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Author Topic:   2007, 2008, 2009 Montauk owners.
WT posted 03-05-2009 02:38 AM ET (US)   Profile for WT   Send Email to WT  
I would like to know if any of your 170 Montauks can hit 46 mph at WOT. (If speed is taken on a river, I'm assuming you have averaged both upstream and downstream speeds.)

If not, what is you speed at WOT?

Perhaps some information about water conditions, passenger weight, extraordinary equipment, loading, etc... would be helpful.



GreatBayNH posted 03-05-2009 09:00 AM ET (US)     Profile for GreatBayNH  Send Email to GreatBayNH     
2007 Montauk 170 with Mercury FOURSTROKE EFI with yamaha powerhead. I've hit 41 MPH only once. It was on a calm fresh water lake with about 300 pounds of persons and little to no cargo on board. I probably had 10 gallons of fuel. The speed was recorded on a GPS.

Most of my boating is in the turbulent waters around Portsmouth harbor, NH so WOT is done very infrequently. When I do get a chane at WOT my speed is around 40 MPH, tops.

SC Joe posted 03-05-2009 11:06 AM ET (US)     Profile for SC Joe  Send Email to SC Joe     
As I reported in another thread, I've hit 44 mph on a calm saltwater river. It was about 85-90 degrees outside, very little wind. I had about 170 pounds of me on board, how much ever saftey equipment weighs, and about 6 gallons of gas. Boat had less than 15 hours on the motor when this was done. For that reason alone, I feel like that given the right wind and wether conditions, I could do faster than that.

Tohsgib posted 03-05-2009 11:25 AM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
Those 170 hulls must be real slippery or those engines are more than 90hp. My friend had a 2003 with a 2 smoke and she would barley break 40. A classic 17 which is 450+lbs lighter will only fetch low 40's. I had one with a 115 and she maybe did 46 on a good day. What is the current running when you are getting these speeds? One way or both ways trials or is this you "best" speed ever kinda deal but you normally can only fetch 42?

I am not saying it is not possible but a 1400lb hull and a 400lb engine does not make for a good recipe with only 90hp. My 1650lb hull and 115hp on a jackplate will barely touch 40. Same hull with a prop rated 140hp would do low 40's.

Feejer posted 03-05-2009 12:11 PM ET (US)     Profile for Feejer  Send Email to Feejer     
44mph via GPS
Dead flat fresh water
me on board (220lbs)
10 gallons of fuel
Laser II prop, not sure size
chuck21401 posted 03-05-2009 03:49 PM ET (US)     Profile for chuck21401  Send Email to chuck21401     
I have a 2008 170 Montauk with the Mercury 90.

I posted this message back in August 2008:

"This time the water was perfectly calm so I was able to trim the motor up a bit more. WOT yielded a needle's width under 6000rpms and 44.3 mph"

Just a bit more detail...I was by myself and the boat was lightly loaded.

I am considering moving the engine up a mounting hole or two to see if that makes a difference.

Actually, how can I convert the Merc 90 to a Merc 115? Same block right?

chuck21401 posted 03-05-2009 03:52 PM ET (US)     Profile for chuck21401  Send Email to chuck21401     
Here is a picture of the stock mounting height. The engine is all the way in, but if it were titled up a bit the hull and cavitation plate would be about even. jpg

Nauti Tauk posted 03-06-2009 08:39 PM ET (US)     Profile for Nauti Tauk  Send Email to Nauti Tauk     
I run 44.3or4 mph(two way average) in freshwater with the trolling motor on the bow,anchor with 10' chain and rode, and a second battery for the troller. I'll be over at the Homassas rende. next week and if the opportunity arises I'll pull the heavy stuff off and give it a run in the Gulf. I'm pretty sure between 45 and 46 is doable. I have a 2003 90 4s (carbs)mounted two holes up running a tweaked Laser II.
WT posted 03-07-2009 01:54 AM ET (US)     Profile for WT  Send Email to WT     
I have a copy of a 2007 Boston Whaler Engine Performance Test for the 170 Montauk with 90 hp FourStroke that says top speed is 46.6 mph at WOT at 6100 rpm.

I have the new 90 FourStroke motor on my 2004 170 Montauk and with it heavily loaded up I can hit 44 mph at WOT. I think I can improve my top speed by raising my motor.

So I was just wondering if anyone has been able to hit 46.6 mph with their 170 Montauk.



Perry posted 03-07-2009 11:33 AM ET (US)     Profile for Perry  Send Email to Perry     
Warren, I remember seeing that performance report for the 2007 170 Montauk listing top speed as 46.6. I wonder why the same exact boat and motor combination for 2009 has a listed top speed of 42.8 MPH at 5900 RPM?
WT posted 03-07-2009 01:13 PM ET (US)     Profile for WT  Send Email to WT     
Here are the performance tests.

This one dated 7-18-06. current=2007170Montaukperformance.jpg

This one is dated 11-12-07. current=2009170Montaukperformance.jpg

Maybe Mercury tuned down the more recent 90 FourStroke?


SC Joe posted 03-07-2009 08:42 PM ET (US)     Profile for SC Joe  Send Email to SC Joe     
The newer test had about 82 pounds more weight, maybe that had some affect on the test? And the fuel usage was also almost 1 gph less on the new test.

It is only 3.8 mph.

sapple posted 03-08-2009 06:53 PM ET (US)     Profile for sapple  Send Email to sapple     
My boat is a 2007 170 Montauk with a Merc 90 EFI FOURSTROKE. On one occasion I hit 42 mph. In the boat were two people (combined weight about 300 lbs), two fuel tanks, Bimini top in up position (but not open) and a small amount of gear. This was on a flat lake with little wind. I did this for only about 5-10 seconds so don't really know what would have happened if I kept it there a little longer. As soon as I hit 6000 rpm, I looked at the tack and GPS, noted the readings, and slowed down. Mabey if I had only one person, one fuel tank, and the bimini down on the aft seats and held it there a little longer I could have squeezed 1 or 2 more mph out of it.
high sierra posted 03-09-2009 06:40 PM ET (US)     Profile for high sierra  Send Email to high sierra     
My 170 Montauk would do 49.5 on GPS. Did hit 50 once or twice with the right conditions. Of course I failed to mention it had a 115 Merc 4 stroke on it. It was a little slow off the line due to prop sizing. This was while racing Jock Marlow down at the rendezvous at snug harbor 2 years ago.high sierra

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