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Author Topic:   Repowering 21' Outrage single or twin?
72outrage posted 07-23-2003 09:48 AM ET (US)   Profile for 72outrage   Send Email to 72outrage  
Hey, I am currently in the market for some new power on my 1972 Outrage. I'm not sure if I sould get One large (200+) motor or twin ( 100+'s)

* Do twim motors burn twice as much gas?? Are they working half as hard as a single motor? Can I run just one motor at a time for normal operation?

* What is the translation difference from a 1972 200 horse power motor, to a 200 horse power motor today? Size, Weight, and torque/pressure applied to the transom.


"This boat is built to accomodate under normal conditions a outboard motor single or dual not more than 200 OBC certified horse power, and 12 persons..."

* Now what exactly does that mean in today's motors on the back of my 72, 21'?

* What is a Whaler drive??

Thanks for any help...

captbone posted 07-23-2003 10:21 AM ET (US)     Profile for captbone  Send Email to captbone     
Get a single 200 hpdi Yamaha, it will make the boat fly and will give you 3+mpg and no trouble.
andygere posted 07-23-2003 03:53 PM ET (US)     Profile for andygere  Send Email to andygere     
See: for more analysis and conjecture on this topic. Good stuff here.
whalerdude posted 07-23-2003 06:20 PM ET (US)     Profile for whalerdude  Send Email to whalerdude     
I have a 22 OR with twin yamaha 130s with counter rotating engines.

I do not like the higher weight of the twins. However, I will put up with that due to the tremendous advantages I am experiencing with the twin engines.

It is easier to drive with the counter rotating engines due to no torque steer.

Quicker holeshot. Less cavitation in turns. More confidence taking my kids out on the water. I can plane on one engine. I am getting about 3 mpg overall. I used to get 5 with my single 150 v6 on my Outrage 19.

I can hit 50mph top speed. I think the engines work less too, just my opinion.


jimh posted 07-23-2003 08:45 PM ET (US)     Profile for jimh  Send Email to jimh     
For information about the Whaler Drive please read the article I wrote in the Reference Section that provides detailed information about this topic. For you convenience a hyper link is provided below:

72outrage posted 07-24-2003 08:10 PM ET (US)     Profile for 72outrage  Send Email to 72outrage     

How much weight can the transom of my boat hold???
Would a 225 EFI Saltwater Fourstroke be to much?? The next size down is a 115 EFI Saltwater Fourstroke, which I don't think is enough power!
Clark Roberts posted 07-25-2003 06:43 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
72, here is some info you may find interesting and hopefully helpful: Currently I am running a 115 Merc EFI four stroker on my 1979 Revenge 21 (same hull has your Outrage and maybe 200 lbs heavier) and get 38mph top speed per GPS and 5.5mpg at 25mph cruise @ 4200 rpm turning a 15" pitch SS Stilletto. In the past, on same boat, I have run a 200 carb Merc (52mph @ 5800rpm... mileage???); a 90 three cyl Merc (36-37mph and 3mpg @25mph cruise) and a 135 Merc Optimax (45mph @5600rpm and 5.5mpg at 28-30mph cruise). BTW the Whaler data states that min. power to plane and operate satisfactorily is 65hp (yes 65! and that was when engines were crank rated vs. todays prop rating so 65 at crank would be mean less at prop). I wouldn't recommend less than 90 prop rated hp, however, based on my experience. As to single vs. twin I would recommend single because of the extra weight and $ of duals and because I'm biased due to the "fiddle factor" (two trims, two throttles, trying to sync the engines continuously is a bother to me... always fiddling with controls and when things are all synced and humming just right I have to slow down and fiddle all over again... etc,,etc,,). Have fun, repowering can be a real opportunity! Happy Whalin... Clark... Spruce Creek Navy
PS> Currently am restoring a 1977 Outrage 21 (great shape) and have a 1997 Mariner 150 EFI Magnum waiting in the wings. Should be a great combo... just need time to get to it as I still have to finish a 19' Lo Pro conversion.
72outrage posted 07-31-2003 10:54 AM ET (US)     Profile for 72outrage  Send Email to 72outrage     

Thanks for the info guy's, CL how many different motors have you put on your boat? Where they different hulls? Well, I just don't know what I going to do.. $$ Is an issue, but just because it cost alot doesn't mean I won't get it. It just means I might have to wait a little longer... My friend (mechanic) is steering my toward the old Carbs, or a fourstroke, and away from the Optimax, I dont' want a carb, I could live with a fourstroke if I had the right power! The 225 EFI 4 is just to much weight. I don't think the 115 4, is going to make me happy... I know Yamaha is coming out with a 150 fourstroke in Sept! I don't know if I could live with a Yamaha either! Good motor, but.... I wish Mercury had a four stroke in the 150-175 range. Does anyone know of Mercury coming out with any new fourstrokes?

Bigshot posted 07-31-2003 11:53 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Uh.....Mercury and Yamaha 4 strokes are the same except for certain models. The 115 and 225 are identical. Suzuki has a 140 and yamahas 150 is still a 4cyl so I doubt much more performance over the Zuki.
Bigshot posted 07-31-2003 11:55 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
PS...the Optimax/Ficht/HPDI are not much lighter than the 4 stroke v6's. Matter of fact that new Yamaha 4cyl 150 will weigh more than a V6 carbed engine(480lbs?)
Jamie 20 outrage posted 07-31-2003 10:44 PM ET (US)     Profile for Jamie 20 outrage  Send Email to Jamie 20 outrage     
Mercury is soon to come out with a 225/250 straight six supercharged 4 stroke outboard. The engine is in its final testing. They say it will be the same weight as the optimax. The last thing I know is that will not have control cables, fly by wire........I really don't like the words new and improved.
Sal DiMercurio posted 08-01-2003 12:13 AM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
I don't know.
I see some numbers here that are really questionable.
One guy had a single "V" 6 - 150 hp [ had to be carbed ] on a 19 outrage & got 5 mpg...............I really, really have serious doubts about even 3 mpg.
Another runs a 115 hp on a 22 & gets 38 mph, yet only gets 25 mph at 4,200 rpms with a 15p prop...............somethings not adding up here because that engine would need very close to 6,200 rpms to reach 38 mph with a 15p.
72outrage posted 08-01-2003 12:32 AM ET (US)     Profile for 72outrage  Send Email to 72outrage     

Well, I went to the local Merc. dealer and was quoted.

New 2002- 175 EFI 20" Freshwater series- $8,295. (he said there is no difference between fresh and saltwater series, just decals)I don't know about any of you??

New 2002- 150 Optimax 20" $9,395 3yr warr.
New 2003- 200 EFI 20" $ 8,975. 2yr warr.
New 2003- 150 Carb 20" $ 7,850 2yr warr.

Hydr. Jack Plate- $ 650.
Control Package- $ 440.
SS Prop - $ 350.
SC1000 gage- $ 425.
Labor- $ 1,250.

Total- $ 3,115. + Motor! What do you guy's think?

If I went with the 150 Optimax,and eveything,

$ 12,510.00

mhoyt01 posted 08-07-2003 02:58 PM ET (US)     Profile for mhoyt01  Send Email to mhoyt01     
We put on a '00 Yamaha 200 HPDI two year ago, brand new, $11,600 all in, but we did the labor....

Pops puts a couple hundred hours/year on it and it's neve missed a beat. That's what I'd put on your boat. That or a Honda 200/225....


jstachowiak posted 08-08-2003 08:34 AM ET (US)     Profile for jstachowiak  Send Email to jstachowiak     
The difference between Saltwater and Freshwater Merc's is on Saltwater they have stainless bolts and nuts.

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