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Overpowering a 25' Revenge
scubadog	#1  Posted on 01/21/12 - 3:00 PM
Member Posts: 62 Comments: 0 Joined: 06/04/10	Looking to re-power my '87 25' revenge with a whale drive with used engines. Currently I have twin 200's '87. The max hp listed for the boat with the whale drive is 450 hp's. I am looking for used engines and have located yamaha 250's. If the weight of the engines are the same a 225 hp can I put the twin 250's on the boat? I know the overall HP will be 500, not the recommended 450. Thanks.
cmorekis	#2  Posted on 01/21/12 - 5:45 PM
Member Posts: 9 Comments: 0 Joined: 12/26/09	You didn't say if they are 2 or 4 stroke as there is a big weight difference. If this will help I have 2 Yamaha 225 hp 4stroke engines on my 1989 revenge w t with whaler drive which replaced 2 - 150 Johnsons. By getting rid of the 2 oil tanks and relocating the batterys up front under the ledge when entering the cabin it lightned the stern by at least 100 pds. if not more, so you should not have a problem with either one. I would at least move the batterys. As to hp rating I know the boat can handle it, but will the Coast Guard if you ever got checked. What can they do if anything,probably nothing, it's your boat Also it's just a rating they had to put on boats.I talked to the Whaler 9 years ago when I put on my Yamahas about the extra weight on stern and they said they didn't have motors that heavy then, so they could'nt advise me.I fish sometimes 30-45 miles offshore in the gulf off Destin, FL. and no problem holding up stern first in 5-6' seas so the extra weight is a non issure. Hope this helps
kamie	#3  Posted on 01/21/12 - 7:58 PM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	Sure you can, the coast guard doesn't care if you over power your boat just make sure the state and your insurance feel the same
fred s	#4  Posted on 01/22/12 - 7:26 AM
Member Posts: 119 Comments: 1 Joined: 03/04/11	I have 225 EFI's on my 1989 Revenge WT with a Whaler Drive. They replaced 200's that just gave out. That was a few years ago. I could tell very little, if any, deference in performance. The 200's did fine. I can run about 45mph with a clean hull but rarely run wide open. Way too costly and I am really never in that big of a hurry. Why would you want that much more horsepower and probably add more weight?
John Fyke	#5  Posted on 01/22/12 - 7:54 AM
Member Personal Page Posts: 1307 Comments: 0 Joined: 09/06/06	500 horses huh? If you have not exceeded the weight limit and you don't push those horses through the bow why not. John Fyke Re-Fit or Reef It 1979 15' Sport with Super Sport conversion and 70hp mercury.
fred s	#6  Posted on 01/22/12 - 8:41 AM
Member Posts: 119 Comments: 1 Joined: 03/04/11	John, Best reason I can think of is fuel consumption. I don't think he will notice a big difference in performance. Not sure but I wonder if Whaler decided that the max HP for that hull would be the best compromise for ride and economy?
John Fyke	#7  Posted on 01/22/12 - 8:50 AM
Member Personal Page Posts: 1307 Comments: 0 Joined: 09/06/06	That is his choice. He will have to decide that. John Fyke Re-Fit or Reef It 1979 15' Sport with Super Sport conversion and 70hp mercury.
fred s	#8  Posted on 01/22/12 - 9:04 AM
Member Posts: 119 Comments: 1 Joined: 03/04/11	John, I certainly agree with that but just offering some information that I gained from personal experience with the same boat that he has. Not trying to poo poo his thinking. Do you know how much weight he would be adding with the 250's?
John Fyke	#9  Posted on 01/22/12 - 2:45 PM
Member Personal Page Posts: 1307 Comments: 0 Joined: 09/06/06	I gotcha Fred. I'm not sure of the weight just going by what he posted. John Fyke Re-Fit or Reef It 1979 15' Sport with Super Sport conversion and 70hp mercury.
fred s	#10  Posted on 01/22/12 - 4:41 PM
Member Posts: 119 Comments: 1 Joined: 03/04/11	John, The weight will not be a factor in my opinion. I have 3 batteries and 4 Cannon down riggers at the stern. Probably sits a bit low, but never been a problem. I guess the Whaler Drive adds enough flotation to offset the extra weight.
Mattanza	#11  Posted on 01/22/12 - 6:05 PM
Member Personal Page Posts: 52 Comments: 0 Joined: 10/26/06	do you want to insure the boat? if so, and you go with 250's... replace the the decals.
duf	#12  Posted on 01/23/12 - 1:16 PM
Member Personal Page Photo Albums Posts: 840 Comments: 9 Joined: 04/22/07	naw, even easier, just draw a line through the 450 on the capacity plate, and pen 500 in next to it. Duf
kamie	#13  Posted on 01/23/12 - 2:39 PM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	Unless your rigging the engines yourself you might have trouble getting them installed. As long as the state doesn't care and you can get them rigged, there is no issue with insurance. if your insurance agent won't write the policy, mine will just PM me and i'll get you his info.
John Fyke	#14  Posted on 01/23/12 - 3:13 PM
Member Personal Page Posts: 1307 Comments: 0 Joined: 09/06/06	Nice one Duf.... John Fyke Re-Fit or Reef It 1979 15' Sport with Super Sport conversion and 70hp mercury.