1989 OUTRAGE 18, Yamaha F150

Optimizing the performance of Boston Whaler boats
FLDC001
Posts: 4
Joined: Thu Nov 17, 2016 12:29 pm

1989 OUTRAGE 18, Yamaha F150

Postby FLDC001 » Thu Nov 17, 2016 12:56 pm

I am just starting a complete restoration of an 1989 OUTRAGE 18. I already bought a Yamaha F150. I suspect that [the boat] will be fully operational by April 2017.

The reports I have read in regard to putting the 150-HP four-stroke-power-cycle engine on [a classic Boston Whaler OUTRAGE 18 boat] are [for a top boat speed of] 42 to 45-MPH. I couldn't find anything on [accelerating from a standing start at maximum throttle], but I did read about porpoising. I already bought a plate to jack up the height a bit, as [porpoising] is caused by the increased weight; I plan on moving battery forward to the console; it belongs there anyway.

Will keep you posted on progress.

[Separated from another thread on a re-power with an F150 but on a completely different model of Boston Whaler boat]

jimh
Posts: 11673
Joined: Fri Oct 09, 2015 12:25 pm
Location: Michigan, Lower Peninsula
Contact:

Re: 1989 OUTRAGE 18, Yamaha F150

Postby jimh » Thu Nov 17, 2016 2:01 pm

With the range of engine mounting height available using the standard BIA engine mount, you can raise the engine three-holes-up or 2.25-inches higher than mounting in the lowest position. It would be unusual to be able to run the engine much higher than this.

Typically a jack plate also gives some set back, which also helps to permit higher engine mounting heights. What is the set-back distance of the jack plate you bought?

bwc8418
Posts: 2
Joined: Sat Oct 24, 2015 2:40 pm

Re: 1989 OUTRAGE 18, Yamaha F150

Postby bwc8418 » Thu Nov 17, 2016 2:30 pm

FLDC001--I have a 1984 18 Outrage with a Honda BF150, and I have been running the Honda since 2004. Depending on how much weight you have [aboard the boat], I believe [the maximum boat speed should be] maybe 47 or 48-MPH. I have used a GPS and have registered 48-MPH--seemed like I was flying.

[My 1984 Boston Whaler OUTRAGE 18 does] not have a jack plate; the [static trim of the boat is within] about one inch--more or less--of where it [was] before re-power. The boat batteries are moved forward. The engine is mounted in [described a mounting position that was ambiguous--please use the method of describing engine mounting height in terms of the number of units of "holes" or 0.75-inch the engine mounting height has been raised from the lowest position].

I have not experienced any proposing or concerns about acceleration. Enjoy your boat--Joe

User avatar
Phil T
Posts: 2602
Joined: Thu Oct 22, 2015 6:08 pm
Location: Was Maine. Temporarily Kentucky

Re: 1989 OUTRAGE 18, Yamaha F150

Postby Phil T » Sat Nov 19, 2016 9:04 pm

Jackplates and setback increase the propensity for a boat to porpoise.

You should mount the motor without the jack plate and test the performance.
1992 Outrage 17
2019 E-TEC 90
2018 LoadRite 18280096VT
Member since 2003