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 Post subject: Re: 2520 Sport Cabin mod-V repower
PostPosted: Wed Jun 13, 2012 6:53 pm 
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Congratulations on getting your numbers.
I also agree that these boats seem to have a 'terminal velocity' where more power does not always translate into more speed.

We had two identical 21SE rescue boats at work.
One wore a 225 Merc, the other a 150 Yam.
At WOT, the 225 boat only bested the 150 powered boat by about 3 knots.

Congratulations too to Savannah on her first fish.
Something tells me from that smile that she is hooked. 8)

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 Post subject: Re: 2520 Sport Cabin mod-V repower
PostPosted: Sun Aug 26, 2012 9:41 pm 
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Posts: 15
Coming up next week for tuna on my cousins Parker. Any advice? Probably go to Stellwagon but not sure. He just got his back from the shop, wiring harness got chaffed and killed the ignition 225 YAMAHA . long tow back. Good luck with the new motor. awesome sight


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 Post subject: Re: 2520 Sport Cabin mod-V repower
PostPosted: Sun Aug 26, 2012 10:05 pm 
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Location: Boston
The Best ! :D
Have fun with the new crew and the motor :wink:

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 Post subject: Re: 2520 Sport Cabin mod-V repower
PostPosted: Mon Sep 03, 2012 8:28 am 
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Location: Pensacola, Fl.
Dale..... Did you see any attitude change how the boat sits in the water at rest? The bracket tubs that they use are small. Aprox 18in wide.

More flotation could be had with a wider tub. But these are wider boats and can support more weight.

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 Post subject: Re: 2520 Sport Cabin mod-V repower
PostPosted: Mon Sep 03, 2012 10:50 am 
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warthog5 wrote:
Dale..... Did you see any attitude change how the boat sits in the water at rest? The bracket tubs that they use are small. Aprox 18in wide.

Nope, I observed ZERO change in hull attitude at rest :D !

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 Post subject: Re: 2520 Sport Cabin mod-V repower
PostPosted: Tue Jan 22, 2013 6:10 pm 
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Dale....You need to update this thread.

Close up pix's of which holes the motor is bolted in.

I did see you had the Johnny/Rude jacked all the way up. I had asked Kev about his motor height and he had it all the way down.

I have one more hole I can go UP. But now this boat of mine needs a prop change. It's overall average is 1.6MPG....and that just SUCKS! Oh and Plus oil. :( Furthermore I'm spoiled with have 4 stroke injected motors. This thing has Carbs. It was a Little finicky in the parade with all the idling, but it also had 2 fuel pumps take a dump the day before. We had all 3 pumps replaced, but I believe it didn't do the plugs any good. I just replaced the plugs again today.

When the Mako's are gone a DF-300AP is going on it.

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 Post subject: Re: 2520 Sport Cabin mod-V repower
PostPosted: Sat Mar 09, 2013 3:30 pm 
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Location: Pensacola, Fl.
Ok....Were doing more testing here in Fl. :)

Wind was @ 15MPH out of the South East. Bay was all blown up with Whitecaps 1.5sec apart. IE: It was Snotty out there.

We started inside in the Bayou and this is where the pix's are from today.

Ken @ PropGods sent me a Merc Enertia 3 X 15 X 15

Image

Image

With the motor raised and still in the 3rd Hole.

Image

Here is where she is.

Image

This is our burn & MPH

Image

Here is the Max RPM

Image


Then we went outside the bayou into the snot.

The boat would come out of the hole much better. It would hit 5200 and then drop back to 5000 as the motor seemed to take on more load.

The prop has been the best so far and has actually made a beliver out of me that this motor is capable. But I'm not finished yet. :D

I'm raising the motor all the way up. Look at the pix with the cavitation plate under water. You want it right on top. With talking to Ken today he agreed and thru in there also that by raising the motor another hole it would take more advantage out of the motor as to pointing the Bow toward the sky. Should be good for a extra 200 to 300RPM.

Plus It's Free to do. :)

We talked about going to a 14in pitch. It changes the dia. also. But he thought that all we would get is a slightly better throttle response. Something I want, but not will to sacrifice anything else.
[898988A46 Enertia dia.15.2 pitch 14 RH]


It's getting better. :)

Cruising:

3 X 14 X 17 4400RPM - 24.4MPH = 1.8MPG

3 X 15 X 16 4400RPM - 25MPH = 1.8MPG

3 X 15 X 15 Enertia 4400RPM - 29MPH = 1.9MPG

Who would have thought the last 2 props being that close together would be that far apart on performance.

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 Post subject: Re: 2520 Sport Cabin mod-V repower
PostPosted: Sun Mar 10, 2013 5:59 pm 
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I find prop testing to be a unique that EACH boat and prop exercise, even down to aleged same spec props from different makers.

Glad you're going to raise it, from looking at the pic I thought the same thing ...

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 Post subject: Re: 2520 Sport Cabin mod-V repower
PostPosted: Mon Mar 11, 2013 7:10 am 
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Watching this thread closely...

I've known for a long time that my motor is too deep, but being wet slipped without a trailer, making adjustments is difficult. :)
Since the boat is in the BOE lot for the winter, my plan was to have Jim raise the motor before spring commissioning.
Thing is, I have to get it right (or at least better) the first time because once she is splashed, I'd need to be hauled to make adjustments.

My plan was to go with what worked for Bobby by using his photo, while also understanding we are talking about 2 different boats... 2530 vs 2520.
When I was 'prop shopping' a few years ago, I spoke at length to my local prop shop owner who runs an older 2520 like mine.
He believed that a 3x16x16 would be ideal, but nobody made one at the time, so I went with a Merc Mirage 17p with a little cup added.

It has been a good prop topping out at a best of 34kts loaded (with 4 adults) on flat water with a clean 'spring bottom'.
My hope is to do a little better than that and getting a little better economy by raising the motor 2 holes.
Here is the photo of Bobby's motor that I'm going to go by, and a shot of my present prop. Fingers crossed!


Attachments:
Outboard motor position.JPG
Outboard motor position.JPG [ 143.41 KiB | Viewed 271 times ]
Prop01.jpg
Prop01.jpg [ 453.65 KiB | Viewed 271 times ]
Prop02.jpg
Prop02.jpg [ 468.03 KiB | Viewed 271 times ]

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 Post subject: Re: 2520 Sport Cabin mod-V repower
PostPosted: Sat Apr 15, 2017 6:45 am 
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Joined: Mon Jun 19, 2006 9:13 am
Posts: 21
I am thinking about repowering my 2510 from a F225 to a F300. Could you give me the name of the person you used for your repower and are you happy with the job. Thanks


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