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Author Topic:   19' Outrage II with Yamaha 150-HP SHO
mkelly posted 07-31-2015 12:16 PM ET (US)   Profile for mkelly   Send Email to mkelly  
[Seeks readers with] experience with the Yamaha SHO models. The talk on the street is the 150 would be a great fit for [acceleration from a standing start and] top end [boat speed] on my Outrage 19 II. I guess [the reason for the anticipated improvement in accelleration from a standing start and in maximum boat speed are due to the Yamaha 150-HP SHO outboard engine having a] bit more displacement [and] gearing. This exceeds my limited mechanical knowledge so I'm reaching out. It's 2:1 gear ratio, and 2.785-liter
tedious posted 08-01-2015 07:17 AM ET (US)     Profile for tedious  Send Email to tedious     
Unlike the larger V6s the four-cylinder SHOs do appear to be more than just different graphics. They have a bit more displacement and higher compression ratio. I'd bet the 150 would do very well on an 18 or 19-foot Boston Whaler. Try it and report back.

I just noticed the SHO requires 89 octane, rather than 87. That might be annoying or impractical depending on where you are located.

jimh posted 08-01-2015 11:56 AM ET (US)     Profile for jimh  Send Email to jimh     
Typically there are models in the outboard engine line of most manufacturers that are designated with some sort of label that suggest they have more power or run faster. These models sell at a premium price compared to their companion engines of the same rated horsepower. In some cases these models have larger displacement. In some cases they are tuned for maximum speeds, although exactly what that means is nebulous. Boat speed is a function of horsepower, and if a boat goes faster with a particular engine the most reasonable conclusion is that engine has more horsepower.

Whether or not the premium price charged for the enhanced model is worth its greater cost in the production of greater boat speed remains to be evaluated by the buyer. If your goal is to get the maximum boat speed with an engine whose horsepower decal says "150", then look at one of the enhanced 150-HP models. Compare the cost to the standard 150-HP. Then decide if going 1-MPH or 2-MPH faster is worth the cost. Decide how often you will be operating the boat at full throttle and want to coax out another 1-MPH or 2-MPH in boat speed.

For some boaters, the allure of having some sort of special cowling decal and special cowling ornamentation designating their engine as a special version distinct from the standard version is itself worth the premium price.

Regarding the ability of an engine to very rapidly accelerate a boat from a standing start, I have to wonder how important that really is to most boaters. I recall I was boating with a good friend who owned a beautiful OUTRAGE 25 that was over-powered with 400-HP. I was at the helm, and I asked him how the boat accelerated when you pushed the throttle to full from a standing start. At that point in time he had owned the boat for more than 15-years and had hundreds and hundred of hours operating it. I was quite surprised by his response. He said, "I don't know. I have never tried it."

I can't recall that I have ever tried accelerating from a standing start at full throttle with my boat, either. I just don't see any need to do it. About the only time the ability for a boat to accelerate extremely rapidly from a standing start is required is when being testing by some boating magazine for a performance report.

If you think that you will be frequently using your engine to accelerate your boat from a standing start at full throttle, then getting an engine with larger displacement will probably improve that acceleration. If that is important to you, then, again, the added cost of the the premium model might be justified.

mkelly posted 08-01-2015 12:39 PM ET (US)     Profile for mkelly  Send Email to mkelly     
[Changed topic to begin discussing the nature of the replies, not the information in the replies. Please move that discussion to email.-jimh]

I will report on the Yamaha.

[Changed topic to something completely different. Please start a new thread for your new topic. Thanks--jimh]

NewportMe posted 08-03-2015 01:22 PM ET (US)     Profile for NewportMe  Send Email to NewportMe     
Perhaps he is going to use the boat for water skiing. I accelerated my boat from a standing start to between 20 MPH and 28 MPH around 50 times this past weekend while towing many different water sport enthusiasts. I did not Time these runs but did appreciate the acceleration.


mkelly posted 08-03-2015 07:30 PM ET (US)     Profile for mkelly  Send Email to mkelly     
I'm just looking at this thinking I'm buying a brand new motor, it claims better hole shot & top end, why wouldn't I consider it. Price may be a consideration, we shall see on that one. Anyway, I'm getting close & will update when it happens.
jimh posted 08-04-2015 04:01 AM ET (US)     Profile for jimh  Send Email to jimh     
Changing the propeller pitch and type of propeller can improve the performance of an outboard engine and boat used for pulling water skiers. A special propeller for water skiing use is probably less expensive than buying a more powerful engine.

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