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Author Topic:   Montauk 170 prop
Matthew posted 03-20-2003 07:15 PM ET (US)   Profile for Matthew   Send Email to Matthew  
I'm currently running a 13" x 21p Black Max aluminum on my 2 stroke 90 merc and turning about 5000-5100 rpms. I would like to get into the upper portion of the operating range.
Knowing I need to drop in pitch:

If you have a Montauk 170 with a 2 stroke 90,
what are you currently running and how is your performance?

Would a Mercury Vengeance 13 x 18p be to big of a drop?

Is there a Mercury prop that you would recommend?

I have a line on a reconditioned SS Mercury 13 x 19, it doesn't have the mercury flow torque hub system. When was that system introduced?

I've also found a brand new Mercury Black Max aluminum 13 x 19 for $95.

Thanks in advance for your thoughts,


Bigshot posted 03-21-2003 10:05 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Skip the alum and get the recond 13x19. That new hub system is neat and really new but obviously not necessary.
InHerNet posted 03-21-2003 12:50 PM ET (US)     Profile for InHerNet  Send Email to InHerNet     
I changed to the Laser II. I would highly recommend it.
Matthew posted 03-21-2003 04:49 PM ET (US)     Profile for Matthew  Send Email to Matthew     
I'm going to test the reconditioned SS
13 x 19 Saturday.

What pitch is that Laser II?
Do you have any performance numbers?


holmestk posted 03-21-2003 10:31 PM ET (US)     Profile for holmestk  Send Email to holmestk     
I have a 2001 dauntless 16 with the same motor. I switched from the stock merc 13x21 and went to a 13x19. The 13x21 did 43mph at 5200 rpm, 13x19 does 41 at 5500 (sneaks to 5600 if I am not careful w/light load). The acceleration is much better as expected, but I lost a little top end.
Matthew posted 03-24-2003 06:43 PM ET (US)     Profile for Matthew  Send Email to Matthew     
I must say I'm feeling a bit sheepish to report my propeller findings.I had a great day to field test different props today..."piece of glass" calm on Lake Washington.

The 13 x 19 SS reconditioned was first on the agenda and totally trimmed I was out of the operating range. This puzzled me thinking that 19" of pitch would bring me close to the 5500 rpms I was after.

I then re-installed the aluminum 13 x 21 and totally trimmed out I was right at the the high end of the range- 5500 rpms and 44.4 mph on the GPS.

Being this is my first boat with power trim, I wasn't trimming the boat out far enough, (The 15' sport had an adjustable thrust rod, the pick a hole system)and don't run much in the type of water that I was lucky enough to see today.

Feeling stupid but learning,

Rodger posted 03-25-2003 06:39 PM ET (US)     Profile for Rodger  Send Email to Rodger     
Thanks for reporting your findings. My 170 with a 4-Stroke 90 turning 6000 RPM running a 13 X 18 Vengeance prop gives 42.0 MPH average. Looks like the 2-stroke has a bit more top end. We will have to have a side by side comparison at the rendezvous this summer if you know what I mean.

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