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Author Topic:   Repowering an 18' outrage
steelhead5 posted 07-25-2003 06:37 PM ET (US)   Profile for steelhead5   Send Email to steelhead5  
Im looking at buying an 18' outrage, and I have 2 questions for you experts out there. First is the boat has a 200 merc on it, which is 25hp overpowered, so what problems could this have caused to the boat (specifically the transom) . Second is would a 90 hp 4stroke do the trick, (ocean fishing) or do you recommend higher (Min hp is 75)

All help for things to look for is appreciated.

whalersman posted 07-25-2003 07:08 PM ET (US)     Profile for whalersman  Send Email to whalersman     

The Outrage 18 is rated for maximum of 150 HP....

The bare minimum I would consider would be 115 HP but that is very marginal.. I personally would rather have a 4 cylinder 115 HP on my Outrage 18 but I just don't think it would give that much top end..

I would stay in the 130 to 150 HP range... I have even thought about the Suzuki 140 HP 4 Stroke but am still undecided and not ready to repower as yet...

I don't think the boat would have any more damage to the transom then a 150 would have... If the person you bought it from was a speed demon and liked to fly over waves, then you may have a few more spider cracks around the hull. Some small spider cracks are normal, big ones with pieces of glass chipping off may not be so normal...

Check the boat over for any unusual cracks.....

Tom2697 posted 07-28-2003 10:48 AM ET (US)     Profile for Tom2697  Send Email to Tom2697     
What year boat do you have? The classic 18's had a max power of 150hp. I believe the newer 18's could take higher....Can anybody confirm this?

If you plan to do a lot of offshore fishing, I would definitely NOT use too small of an engine. While you would probably be fine most of the time, it is that one time that you need all the power (aft quartering sea) that you would get into trouble.

Shssaildude posted 07-28-2003 02:03 PM ET (US)     Profile for Shssaildude  Send Email to Shssaildude     
I have an 1987 outrage and 2 years ago I put a 115 yamaha 4 stroke on te back it runs great and very quite before I had a 150 on it iI think the boat handles beter with the smaller erngine.


whalersman posted 07-28-2003 05:22 PM ET (US)     Profile for whalersman  Send Email to whalersman     

The 1990 to 1995 Outrage 19's had the same engine capacity as the early 18's.... 150 HP maximum and a minimum of 75 HP to plane....

I do not know where steelhead got his information on the boat having a rating of 175 HP and min of 75 HP to plane.. Maybe a typo on his part?

The newer Outrage 19/20 were made in 1996, 1997, and 1998... These boats had a max rating of 225 HP and a minimum of 130 HP to plane.

Joe Kriz

whalersman posted 07-28-2003 05:25 PM ET (US)     Profile for whalersman  Send Email to whalersman     

I would be interested in knowing your top speed with the Yamaha 115 HP 4 Stroke on the Outrage 18....

Do you have a GPS that you can measure your speed by???

Joe Kriz

Shssaildude posted 07-28-2003 08:03 PM ET (US)     Profile for Shssaildude  Send Email to Shssaildude     
I don't have a GPS but i'm ghessing the boat does low to mid 40's with just me in it.


gvisko posted 07-28-2003 09:12 PM ET (US)     Profile for gvisko  Send Email to gvisko     
I have a brand new johnson 150 (6cyl) on my 18' outrage with 17" stainless prop and the best I can do wot is 44 mph gps . can someone explain
how these guys with the 115 and 140 (4 cyls) get 45 mph
as they state gvisko
acseatsri posted 07-28-2003 11:49 PM ET (US)     Profile for acseatsri  Send Email to acseatsri     
Bottom paint? Is it MPH or knots per hour? I get about 38 knots with bottom paint and Stingray fin- 14.5 X 19 SS prop- not that it matters much- water is never flat enough to trim out and run over 30 anyway- usually run between 17 and 23 knots.
JoeH posted 07-29-2003 09:34 AM ET (US)     Profile for JoeH  Send Email to JoeH     
Gvisko, You get 44 MPH with GPS. They are guessing. Joe
george nagy posted 07-29-2003 10:21 AM ET (US)     Profile for george nagy  Send Email to george nagy     

I'm running a 14.5x19 viper on my 1998 ocean runner and running into 39 knots (gps) and max rpms at barely 5k. The engine is one hole up and trimmed up high enough to still steer easily I'm not able to turn more than 5k. I have also noticed that the bow rides flat and I would really like some more lift.

All in all this setup is much better than the old-school OMC 150 and I would still recomend a new carb johnson 150.


what are your max rpms and how high is your engine mounted?

gvisko posted 07-29-2003 05:42 PM ET (US)     Profile for gvisko  Send Email to gvisko     
George N my boat was doing the same thing yours does. I
was using a 14.5x19 stainless prop and I would get
39mph to 40mph gps at 4900 to 5000 rpms wot
on advise I received on this forum from Sal D I switched
to a 14.5x17" stiletto stainless and now my rpms are up
to 5600 wot at 45 mph I think this is were I should be
hope this helps. I am going to put the 19" prop on the
marketplace if any one needs it.
sternman posted 07-29-2003 09:18 PM ET (US)     Profile for sternman  Send Email to sternman     
I have an 89 outrage with a 99 Honda 130 and it is an excellent set up.Very smooth and quiet,4-5 MPG,30+MPH @ 4000 RPM,40+ WOT.Can't say enough good things about it.
Tom2697 posted 07-30-2003 09:19 AM ET (US)     Profile for Tom2697  Send Email to Tom2697     
Sounds like your new prop was the ticket to better performance...
As for how others are getting better numbers...We must know their exact setup. For instance, I went through 3 props before selecting the one I am now using (14.25x18" Power Tech 4-blade). My max rpm and speed were measured using a GPS, running both into and with the current, boat loaded with me (180lbs), two batteries, 20 lb anchor with about 70 lbs of chain and rope, bimini folded, and about 10 gallons (60+ lbs) of gas. Once I load my boat with another person or two, offshore fishing gear, full fuel (360+ lbs), two coolers, raised bimini, etc., I will be lucky to hit 35 mph while running with the current. Play with one of the speed calculators and try changing the weight of the boat load. You'll be amazed at how much even one person can effect your numbers.

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