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Author Topic:   170 MONTAUK: Epoch of 90-HP Mercury Engine Options
masbama posted 03-15-2015 09:11 PM ET (US)   Profile for masbama   Send Email to masbama  
Was the model of Mercury 90-HP FourStroke outboard engine that weighs 360-lbs offered on the 2014 Boston Whaler 170 MONTAUK? Or, did Boston Whaler start [using that engine] with the 2015 models?
tedious posted 03-16-2015 06:41 AM ET (US)     Profile for tedious  Send Email to tedious     
Are you sure it's a cutover based on model year? I would guess they'd just use up the heavier, older style engines and then switch over.
jimh posted 03-16-2015 08:58 AM ET (US)     Profile for jimh  Send Email to jimh     
How is the Mercury 90-HP FourStroke engine that weights 360-lbs recognized? It there an obvious physical difference between the Mercury 90-HP FourStroke model that weighs 360-lbs and previous models of the Mercury 90-HP FourStroke that apparently weighed more? What is a good way to distinguish them?
jrp posted 04-03-2015 04:01 PM ET (US)     Profile for jrp  Send Email to jrp     
The engine cowl is different shape/color.

I believe the cut-off occurred sometime DURING model year 2014. There is a local dealer here with a leftover 2014 Montauk 170 with the old 1.7 liter engine rigged on it.

By the way, some of the weight savings for the new 2.1 liter engine comes from elimination of the alternator. Instead, a flywheel stator is used.

jrp posted 04-04-2015 06:30 AM ET (US)     Profile for jrp  Send Email to jrp     
<< The engine cowl is different shape/color. >>

I should have been more clear on that. The decal on the engine cowl has a slightyl different color scheme. But this is difficult to notice unless it's side-by-side with the old engine.

However, the cowl shape is distinctly different. There are lots of differences in shape, but the most conspicuous aspect is the way the rear side of the cowl rakes forward to meet the top surface of the cowl. Instead of a an almost 90* corner where the top and back sides meet, the new engine has a much gentler transiton due to the oblique angle.

Overall, the new engine has a more streamlined and much less bulky appearance.

Hopefully Mercury will come out with a 125-135 HP version of this new 2.1 engine.

boatdryver posted 04-04-2015 08:38 AM ET (US)     Profile for boatdryver  Send Email to boatdryver     
Is the "new" 2.1 litre, in-line four cylinder, fuel injected four stroke design 90 HP Mercury Outboard motor manufactured in Wisconsin?


jrp posted 04-04-2015 10:52 AM ET (US)     Profile for jrp  Send Email to jrp     
Yes, it is made in WI/USA.
jimh posted 04-05-2015 10:22 AM ET (US)     Profile for jimh  Send Email to jimh     
Just going from memory, I think there are four [or perhaps only three] epochs of outboard engines called "90-HP FOURSTROKE" models from Mercury. They are:

--a 1.596-liter in-line four-cylinder engine with a powerhead made by Yamaha. Mercury bought the power head from Yamaha, and attached it to a midsection and gear case made by Mercury. These engines had carburetors. There were notorious and chronic problems with the carburetors. These engines were called Merc-aha (as in MERCury combined with yamAHA) 90 engines, and were in production until c.2005.

[I thought there was a 90-HP model with EFI, but I think that's wrong. I can't find it listed in any of the old catalogues I have. The 115-HP was EFI but the 90-HP wasn't.--jimh]

--a completely new, all-Mercury model, derived from the basic in-line four-cylinder design of the VERADO, but without the supercharging. This engine had a displacement of 1.7-liter. Its cowling was quite unusual, as it had a rounded dome top. This family of non-supercharged engines derived from the VERADO were called the VERADITO (from Spanish, for little or petite VERADO), as a way of distinguishing them. These engines were made around 2006.

--another completely new, all-Mercury model, with some harmony with the newer 150-HP FOURSTROKE engine, which came out in 2014. This engine has 2.1-liter displacement. Like the 150-HP, it seems to be designed with simple maintenance in mind, and has a lot of displacement for the horsepower produced.

If others can contribute more details, we could have a better cataloging of these four "90-HP FOURSTROKE" engines. Perhaps we can get some better dates, more information about weight, and more about displacement. Jump into the discussion if you have some details to add.

jrp posted 04-05-2015 01:06 PM ET (US)     Profile for jrp  Send Email to jrp     
What little info I have concerns the latest 2.1L engines.

These were introduced by Mercury in June 2014 and began showing up on some Whaler models (e.g. Montauk 170, w/ 90HP) during the late 2014 model year. But as noted above, most model year 2014s probably had the 1.7L engine. Presumably, the farther into the model year, the more likely the 2.1L engine was used.

Like the previous version, the 2.1L engine is offered in 75, 90, and 115 HP versions.

The 2.1L engine is significantly lighter than the previous 1.7L engine. The valve train is self-adjusting, to reduce maintenance requirements. Also, a new Command Thrust gear case is now optionally available, allowing these higher displacement engines to turn a larger prop.

One cause of identity crisis with these engines results from Mercury using an image of the old 1.7L engines when they issued their press release announcing the new 2.1L engine. Here is the press release, which unfortunately/confusingly uses an image of the old 115HP 1.7L engine:

And here is what the new 2.1L engine actually looks like. Notice how the rear side of the engine cowl rakes forward, and the lower seem of the engine cowl follows a curvaceous path, rather than a straight seem as on the old 1.7L engine:

tedious posted 04-08-2015 04:21 PM ET (US)     Profile for tedious  Send Email to tedious     
Do these new motors eliminate the cast iron sleeves in the block, as some other larger motors of different brands have done?

I ask because I am interested to see this technology trickle down - the weight and size savings in the smaller motors will be proportionally greater.


jimh posted 04-09-2015 09:34 AM ET (US)     Profile for jimh  Send Email to jimh     
Here are some more details, this time culled from old catalogues instead of my memory:


2001 TO EARLY 2006

The Mercaha or YamaMerc engines
--Mercury 90-HP FourStroke using Yamaha power head
--1.596-liter displacement, four-cylinder, in-line
--four-valve, dual overhead cam
--carburetor fuel induction
--no SmartCraft electronic instruments
--cowing was squarish, and about the same size as a 200-HP two-cycle engine cowling.

The simplest method to identify a Yamaha engine sold as Mercury: they don't have SmartCraft electronic instrumentation.

Around 2006 Yamaha was offering their 90-HP four-cycle engine with EFI. In a 2006 Boston Whaler catalogue, the 170 MONTAUK boat is listed as having a Mercury 90-HP EFI engine, and the pictured boat has the cowling style of the Mercaha or YamaMerc engine. I haven't found a 2006 Mercury catalogue that shows this engine. There may be a few of these Mercury-brand Yamaha-block 90-HP EFI engines, or maybe not.

2006 TO 2014

The VERADITO engines
--Mercury 90-HP FourStroke using Verado block
--1.732-liter displacement, four-cylinder, in-line
--four-valve, dual overhead cam
--simple electronic fuel induction
--SmartCraft electronic instruments
--cowling was taller and had a domed round top

IN 2014

The "New" engines
--Mercury 90-HP FourStroke using new block
--2.1-liter displacement, four-cylinder, in-line
--two-valve, single overhead cam
--359-lbs in small gear case model; 363-lbs in large gear case model
--simple electronic fuel induction
--SmartCraft electronic instruments
--cowling has new trapezoidal shape
--option of larger gear case called "Command Thrust" said to improve efficiency

fishin8tor posted 04-18-2015 12:46 AM ET (US)     Profile for fishin8tor  Send Email to fishin8tor     
I have one of those 2005 Montauk 170 with a fuel injected Mercury-Yamaha engines. It has been a great engine and I have never had a problem in 10 years.
jimh posted 04-18-2015 09:50 AM ET (US)     Profile for jimh  Send Email to jimh     
Is that engine a 90-HP?

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