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Author Topic:   Montauk /w OMC 90 SPL performance?
Conrad posted 08-09-2002 10:14 AM ET (US)   Profile for Conrad   Send Email to Conrad  
Does anyone have any performance numbers for a Montauk wih a Johnson 90 SPL (GPH, MPG, Top Speed, Feul Consumption/Speed at RPM)?

The only number I have is 43 MPH on GPS (my boat has no guages).


Cpt Quint posted 08-09-2002 11:30 AM ET (US)     Profile for Cpt Quint  Send Email to Cpt Quint     
Thats right at top speed on WOT. Should be in 5.8-6krpm range.
Bigshot posted 08-09-2002 12:54 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
That engine redlines at 5500 being a SPL.
acassidy posted 08-09-2002 07:40 PM ET (US)     Profile for acassidy  Send Email to acassidy     
What pitch prop do you use the get the 43 MPH?
Conrad posted 08-11-2002 06:33 AM ET (US)     Profile for Conrad  Send Email to Conrad     
I think it is a 17, stainless steel. This is my first boat and I have had it for 5 about years and still don't know much about props. I will check when the sun comes up.


acassidy posted 08-11-2002 07:19 PM ET (US)     Profile for acassidy  Send Email to acassidy     
The reason that I ask is because I have a Montauk with 100 GT Johnson, 1991 model. I have a 17" pitch prop. My speedo does not work at all, but I get around 5200 RPM with aluminum 17 prop. Stainless steel 17" prop gives me about 5300 RPM. I always wondered how fast I might be going. Gas mileage? Well, it is a gas hog. It is nothing to burn 12 gallons of fuel running around. I need a larger tank. I think that the RPM range is 4500-5500. I do love this boat and setup. Later.. Archie
Conrad posted 08-12-2002 10:20 AM ET (US)     Profile for Conrad  Send Email to Conrad     
Sorry, I feel back asleep and forgot to check the pitch of the prop. But I am 90% sure that it is a 17. I did 43 mph (GPS) in the boat by myself with a light load (gas and equiptment) on smooth conditions with optimum trim.

I started this thread because I was curious about gas consumption. I am taking a 70-80 mile round trip and am trying to estimate how much fuel I will need (I think I have plenty). I have a 20+ gas tank and two 6 gallon spares (if I need them).

What I plan to do is bring my handhelp GPS to take note of the mileage and speed. After running about 80 miles, I should have a good idea of how much fuel I am burning.


TightPenny posted 08-12-2002 12:31 PM ET (US)     Profile for TightPenny  Send Email to TightPenny     
2000 Montauk, 2001 90hp Johnson.

I am averaging about 4gph and about 3.8 to 4.0 NMPG on my regular fishing cruises. I normally run in the 3500-4000 RPM range hitting full throttle for the occasional need for speed. This is Barnegat BAy and Atlantic Ocean running.

I am running a 17" pitch Michigan Wheel Rapture Prop, and the boat is normally loaded reasonably heavily with fishing gear, 28 gallon fuel tank and a 285 pound captain.

TightPenny posted 08-12-2002 12:33 PM ET (US)     Profile for TightPenny  Send Email to TightPenny     
Oh Yeah, WOT gets me about 37 Knots, trimmed out and only me on board
Wild Turkey posted 08-12-2002 04:10 PM ET (US)     Profile for Wild Turkey  Send Email to Wild Turkey     
1989 Montauk, 1989 90hp Evinrude
19 pitch SS Michigan Rapture prop
CMC manual setback plate, light load, trimmed out: 43.2 mph (GPS) @ 5600 rpm (WOT)

approx. 3.1 NMPG @ 4000 rpm (cruise)

triblet posted 08-12-2002 11:49 PM ET (US)     Profile for triblet  Send Email to triblet     
97ish Montauk, 96ish 90HP two-stroke Evinrude, 17" AL prop,
41 MPH top speed (just me and a little gas).
Conrad, you are getting 43 MPH. It ain't
broke, don't fix it.


kamml posted 08-13-2002 07:46 PM ET (US)     Profile for kamml  Send Email to kamml     
77 Montauk, 02 90hp Merc, 17" Al,3 on board, 14 gal gas, smooth river, 39 mph gps, 5400rpm. Sounds like you got a winner! Ken
frank_king posted 08-27-2002 10:08 PM ET (US)     Profile for frank_king  Send Email to frank_king     
i know this is not a v-4 but i have to tell you what i'm getting....

i have an 81 montauk with a 78 model johnson 75hp that i've built myself and done some fine tunning on the inside of the block and pistons. i get about 6 1/2 mpg with a 17" omc ss prop with light load.

i am in the process of rebuilding a 97 model 60 degree omc v-4. it is looped charged i hope it will get better gas mileage than the other crossflow v-4 i once had on the boat. with the crossflow v-4 i got about 4 mpg. much like the other post i see here

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