Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: 1994 21 outrage re power suggestions
Posted by giganticair on 05/21/16 - 5:31 PM
#1
Currently this awesome boat is powered with some very tired 130 yamahas. These motors don't owe me a penny. In fact with over 3000hrs I'm about to owe them . It's time to repower! I want to go with 4 strokes but weight is an issue. She's rated for 300hp but twin 150s is just to heavy. A pair of 115s will be close to the same weight and hp since the old yamahas hp was rated at the head. I can also drop a lot of weight and go with a single 250 or 300. I would drop 170 lbs and gain big speed but sacrifice redundancy and maneuverability. Anyone ever repower with a single over twins and regret it? Any suggestions. Thanks
Posted by mtown on 05/21/16 - 5:55 PM
#2
My longer reply would not post for some reason. Quick answer is single. Would not rule out Suzuki but like Yamaha too.
Posted by Joe Kriz on 05/21/16 - 6:00 PM
#3
You aren't giving us any weights here.
What weights are you looking to achieve?
Posted by giganticair on 05/21/16 - 7:20 PM
#4
Weight is an issue. My twin 130s weigh about 379lbs a piece. A new 250 or 300 Yamaha with a 30" shaft around 560. Right now with a full lad of gas (119 gallons) the water line is right at the top of the transome scuppers. Put two people fishing in the back the bilge will constantly run. It's been like this for years. I know the boat is holding water and I can re power with similar weight 4 strokes like the 115s or suzukis . I really just want feedback from anyone who has or know someone who,has gone from twins to a single and what their thoughts are. So many pros and cons.
Posted by JRP on 05/22/16 - 3:45 AM
#5
You could end up saving a noticeable amount of weight even if you stick with twin 4-strokes. Mercury has 115 Fourstrokes that weigh 359 lbs in the 20" shaft version. Assuming your current twins are 20" shafts, that would be 40 lbs right there, plus the weight savings from removing the 2-stroke oil tanks and oil (another 30-40 lbs ??) And all of that taken off the transom where it has the most effect.
The Merc 115 ProXS Fourstroke is the top performing version of their 115 Fourstroke family. Supposedly it is generating over 125 HP. The engines are 2.1L, so two of them puts some serious displacement on your transom -- 4.2L! That should get you performance comparable to what you're used to with the Yamahas.
Posted by bradsc on 05/22/16 - 5:14 AM
#6
I can not answer your questions, but here is my 2 cents: I had a 21 Outrage and regret the day I sold it. I did not have experience with twins. Mine had a single 225. We would fish 60 miles offshore but always had a buddy boat or 2. I often wished I would had put twins on it. Got around 3MPG so had over 300 mile range.
So, Twins vs. single, I would think that would be answered by what type of boating/fishing do you do?
A lot offshore, redundancy and safety, twin 115 Yamahas and deal with the scuppers. Where is the water coming from? My scuppers at the transom were just a black rubber flap. Could you change out the back flow system?
No/little offshore, Single Yamaha 250.
Wish I could give you some weights and how low that made the boat sit in the water. Hopefully someone else can provide that info.
Good luck and great boat!
Posted by Acseatsri on 05/22/16 - 6:35 AM
#7
When I repowered my 1993 23 Walkaround , I went from old 150 2-smokes to a single Honda 250, going from around 800 pounds on the transom to 635 pounds. Also moved the 2 batteries from the transom , going to 3 batteries to the storage area under the helm station, moving them forward about 6 feet.
This week, went fishing with 4 men and 150 gallons of fuel on board, a total weight of about 6800 pounds , and managed 2.8-3.1 mpg running 17-30 mph. As a benchmark, my friends 21 Parker with brand new f200 Yamaha (4 cylinder) gets a best 2.75 mpg with 100 gallons of fuel and 2 people aboard.
Other boat test reports with the Honda 250 show around 30% better fuel mileage than other manufacturers engines on identical hulls, so I would at least give the Honda a look. It's also quieter than the New Yamaha 250 and 1st generation Etec 250, as I've been on boats at my marina with all of these engines.
Posted by Marko888 on 05/22/16 - 9:54 PM
#8
Four stroke twins: DF140A's would weigh about 815 pounds dry and give 4.2L of displacement. I have one on my Outrage 18.
It is less of a powerhouse than the 150's, but will be close to your weight target and will provide more speed than any of the 115's.
Use the search function to find my reports on performance. Fuel economy is exceptional.