1986 Outrage 18 Johnson 150

Optimizing the performance of Boston Whaler boats
VKR
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Joined: Sat Oct 17, 2015 8:39 am

1986 Outrage 18 Johnson 150

Postby VKR » Sat Jun 12, 2021 11:07 am

[On a 1986 OUTRAGE 18, a 1986 Johnson 150-HP] outboard engine is mounted one-hole-up. The current propeller is an aluminum 14-1/2 x 19-pitch. With the 19-pitch propeller the engine can accelerate at full-throttle to approximately 5,500-RPM.

The OUTRAGE 18 is mainly for just general getting around Chesapeake-Bay-type waters and trolling speeds.

I may upgrade to a stainless steel propeller. Investigation on this site gives me confidence I am good with a one-hole-up set-up and the 14-1/2 x 19 pitch propeller size. I also found a few people suggested the OMC SST II stainless steel propeller in the same size as a good stainless-steel option.

Prior to purchasing an OMC SST II stainless steel [three-bladed] propeller—if still available—is that still a good option?

Or, should I be considering some other propellers that are newer or have been proven-out?

jimh
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Re: 1986 Outrage 18 Johnson 150

Postby jimh » Sat Jun 12, 2021 12:58 pm

At the 150-HP power level, I am sure changing to a stainless steel three-bladed propeller like an OMC SST II would produce some improvement in performance.

There should be plenty 17-pitch SST propellers on the used market. They were the standard go-to choice for OMC engines. I expect you could buy a used one for $100 to $150.

Check the number of splines on the propeller shaft and the hub diameter of your engine. I think the SST propellers were available in several hub diameters.

ConB
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Re: 1986 Outrage 18 Johnson 150

Postby ConB » Sat Jun 12, 2021 2:23 pm

I have an 1987 Outrage 18 with a 1987 Johnson 150-HP mounted two-holes-up with a Michigan Wheel Vortex 19” aluminum propeller.

I could not make myself spend the bucks on a stainless propeller thinking the motor would die soon. Fifteen years later that has come true.

Con
!987 Outrage 18 / 2011 Yamaha F150
1969 13 / 30hp Johnson tiller

VKR
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Joined: Sat Oct 17, 2015 8:39 am

Re: 1986 Outrage 18 Johnson 150

Postby VKR » Sun Jun 13, 2021 8:38 am

ConB wrote:I have an 1987 Outrage 18 with a 1987 Johnson 150-HP mounted two-holes-up with a Michigan Wheel Vortex 19” aluminum propeller.

I could not make myself spend the bucks on a stainless propeller thinking the motor would die soon. Fifteen years later that has come true.


I, too, kept my Johnson 150 crossflow running over the past eight years as funds were diverted to college education. Now, given the age of the boat and my reluctance to add 100-lbs to the transom with a modern outboard, I decided to rebuild the Johnson 150.

Although I looked into and found a reputable rebuilder, I'm currently doing the rebuild myself with the help of an outboard machinist-specialist that bored my cylinders .020" oversize. These engines are true workhorses, will take a beating, and have lots of life in them. This engine has over 1,00 hours prior to tearing it down. Of course, they drink fuel like crazy.

I'm optimistically planning ahead for a new propeller; the aluminum propllr is a bit dinged-up.

biggiefl
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Re: 1986 Outrage 18 Johnson 150

Postby biggiefl » Mon Jun 14, 2021 11:50 am

19" SST would be a good fit or see if Con wants to sell his since the engine puked.
On my 24th Whaler. Currently in the stable: 86 18' Outrage, 81 13' Sport(original owner), 87 11' Sport, 69 Squall(for sale cheap).

VKR
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Joined: Sat Oct 17, 2015 8:39 am

Re: 1986 Outrage 18 Johnson 150

Postby VKR » Mon Jun 14, 2021 10:43 pm

biggiefl wrote:19" SST would be a good fit or see if Con wants to sell his since the engine puked.

biggiefl, reading his post a bit closer, it seems he is saying that he never could decide on buying a stainless steel prop. He stuck with the aluminum one.

biggiefl
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Re: 1986 Outrage 18 Johnson 150

Postby biggiefl » Wed Jun 16, 2021 9:01 pm

I would NEVER run an aluminum propeller on an engine over 15-HP. The OEM OMC SST props are a good fit on those engines and can be found on E-Bay for $100-150.
On my 24th Whaler. Currently in the stable: 86 18' Outrage, 81 13' Sport(original owner), 87 11' Sport, 69 Squall(for sale cheap).

VKR
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Joined: Sat Oct 17, 2015 8:39 am

Re: 1986 Outrage 18 Johnson 150

Postby VKR » Wed Jul 28, 2021 10:29 pm

I just realized my 1986 Johnson 150 was mounted two-holes-up. I am getting ready to mount the outboard. Should I mount the outboard one hole up or leave it at two holes up?

Prior to the rebuild and using an OMC aluminum 14 1/2 x 19 prop, I would get some minor porpoising at higher speeds and and the engine trimmed out a bit.

Looking for the best height for this 1986 Johnson 150 with a planned OMC SST II, 14 1/2 x 19 propeller.

Is it one hole up or two holes up?

Thanks,

Blackduck
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Re: 1986 Outrage 18 Johnson 150

Postby Blackduck » Thu Jul 29, 2021 1:05 pm

The best prop for your boat used to be a Stiletto 14 1/4 X 17 stainless, engine mounted 3 holes up. Problem is the company is gone. Maybe someone here knows a good substitute.