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450rrrr
11-28-2010, 10:21 AM
just wondering why donzi put on such small tabs on this boat.mine are just 12x8.i have seen a factory pic with a k plane set up. do any of you have that set up.is it worth the extra $...i have a extra set of 12x12 sst dual ram bennett.that i was considering installing..or maybe pick up a set of thier 12x16 sst..hoping to make it a little more driveable around the 70 mph mark.we hit 73 on the gps..but it was all over the place.this thing likes to dance.and i dont think i can drive through it.so to speak..plus it seem to be the top of this motor packages range.love to learn a new boat.2nd trip out

FISHIN SUCKS
11-28-2010, 07:54 PM
I believe the K-planes are the optional trim tab. The little tabs do seem to be of little help on the ZX's, I would think the same for the ZR's. If you are going to do a swap on the tabs, I recommend the K-planes, never heard much of anything positive on the twin ram Bennetts. Good luck,
tom

The Hedgehog
11-28-2010, 08:39 PM
I did the K plane swap. Other than dealing with a list, the little bennets did not do much for me. Frankly I wish they had left the bennets off so I would not have had to have the glass repaired when I switched to planes.

fasttrucker
11-29-2010, 03:28 PM
I need K-PLANES too.Donzi should have used them from the start.

450rrrr
12-09-2010, 06:59 PM
i ended up get a set of 12x16 plates used off of ebay..and trim tab indicators from my local marine wholesale house.i figured for the 250 it cost me for both it would be worth a try.now if we could just get a little break in the weather

skipper
12-10-2010, 12:50 PM
Donzi is trying to keep the cost down when they set up my 27zr they did not follow Mercury's set up an put the smallest Kplane on the 525 then they couldn't control the boat once they put the larger Kplane on it settled right down. My boat is running 83 and I am still trying to prop it correctly

fasttrucker
12-10-2010, 01:23 PM
i ended up get a set of 12x16 plates used off of ebay..and trim tab indicators from my local marine wholesale house.i figured for the 250 it cost me for both it would be worth a try.now if we could just get a little break in the weather
Let us know how it works!Do these new plates work with the bennet pumps?

fasttrucker
12-10-2010, 01:26 PM
Donzi is trying to keep the cost down when they set up my 27zr they did not follow Mercury's set up an put the smallest Kplane on the 525 then they couldn't control the boat once they put the larger Kplane on it settled right down. My boat is running 83 and I am still trying to prop it correctly
The biggest mistake donzi made on the 27zr was to use the wrong trim tabs.Does your 27zr have the 525? I like to know more,welcome to the donzi net!

skipper
12-10-2010, 07:02 PM
Donzi put 150k planes on the boat and the 525 was to much power so we put 280's on it and it settled right down. If you want to check it out ...youtube....Donzi 27zr 525 running or Donzi 27zr 525 motor

450rrrr
12-10-2010, 11:44 PM
Let us know how it works!Do these new plates work with the bennet pumps?
they are bennett trim plates...st16 same size 12 in. base..but twice as long as stock.. the mounts are the same as stock

skipper
12-11-2010, 01:29 PM
not sure don't think they are the same as mercury Kplanes

fasttrucker
12-11-2010, 03:49 PM
they are bennett trim plates...st16 same size 12 in. base..but twice as long as stock.. the mounts are the same as stock
Let me know how they work!

skipper
12-11-2010, 04:30 PM
fasttrucker did you check out my pics

fasttrucker
12-14-2010, 01:59 PM
fasttrucker did you check out my pics
No,Were are they?.....I think you might have to upgrade your membership to be able to post them.

tomahdonzi
12-15-2010, 11:16 AM
Skipper,

I saw the vid's on You Tube. I had seen them before, as I was looking for 525 27ZR's. Very sharp boat. I have an '08 27ZR with the 496HO. Am thinking about swapping out for a 525. Sounds like the bigger K-Planes are pretty important with the 525. What gear ratio is your drive, and what prop are you using right now to get 83mph?

skipper
12-18-2010, 05:04 PM
50to1 plus you ill need an xr drive not sure of the drive ht. should be able to find out...that was also an issue

fasttrucker
12-18-2010, 05:46 PM
Yes,I think he will need to change the drive to a xr. A note on the drive height issue,I see that donzi made a couple of 27zr,s with the 496/375hp and it could not get up on plane,so they added spacers to lower the drive height.Thank god I didnt buy one of those..........

fasttrucker
02-13-2011, 03:25 PM
they are bennett trim plates...st16 same size 12 in. base..but twice as long as stock.. the mounts are the same as stock
I did a little research on these and found these st16 new on e-bay for $667 and $681 and $739. Those are for the complete kit and I just need the plates.

450rrrr
02-14-2011, 11:57 AM
I did a little research on these and found these st16 new on e-bay for $667 and $681 and $739. Those are for the complete kit and I just need the plates.
yes that is what i used st16....i had to replace the base plate on the boat..if you put in the indicators you will need to drill a extra hole under the ram..also if you need to pull the ram the top screw is a machine screw and it goes through the hull to the motor bay.. and the hull is so thick the standaed tub for bennetts is to short..they do use a pipe to compression union..they have replacements at home depot..i destroyed one so i replaced both...

Conquistador_del_mar
02-14-2011, 12:12 PM
I sold these to a member here, but you can see some pictures in the link. Bill

http://www.donzi.net/forums/showthread.php?t=62028

450rrrr
02-14-2011, 12:50 PM
http://img.photobucket.com/albums/v255/wowa450rrrr/P1010128.jpg

450rrrr
02-14-2011, 12:52 PM
http://img.photobucket.com/albums/v255/wowa450rrrr/P1010130.jpg

fasttrucker
02-16-2011, 02:41 PM
I got a price for the new st-16 plate,s/plane,s $171.44 each plus freight.

450rrrr
02-16-2011, 04:06 PM
I got a price for the new st-16 plate,s/plane,s $171.44 each plus freight.
did you check with bennett ...they have a scratch and dent .discount on returns . but you have to call them to see if they have any...you might check with them on that first...or just keep watching ebay

450rrrr
02-17-2011, 04:56 PM
I got a price for the new st-16 plate,s/plane,s $171.44 each plus freight.
http://cnj.craigslist.org/boa/2218040971.html
if you get a chance check out these..he did nt list the size..but for anouther 100 bucks you could have everything...lotts of spare parts..or you could sell of the rest and make your money back...
i think im going to buy a drive shower from him as well..he has several listed



on 2nd look they are way short..but might be good for some of these cllasics on here...either way its a good price

mphatc
02-17-2011, 07:15 PM
although my application is not a 27 Donzi, it is a 27' Magnum, twin small blocks. This boat had Bennett tabs, which I found grossly inadequate, and am replacing these with 30" long K planes . . everyone I have spoken to has advised that I run two K Plane pumps, 1 for each, for speed of action and because the extended length requires more hydraulic force than a small Bennet type pump can supply . . .

hope this helps

Mario L.

fasttrucker
02-18-2011, 03:55 PM
although my application is not a 27 Donzi, it is a 27' Magnum, twin small blocks. This boat had Bennett tabs, which I found grossly inadequate, and am replacing these with 30" long K planes . . everyone I have spoken to has advised that I run two K Plane pumps, 1 for each, for speed of action and because the extended length requires more hydraulic force than a small Bennet type pump can supply . . .
hope this helps
Mario L.
Iam trying to be as cheap as I can by just replacing the tabs/plates.Also those big k planes are really for boats that run over 80 mph. My 496h0 425hp pushed me best speed 73.5 gps......Iam not going to replace the motor like I did before.The new wave of big brother is to tax and spend but cut the national debt.I heard obama is trying to raise the gas and oil taxes. I plan on gas being around $4.00 a gal by summer.