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  Carb 2 Stroke 115 Merc Performance

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Author Topic:   Carb 2 Stroke 115 Merc Performance
PSW posted 04-28-2003 11:27 AM ET (US)   Profile for PSW   Send Email to PSW  
I went to Friday harbour this weekend in the Montauk for the afternoon and thought that since we compare performance stats on new 4 strokes and dfi's so much it might be nice to know what an old technology outboard does to compare to.

For the afternoon I drove at varying speeds in 0 - 2 foot chop. Took some spray from the wind that was rather refreshing. Went a total of 53 miles and burned 15 gallons. Approximately 3.5 miles per gallon. The motor runs great, but obviously sucks on the nipple quite a bit. Extremely happy with the package and if cruded will stick around 25$ maybe even dip below for the summer, I won't worry about my lack of fuel economy too much.

Just for argument what do the 4's get for mileage at 30 mph cruise.

PSW

dogfish2 posted 04-29-2003 02:45 PM ET (US)     Profile for dogfish2  Send Email to dogfish2     
My 115 4s EFI is just being broken in at this time. It is also mounted on a Montauk and, under similar operating conditions, I would estimate at 30 mph, it gets 5.5+/mpg. The EFI's are great!
dogfish2 posted 04-29-2003 03:16 PM ET (US)     Profile for dogfish2  Send Email to dogfish2     
By the way, what is top speed with the Montauk and 115 2s? Thanks.
BOB KEMMLER JR posted 04-29-2003 03:58 PM ET (US)     Profile for BOB KEMMLER JR    
hehe you said nipple
PSW posted 04-29-2003 04:59 PM ET (US)     Profile for PSW  Send Email to PSW     
In optimal conditions on salt water I get 49 mph with GPS. Now that is with everything perfect. Normally 48 is all I see.

PSW

newt posted 04-30-2003 09:34 AM ET (US)     Profile for newt  Send Email to newt     
Wow, that must be a rush...49 mph in a montauk!
Tim Ehlers posted 04-30-2003 11:41 AM ET (US)     Profile for Tim Ehlers  Send Email to Tim Ehlers     
What size prop do you have and what RPM are you doing at 48-49mph? I've got an underpropped (17 inch pitch) Tohatsu 120 and am looking to change. I don't need more speed, although it will be fun, but I do not need to hit 6000 rpm under any load condition either.
dogfish2 posted 04-30-2003 03:06 PM ET (US)     Profile for dogfish2  Send Email to dogfish2     
With the 115 4s on the Montauk, I get 45 mph (GPS) optimum conditions, saltwater, with a 17" prop at WOT (6000 rpm's). Still experimenting, and will try the 18" and 19", which will give a little more speed, but reduce rpm's. Difficult to find the right balance.
PSW posted 04-30-2003 03:34 PM ET (US)     Profile for PSW  Send Email to PSW     
I am running a Michigan Wheel Rapture 19 Pitch. The Merc 115 will turn 5300 with just myself trimmed to the moon and low fuel. Under normal circumstance I pull 5200. What I like most about this setup is that I don't need the high rpm's when cruising. I cruise under 4000 rpm and am in the low 30's for speed.

PSW

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