think I'm gonna try flipping my wedge are so it is wedged up and see what that does 🤷‍♂️ and If it doesnt ride good then back in will just put it back to how it was. Gaskets are super cheap. And only a little bit of time to take the bolts out and flip it back or take completely out. I would just play with it and see which way you like it best

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bahner80

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« Reply #2 on: May 20, 2019, 06:10:32 PM »
Do you have a ride plate? If not and youíre trying to get the most mph out of her wedge it up so the boat rides dry. Be careful of the material on the bowl where the droop is bolted itís cast aluminum and can cross thread easily and be  a bad deal. I

BlackSheep

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« Reply #3 on: May 20, 2019, 10:33:02 PM »
Do you have a ride plate? If not and youíre trying to get the most mph out of her wedge it up so the boat rides dry. Be careful of the material on the bowl where the droop is bolted itís cast aluminum and can cross thread easily and be  a bad deal. I
Thanks, it's too late for saving the cast aluminum. Someone wallowed just about every hole then installed at different depths and angles "Heli Coil" treads. I'm amazed at what some call fixed. I'm thinking to remove the screwed up mess redrill the next size larger and get them the same depth and straight.
There is no ride plate, but there is a ratchet lever to adjust the nozzle.
« Last Edit: May 21, 2019, 08:50:21 PM by BlackSheep »
  • Boat #1: 1976 Rogers

BlackSheep

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« Reply #4 on: May 20, 2019, 10:43:26 PM »
Buy a few extra gaskets and try it  both ways. Which way was it wedged? My boat has a droop and is wedged downwards. I'm runnin low 90's but just had some pump work done and I think I'm gonna try flipping my wedge are so it is wedged up and see what that does 🤷‍♂️ and If it doesnt ride good then back in will just put it back to how it was. Gaskets are super cheap. And only a little bit of time to take the bolts out and flip it back or take completely out. I would just play with it and see which way you like it best

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Thanks
Mine is a 4 degree wedged up or thick side down. The best it would do last fall at 5200rpm was a GPS indicated 75 mph. Didn't matter if I moved the shift handle that controls the nozzle up or down; wouldn't go any faster. I don't remember if the nozzle was all the way up or all the way down; however, at the maximum nozzle travel, the boat got kinda squirrelly. Just don't remember which extreme it was...
  • Boat #1: 1976 Rogers

bahner80

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« Reply #5 on: May 21, 2019, 10:41:02 AM »
Without a ride plate  you might feel like youíre dragging the pump and boat will ride really flat. When the boat rides flat it doesnít load the pump properly. Forgot to ask if you have a loader or not. But that will help with keep the pump loaded. There are all different  types of loader depending on hp, hull type etc.....


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BlackSheep

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« Reply #6 on: May 21, 2019, 11:00:45 AM »
Without a ride plate  you might feel like youíre dragging the pump and boat will ride really flat. When the boat rides flat it doesnít load the pump properly. Forgot to ask if you have a loader or not. But that will help with keep the pump loaded. There are all different  types of loader depending on hp, hull type etc.....
It has an aftermarket loader, on CP Performance Marine's web site it's listed as a super-sport for mildly modified engines. When you refer to ride plate, is that the appendage that looks like it's attached under the transom and under/supporting the pump?
The boats that I have seen that attachment on are the higher HP faster boats. The part that's unclear and I understand trim from the foot/ratchet controlled cavitation plate on my Flat Bottom to the trim on the engine on an IO. To make speed on the boats I'm familiar with one needs to "Fly" the boat. (that's what we called it) So the Rogers has an aftermarket drop snoot lowering the water thrust below the hull. Then the 4 degree thick side down aims the angle of the snoot upward and that is the purpose. That would seem to have been able to be accomplished without the wedge because the aftermarket snoot has a ratchet controlled shifter similar to the one in my flattie. With four adjustments one can go through the range of angles from up from the center, to down. So what I'm gathering is I will need to experiment at the lake with different adjustments and find what best suites my hull/fuel load/weight of engine/occupants? Other words there is no generic setting just a starting point?
I appreciate your help, I have been into boating since the seventies, although they were flat bottom V-Drive or IO, and some hotter OB's.
I went pump this time because due to water shortages the lake has been to low over the years to safely use a boat with a prop. I figured since nothing is below the hull I could enjoy the local lake without the fear of grounding out, which has taken place more than once.
Thank You Again, All Help Is Appreciated...
« Last Edit: May 21, 2019, 11:21:12 AM by BlackSheep »
  • Boat #1: 1976 Rogers

bahner80

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« Reply #7 on: May 22, 2019, 08:21:17 AM »
Yes  the ride plate is like an extension of the pump intake that sticks past the transom ur on the rite track. On my boat I tried wedges, nozzle angle, etc.... to get it  ride a lol drier it took installing a ride plate to get the boat out the water a bit. Everything improved after that. Fuel consumption and mph.

BlackSheep

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« Reply #8 on: May 22, 2019, 08:12:38 PM »
Yes  the ride plate is like an extension of the pump intake that sticks past the transom ur on the rite track. On my boat I tried wedges, nozzle angle, etc.... to get it  ride a lol drier it took installing a ride plate to get the boat out the water a bit. Everything improved after that. Fuel consumption and mph.
Much appreciated, I don't mind chasing an outcome when one has enough knowledge to go in the right direction. Thank You...
  • Boat #1: 1976 Rogers


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