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Author Topic:   Montauk and 115HP
jdbrassord posted 05-05-2004 09:19 AM ET (US)   Profile for jdbrassord   Send Email to jdbrassord  
I am considering purchasing a Montauk that has a 115 HP Johnson. I'm a bit concerned that this may be overpowered as I typically see Montauks with 90 HP or less. What can I expect from a 115? Trim problems, fuel consumption, structural issues, etc, etc??

Many thanks!!

Legobusier posted 05-05-2004 02:50 PM ET (US)     Profile for Legobusier  Send Email to Legobusier     
Personally I think it's too much power.

I have a Montauk w/a 90hp 4 stroke (Honda) and at WOT it does about 43 mph on GPS. Steering is ok, but the overall ride is a bit hairy. I certainly wouldn't want to go any faster. In fact, I don't plan on taking it up that fast again unless I have a real good reason (this was a solo test ride).

I don't know if I'm getting old or what, but I don't need or want to go that fast - at least not in this boat.

I doubt you would have any structural issues, but anything's possible. Fuel consumption varies depending on a lot of factors (2 stroke, 4 stoke, age) If you like the boat, you could alway buy it and "trade down" the engine to a dealer for a 70 or 90 at little or no cost depending on the condition of the engines in the deal. My father did the exact same thing on an overpowered 16' McKee Craft. I think it had a 175 on it...yikes!

Hope this helps & good luck,

Mumbo Jumbo posted 05-05-2004 07:44 PM ET (US)     Profile for Mumbo Jumbo  Send Email to Mumbo Jumbo     
Simply put, it is too much power. How fast do you want to go? What do you need a 115 for? A 90hp engine is more than enough to do anything the Montauk was designed to reasonably do. Consider your body, your passengers, the environment, sea turtles. dolphins and submerged logs when you decide to overpower your Whaler. If you are into speed, you need to get a tunnel hull and plenty of safety gear to go with the excessive horsepower.
brisboats posted 05-05-2004 10:54 PM ET (US)     Profile for brisboats  Send Email to brisboats     
Its not too much power. The difference between a 90hp Johnson and a 115hp Johnson is in the upper end of the rpm range. In other words in typical use, cruising, and out of the hole you would be hard pressed to tell the difference between a 90hp and a 115hp. Lots of Montauks are rigged with 115 OMC's and are doing just fine without endangering the operator. These motors are based on the same block and weigh the same. The 115hp is not going to put anymore stress on your transom than a 90hp. I would not pass on a nice Montauk because of the 115.


Joe Kriz posted 05-06-2004 12:00 AM ET (US)     Profile for Joe Kriz  Send Email to Joe Kriz     
I agree with brisboats for the most part..

The Montauk is rated for 100 HP... If a 90 HP and a 115 HP weigh the same, then there is no reason you couldn't put on the 115... Just don't use the extra HP... You may be able to have the engine de-tuned back to 90 or 100 HP if this is possible with your engine.. You didn't mention what year the engine was.. Maybe you could also use some sort of throttle limiter?

I am not fond of overpowering any vessel but doing the above would achieve the acceptable power rating in my book... Maybe not the insurance companies though..

AQUANUT posted 05-08-2004 06:30 AM ET (US)     Profile for AQUANUT  Send Email to AQUANUT     
want to know how to fish ask a man who fishes....there are many that will tell you how to fish....seems like a topic that anyone should be able to logically figure out and rationalize....if your really seeking I think you are..ask a person who has a 115 on their boat...that is as close as you can get to finding out what it is like without driving it yourself....good luck

happy with a 115hp

Joe Kriz posted 05-08-2004 09:30 PM ET (US)     Profile for Joe Kriz  Send Email to Joe Kriz     

He did ask and you didn't give him much of an answer.....

I gave my perspective and feeling on the subject...
If you have better information or experience, then why play games?

Everyone here is trying to help and yes, give their opinion.... I know, everyone has an opinion and that is what you are basing your saracstic response to...

Please, AQUANUT, enlighten the rest of us lowly Whaler owners who know nothing.... Yes, I am being sarcastic....


AQUANUT posted 05-08-2004 09:41 PM ET (US)     Profile for AQUANUT  Send Email to AQUANUT     
hey joe
no violence
everyone is entitled to an opinion.....and certainly none are discounted....but uless a person drives a porsche...or a do you describe what it is like?....
anyway,,more info is always a better decission.....just installed a new 90 hp saltwater opti on a new montauk.
haven't driven it ...but I know it will be awesome...
justa gut feeling....based on a experience I never had....

p.s. my momma never ever place yourself above those arround please understand I am not trying to tear down anyone personally...but warn a new person that ask a intelligent question...that there are those in this media that will comdem for even thinking of such thoughts of a 115 hp on a montauk god its unamerican to put that much horsepower on a k fine

Buckda posted 05-08-2004 09:42 PM ET (US)     Profile for Buckda  Send Email to Buckda     
I don't own an "overpowered" boat by manufacturer specs...but I'd suggest you put in a query to your insurance company for a quote. State the power explicitly so the quote comes back with that power stated. Some companies won't write policies for boats with more than the maximum MFG HP rating, but others will.

I see this as the biggest concern *and liability claims in case of an accident*.

Other than that, the boat should handle the extra ponies fine.


BobMac posted 05-08-2004 10:15 PM ET (US)     Profile for BobMac  Send Email to BobMac     
I also would not pass because of the motor. As was stated the 115 Johnson is the same motor as thier 90hp. Just like most 75hp Merc outboards are a detuned 90hp merc. Same block, foot, weight, etc.

While I wouldn't pass on a good deal because of the 115, I would never power one with a motor of that HP. I have a 1964 16' that I've revived. I put a 60hp Mariner on mine and it pushes it just fine as long as I don't load it down. Even loaded down with three men and gear it plans out nice and runs 25 to 30mph. On a cold damp morning, running with the current on the ICW at WOT my GPS read 42 MPH. That's tops with a light load and a little help from the tide and the air temp. It normaly runs around 35 at 5600 rpm with just me and gear.

I know of a retired Coast Gaurd Captain who had a Montauk with a 50hp 4 stroke Merc and two 6 gallon tanks of fuel that he would run 40 miles off NE Florida's shore and come back with a mess of Dolphin and Kings that would make any angler proud! I'll take that over any hopped up Montauk that returns to the ramp at record speed.

Personaly I think a 75hp 4 stroke would be perfect on my boat, but I havn't hit the lottery, YET!

Joe Kriz posted 05-09-2004 11:04 AM ET (US)     Profile for Joe Kriz  Send Email to Joe Kriz     

There are plenty of people that have 115's on a Classic Montauk hull..

Where does he mention the new 170 hull? I guess you know him..

There are also a couple of people here that have a 115 on the new MT 170 Hull and really like it..

As I mentioned above, nothing wrong with a 115 on either of these hulls...
However, his question was about overpowering... If he is concerned about too much power, then he could do as I mentioned above..

Whether I have owned a Montauk with a 115 on it or not doesn't matter here..
We all know it is overpowered. No if's, and's, or but's.. Period...
A fact is a fact.....

brisboats posted 05-09-2004 12:29 PM ET (US)     Profile for brisboats  Send Email to brisboats     
I think my point has been lost so I will try to reiterate it. The difference between a 90 hp and 115hp OMC crossflow in real world use is very little in my opinion. The 90hp has a significant amount of torque and it can be argued that it may have more than a 115hp. Therefore out of the hole and to cruising rpms they are about the same motor. The 115hp is producing the additional power in the upper rpms. So yes the boat is overpowered but as long as you are not running wot it really differs very little than a 90hp. Ironically, if you were to build a go fast crossflow engine most would seek out the 90hp block as it has more beef and stronger rods. Why will my Cadillac with a 4.9 liter 200hp engine run almost neck in neck 0-60 with its 300hp Northstar brother? Its because of the torque. I have 275ft lbs and I forget what the Northstar has but it is close to that. In the real world torque is often more important than a horsepower rating. Bottom line the 90hp V-4 crossflow produces a lot of torque.

If the overpowering bothers you change the cowl. A new 100hp would be prop rated and you are probably looking at a crankshaft rated motor that has some hours on it. When you take those factors into consideration you are probably not overpowering at all. If the boat is what you want again do not pass because it says 115hp on the cowl.

Yes my Montauk has a 115hp, but it is a mercury. Sure it is overpowered but when I bought her she had big letters on the side that said POLICE and on the transom was a crossflow 140hp. Now that may have been overpowered.


standfast posted 05-12-2004 03:52 PM ET (US)     Profile for standfast  Send Email to standfast     
My SS 17 ended up with a 115 instead of the 90 we ordered (long story)and it has been just fine. There were times that it felt like there was about 6 inches of boat left in the water when it was trimmed up and screaming along, but back then I was young and foolish.....
Just use common sense and make sure to check in to the potential insurance problems.
LHG posted 05-12-2004 06:39 PM ET (US)     Profile for LHG    
In 1988 I sold a mint condition, stress-crack free, 1971 Nauset (see 16 Reference section for photo) which for it's entire 10,000 hour life had been powered with a Mercury in-line 6 115HP or 150HP (remember those) engine.

Yes it was VERY fast (51-55mph) and definitely not for kids when running wide open, which I practically NEVER did. But the quiet, low RPM mid-range cruising and load carrying ability, was terrific. I thought it was an excellent power/boat combination. This gives long engine life also.

I would not pass on the boat becauses of an OMC 115. Insurance IS possible

buddy79 posted 05-12-2004 10:32 PM ET (US)     Profile for buddy79  Send Email to buddy79     
Why are people here so hung up on insurance? Are you that bad of drivers? I have a 175 on my new Montauk and just insure the boat, no insurance on the motor. Other than theft I dont really worry about it. Pretty soon insurance companies will rule the world and everybody will stay at home under the covers. My grandparents are 83 years old and never bought insurance until it was required by law and then only purchased liability. I think of all the money they saved and here I am paying outrageous premiums every month and scared to file a claim because then it'll just go up even more. Maybe they had it figured out all along. My boat with the 175 wont go but exactly 13 knots over the previous top speed but the way it gets there is all the difference. I think you'll be happier having the extra power in the end, especially when you load it up with people and gear.
frank_king posted 05-13-2004 05:31 PM ET (US)     Profile for frank_king  Send Email to frank_king     
i have a 1982 montauk and 1997 60 degree v4 115. the boat is/is not over powered....... i ask the insurance rep about insurance and he said, and i quote, "no problem".

the diff in performance is "slight" over the 90. i know because i have put on a 70, 90 crossflow, and now the 115.

get the boat and motor package, you wouldn't be able to tell the dif between the 90 and the 115.

you will have no more problems etc.etc. from the 115 that you would have from any other outboard no mattter the hp rating.

mr king

JayR posted 05-13-2004 08:41 PM ET (US)     Profile for JayR  Send Email to JayR     
Friend has the same set-up and it is great.

He just doesn't get a chance to open her up much.

No problem.......

jws posted 05-14-2004 08:20 AM ET (US)     Profile for jws  Send Email to jws     
There is one rough looking 16' classic pre-smirk hull in my area with a 200 HP Mercury. Goes down the canal with an extreme bow high attitude. Another one nearby is the most beautiful classic 16 I have ever seen. Totally redone and painted with a white interior and exterior. The boat has the most beautiful finish I have ever seen. Everything on the boat is absolutely perfect. Power is a v6 150 hp Mercury.

How much power is too much? The owners of those two boats would say a 115hp is way underpowered. Since the thought of 115 brings thoughts of worry to your mind then stick to a 90.

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