Thread: Bow lift comparison
10-23-2009, 09:39 AM #1
Bow lift comparison
The pic on the left is with my ride plate shimmed down in the front, the one on the right is with the plate mounted level (no shims). That is two mph right there.
10-23-2009, 09:45 AM #2
10-23-2009, 01:10 PM #3
Is the same intake grate being used in both pictures? Tabs or not? I can't remember your complete setup. The reason I ask about the intake grate, is because some of the more aggressive intake grates want to overstuff the pump and actually try to pull the bow of the boat down, contributing to porpoising and sometimes a high speed "buck". A less aggressive intake grate might help you raise the bow a little more?
10-23-2009, 01:30 PM #4
Yes the same intake grate is being used, an R&D grate and plate with the Group K cut, and Riva Aluminum Tabs.
10-23-2009, 01:44 PM #5
In the pics you will see where I added some gray putty to front of the ride plate to help close the gap between the hull and plate. With the plate shimmed down so much in the front the gap got bigger. At top speed my ski would sometimes without warning would drop down in the rear without unhooking, and raise back up and the bow would of course come down. This would happen quickly and it would line itself out just a quick as it happened. It never would settle into a porpoise though. I added the white putty to fill in the gap between the rear corners of the intake grate and the front of the ride plate and it actually lined everything out and the top speed handling issue went away.
10-23-2009, 02:07 PM #6
Im with Brandon on this one,get the nose up in the air.
Get it dialed in then seal up the gaps and holes
10-23-2009, 02:15 PM #7
It's been my opinion that the R&D grate has an aggressive blade (scoop) to help top-load the pump. This is great for rough water riding, but "can" lead to overstuffing the pump tunnel. If the pump isn't processing the water through the stator veins it creates other issues. In talking to some of the guys @ R&D back in the day. That grate was designed for c/c racing and rough water riding. I believe that if you use a jetdynamics pump shoe and a less aggressive scoop grate you can pick up some speed. I think, what was happening to you and your GP was some slight overstuffing of the pump. As things wear out in the pump and clearances open up some of the overstuffed water is relieved around the outside of the impeller and released through the stator section. I will be testing some of this next summer on my son's boat (The Silver Ghost, with a Dan Lamey p/v 927 and twin pipes). I would have done the testing this summer, but never got any of my 'runners in the water, only customers and friends. Just my thoughts, but it might help.
10-23-2009, 02:18 PM #8
I ran 66 mph unsealed with a single pipe this year I lost my GPS so I dont know what it ran with pipes on it but I gained 450-500 rpm so I know it was hauling ass
The GP will still turn realy good with the nose up too.
10-23-2009, 02:20 PM #9
I thought it was over stuffing also, but then I realized it would sometimes do the same thing at 45mph. I am sure there is a faster grate out there but I am happy with the overall performance. With the putty in the bolt holes and the 3M 5200 sealing everything, my grate is practically welded in place, so I won't be trying anything different.
10-23-2009, 02:32 PM #10
As far as stuffing goes I was stuffing the pump at 60+ mph on the 97 with a stock intake grate and plate
I was also starting to stuff but bucking instead on the 99 with stock intake grate and a R&D ride plate.
Puting the R&D intake grate in instead fixed the problem.
I did have an even better intake grate but its busted right now and needs fixed.
I ran it on a triple piped ski in the past and it improved handling hook up and top end
This intake grate was amazing I will get it fixed some day.
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