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Author Topic:   170 Montauk with Jack Plate

Nauti Tauk posted 07-17-2009 05:20 PM ET (US)
Are any gains to be had [by the addition of a jack plate] on my 2003 170 MONTAUK? With a Mercury 90-HP FOURSTROKE mounted two holes up turning a LaserII propeller, the WOT speed is 42- to 44-MPH depending on load. More top end would be nice, but I'm looking for increased midrange speed with same throttle setting.
Tohsgib posted 07-20-2009 01:48 PM ET (US)
They can't hurt but with a 90hp fetching 44 I doubt you will see more than 46. You may be able to spin a larger wheel and ence your midrange might improve. I run one mainly for draft clearence.
Nauti Tauk posted 07-21-2009 06:57 PM ET (US)
Thanks Nick, wasn't sure if I could get a little more out of her or not. May try jack plate over the winter.
chuck21401 posted 07-21-2009 09:16 PM ET (US)
Is "two holes up" the factory setting or have you raised the engine? I managed 44mph with my 2008 170...with a light load and trimmed out. I saw 6000rpms running the 20" Laser II prop. I've been thinking about raising my engine a hole or two and trying a different prop, perhaps even a blueprinted prop with increased pitch. With that said I'm not sure how much faster I'd want to go in the 170, at 44mph the ride is pretty loose.
chuck21401 posted 07-21-2009 09:19 PM ET (US)
I posted this on another thread but I think it's relavent to this discussion.
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.
http://i157.photobucket.com/albums/t55/cwillmarth/17090mercengineheight. jpg
Nauti Tauk posted 07-22-2009 04:56 PM ET (US)
Chuck,
I raised the engine two holes. I could go one more but am interested in jack plate addition to get prop in cleaner water and hopefully improve cruise speed.

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Author	Topic: 170 Montauk with Jack Plate
Nauti Tauk	posted 07-17-2009 05:20 PM ET (US) Are any gains to be had [by the addition of a jack plate] on my 2003 170 MONTAUK? With a Mercury 90-HP FOURSTROKE mounted two holes up turning a LaserII propeller, the WOT speed is 42- to 44-MPH depending on load. More top end would be nice, but I'm looking for increased midrange speed with same throttle setting.
Tohsgib	posted 07-20-2009 01:48 PM ET (US) They can't hurt but with a 90hp fetching 44 I doubt you will see more than 46. You may be able to spin a larger wheel and ence your midrange might improve. I run one mainly for draft clearence.
Nauti Tauk	posted 07-21-2009 06:57 PM ET (US) Thanks Nick, wasn't sure if I could get a little more out of her or not. May try jack plate over the winter.
chuck21401	posted 07-21-2009 09:16 PM ET (US) Is "two holes up" the factory setting or have you raised the engine? I managed 44mph with my 2008 170...with a light load and trimmed out. I saw 6000rpms running the 20" Laser II prop. I've been thinking about raising my engine a hole or two and trying a different prop, perhaps even a blueprinted prop with increased pitch. With that said I'm not sure how much faster I'd want to go in the 170, at 44mph the ride is pretty loose.
chuck21401	posted 07-21-2009 09:19 PM ET (US) I posted this on another thread but I think it's relavent to this discussion. 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. http://i157.photobucket.com/albums/t55/cwillmarth/17090mercengineheight. jpg
Nauti Tauk	posted 07-22-2009 04:56 PM ET (US) Chuck, I raised the engine two holes. I could go one more but am interested in jack plate addition to get prop in cleaner water and hopefully improve cruise speed.