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Montauk Speed
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| scottmcx |
Posted on 09/10/10 - 7:20 PM
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I am the original owner of a 1989 Montauk 17 rated for 100-HP that's been running with a 1990 Yamaha 130hp since new 20 years ago. It runs over 50-MPH and will deep start 240-lb slalom skier with three adults in the boat on a 21x13.25 original SS Yammy prop. The Yamaha is about at end of life and, since no manufacturer has a 130 at comparable weight, I've ordered an E-TEC 130. The MONTAUK has always been dry stacked. I took it to the landing and pulled it out to wait on the new Evinrude to arrive. The dealer is supposed to call me in a few days for install.
GPS clocked the MONTAUK at 58-MPH running with the tide and 55-MPH against tide at 5,600-RPM for her last run on the Yamaha before the transplant. The original SS Yamaha propeller is 21-inch pitch. I have a 23-inch chopper from an old Allison/Merc setup I used to have that has pushes it just over 60 without hub exhaust, averaged up and down current with GPS. I am hoping to get the same performance from the E-Tec.
I'll keep you posted as this adventure progresses.
Edited by scottmcx on 09/10/10 - 7:28 PM |
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| huntingturkey2 |
Posted on 09/14/10 - 7:46 PM
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I was the original poster of the GT 100 pushing the montauk 17 at 58 mph. There was definitely wind that day and that was definitely with the wind- but it also went over 50 mph into the wind as well. Sounds like this gentleman has gone pretty fast too in his Montauk. I am only a 165 lb. guy- and I was also the only one in the boat- and it was recorded on GPS- so even if it was "over the ground" speed- it was still pretty fast- and the rpm's were at 5600. Not sure why we have so many critics, unbelievers and otherwise out there.
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| Fishmore |
Posted on 09/14/10 - 9:32 PM
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Huntingturkey,
There are people who are doubting your claim because they have run performance figures on your hull and engine and the numbers did not add up.
Using Crouch's planing hull calculator a Montauk style hull needs 130 HP to attain 58 mph if the boat had a total weight of 1500lbs. Given a dry bare hull of 900lbs and 300lbs for the motor and 165 lbs for you, 50lbs for the battery, 50lbs for the fuel and 50lbs pound for other gear (seat, console etc...) you might be at 1500lbs. If you went to 1600lbs you would lose 1 mph calculated. By the way if I change the HP to 100 the MPH drops to 50.
Using your motor RPM of 5600 RPM, 2.00:1 gear ratio, estimated slip of 6%, to attain 57 mph you would need a 23 pitch prop. A 21 pitch prop would hit 52 mph.
I am not saying you did not see what you saw. I am just explaining why others may not believe you. It is purely that the numbers do not support the result. Sounds like you have a very light hull or a very high pitch prop, or an inaccurate GPS or a very hot motor or maybe some combination of the above. In any case it has nothing to do with you as a person.
Regards.
Edited by Fishmore on 09/15/10 - 8:47 AM |
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| bmw90w |
Posted on 09/15/10 - 11:49 AM
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I would be careful with mounting a motor which is over what is rated. I am surprised a dealer would even install that for you. If you get pulled over by the coast guard, there would be big trouble so be careful.
1984 Montauk |
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| Gamalot |
Posted on 09/16/10 - 4:54 AM
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bmw90w wrote:
I would be careful with mounting a motor which is over what is rated. I am surprised a dealer would even install that for you. If you get pulled over by the coast guard, there would be big trouble so be careful.
I thought this seemed rather odd with a boat rated for 100 HP and a 130 on it. I always wondered what, if any, penalties there might be. I have also envisioned the much over rated motor tearing the transom right off the boat on a hole shot.
Correct me if I am wrong here but I don't think the design of the Montauk hull was ever meant for pure break neck speed and right around 40 MPH seems like about enough.
I'll be fine with my Montauk doing 60 behind my truck!
Gary
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| bmw90w |
Posted on 09/16/10 - 12:02 PM
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Getting back to my original problem, I realized my tach was not set right. It was set on 20 poles, and I believe it needs to beset on 12 poles. I still get the same speed, but now I can see where my rpms are. I will let you guys know the results hopefully this weekend.
1984 Montauk |
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| scottmcx |
Posted on 09/16/10 - 8:15 PM
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As a note, my 17' Montauk has had a 130hp Yamaha 2 stroke on it for over 20 years.
Needless to say, I've been "checked" by both DNR and Coast Guard at least twice a year. No "official" has ever said a word about the horsepower. My new 130hp Etec is being rigged as we speak. I will probably have it Saturday or Monday.
I'll post as soon as I have new performance results.
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| bmw90w |
Posted on 09/21/10 - 3:29 AM
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Well bad news unfortunately. I went out after setting my tach right trying to get the rpm readings. While at full speed the motor shuts down. I have no idea why, and I limp back to the dock. When I take off the cowling, my heart sinks. I was sure I added oil before I left, but I didn't. Moral of the story is always double check your oil!! I threw a rod and my mercury is done.
On a side note, if any of you have a late model 90hp you know of let me know!!
1984 Montauk |
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| scottmcx |
Posted on 09/24/10 - 6:31 PM
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OK..130HP E-tec 1989 Montauk BW now installed. One day (4 hours) of shake down to get past the double oil "break in" and then, today, ran it with GPS. Air Temp 85F, cooler by 8 degrees than the last run on the 1990 130Hp Yamaha. Winds 15mph.
21"x13 Michigan Prop. 53mph against the incoming tide and 56 with the tide. The wind was against the down tide run.
RPM was only 5400 trimed out to the absolute ragged edge. Tech at the dealer says it should pick up a few revs. The Michigan clearly has more blade surface than my old 21" which had been reworked for minor dings over the years and cupped.
This weekend will try pulling deep water starts with 230lb slalom skiier. I have to get my 23" Chopper set up for the Evinrude, probably a week before I get that done.
BTW...at idle this thing is VERY quite and smooth. The loudest noise is the water from the pump hitting the river when out of gear idling. When the "Tuned Exhaust" valve switches on it feels like you've downshifted into "passing" gear.
Will keep you posted.
Edited by scottmcx on 09/24/10 - 6:39 PM |
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| scottmcx |
Posted on 10/16/10 - 9:47 AM
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Test video running 21" Michigan Prop. 55mph Max, Temp 63F Will be testing addtional props soon.
http://www.youtube.com/watch?v=cWXiHQ0pYoo
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| msd58 |
Posted on 10/17/10 - 4:29 AM
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Saw video. That's movin'
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| DownTonset |
Posted on 11/30/10 - 4:13 AM
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scottmcx wrote:
As a note, my 17' Montauk has had a 130hp Yamaha 2 stroke on it for over 20 years.
Needless to say, I've been "checked" by both DNR and Coast Guard at least twice a year. No "official" has ever said a word about the horsepower.
It depends on where you live, I guess. As far as I know, the CG does not specifically prohibit exceeding the max. hp recommended by the manufacturer, but some states and local jurisdictions do have laws against it. You could also be subject to general "unsafe boating practices" laws, if the Coasties or the local Harbor Master really want to bust your chops. Insurance companies don't like overpowering much, either, and they will up your premium substantially if you run an engine that's "too big", if they write you a policy at all.
Of course, you can always use a little subterfuge to keep the LEOs off your back. For years, a neighbor of mine ran an Evinrude "90" with 140 guts inside on his Montauk, and I've known others who have simply switched engine covers or decals to hide what they're running.
Edited by DownTonset on 11/30/10 - 4:15 AM
1984 Montauk--1984 Evinrude 90 |
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| Ralph Iorio |
Posted on 12/02/10 - 4:17 PM
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Finally got my prop/speed/rpm headaches resolved with an old SST 13 3/4 x 17. Swapped it for the old 13 x 19 aluminum which only gave me 4600 WOT. I now gwt 5400 WOT and an average SOG of 39.4 mph (I only ever move at 21 mph @ 3000rpm so speed doesn't matter to me. In the testing process my drive shaft snapped, right at the point it enters the housing. My mchanic convinced me to go with a brand new lower unit available from an outfit in FL for $895 (with a 3 year warranty) and he's charging $150 for the swap. It comes to just a bit more than if I would have replaced the shaft, and the new one has a state of the art two=piece shaft. All I can say is thank goodness it didn't happen in one of my usual haunts which would have been over a wreck about 10 miles out in the Gulf...Ralph
PS - regarding overpowering your boat...it's like anything else that's not kosher (cheating)...great until something happens...then all heck breaks loose...ask Tiger, or one of the bass pros who was suspended for life trying for covering a higher powered engine with a hood from a lower rated outboard...these things have a way of catching up with you...be careful.
1989 Montauk 17 w 1989 Johnson 90 |
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| Van |
Posted on 12/05/10 - 5:32 PM
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1975 Montauk( old hull currituck converted) 1988 Johnson 88 ( a 90 without oil injection), 19" SST II, very light and trimmed all the way out-50 mph. Sea level, 70 degrees F This motor seemed slightly more powerful than other 90 JohnRudes. Just bought 1990 Montauk, 2000 Johnson 90 (not ficht) 19" SST II that runs 46 mph, freshwater 600' MSL, 2 adults, not much gas, with a cavitation plate mounted whale tale dragging in the water at 60 degrees F. I have been in numerous 17's and a good 90 mounted and propped right should run mid to upper 40s trimmed out. just my 2 cents worth
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| Ralph Iorio |
Posted on 12/06/10 - 12:38 PM
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Van...I agree with you on the speed expectations but my Montauk just wont get there...40 is tops. I do carry dual HD batteries plus 24 gallons fuel, 300 ft. anchor line, tool box, full ice chest and usually almost a dozen rods or half dozen dive tanks plus gear. That may have something to do with it. In any case, matters not, 20 - 25 mph at 3000 - 3500 rpm is all I ever need or can use with the usual chop I'm in.
1989 Montauk 17 w 1989 Johnson 90 |
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