1896 Outrage 18/Evinrude 150 hp fuel mileage?

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Author Topic:   1896 Outrage 18/Evinrude 150 hp fuel mileage?

Outrage2795 posted 04-21-2005 08:12 PM ET (US)
I picked up a used 1986 Outrage 18 with a 1986 150 hp Evinrude carbed 2 stroke a year ago. The engine was professionally rebuilt recently and has good, even compression. The prop is stainless steel, in good condition, with a 19 pitch if I remember correctly. My question is would anyone happen to have a table showing RPM, MPH, GPH, and fuel mileage for this particular combination? If not, would anyone know the RPM for best gas mileage?
Thanks!
jimh posted 04-21-2005 08:45 PM ET (US)
If you look at many reports of outboard motor/boat/propeller performance, the best fuel economy always seems to be around 3500 RPM. I am not kidding.
Buckda posted 04-21-2005 09:27 PM ET (US)
With the same pitch prop, and a Merc 150, I get about 3 MPG on good smooth days, running between 3200 and 3600 RPM.
mfrymier posted 04-22-2005 11:40 AM ET (US)
Ditto Buckda's comment on my '81 w/ '90 Merc 150 Black Max, aluminum 4 blade prop. I may get .01 mpg less when I install the awesome stern light he sold me....extra windage!
LHG posted 04-22-2005 12:58 PM ET (US)
Check out JimH's prop reports on his 22 Revenge. Those Mercury 4-bladed aluminum props are terrible performers. Try a Vensura or Rev-4 instead. A Laser II is also a great prop for an 18 with a 150 on it.
kamie posted 04-22-2005 04:13 PM ET (US)
Prop: Laser II 19 pitch
RPM MPH
3400 25
3800 30
4000 32
5300 (WOT) 42
That was from some tests I did last year. No MPG figures as I didn't have anyway to measure fuel. I would actually expect you to do better at WOT, the t-top takes off a few mph and I have one cylinder that is low.
The 150hp that I have should top out at 5500-5600 so I was low.
Outrage2795 posted 04-22-2005 08:12 PM ET (US)
Thanks for the replies. Unfortunately I have a problem with my voltage regulator/rectifier. It cuts out at higher RPMs so I lose my tach reading. Once I fix that I will run some tests to determine MPG and best RPM for fuel mileage. Any more information out there?
macfam posted 04-24-2005 07:30 PM ET (US)
Outrage2795,
With a 150hp conventional carbed 2-stroke, you can go to the bank with these numbers:
At 3500-3750m rpm (easy cruise), 7-8 gal/hour.
Wide open, 15 gal/hour.
Approx: 3 mpg at cruise, 2mpg wide open.
LHG posted 04-25-2005 06:06 PM ET (US)
According to Peter's post in the single vs twin fuel mileage thread, he idicated his similarly powered 18 got 4 mpg.

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Author	Topic: 1896 Outrage 18/Evinrude 150 hp fuel mileage?
Outrage2795	posted 04-21-2005 08:12 PM ET (US) I picked up a used 1986 Outrage 18 with a 1986 150 hp Evinrude carbed 2 stroke a year ago. The engine was professionally rebuilt recently and has good, even compression. The prop is stainless steel, in good condition, with a 19 pitch if I remember correctly. My question is would anyone happen to have a table showing RPM, MPH, GPH, and fuel mileage for this particular combination? If not, would anyone know the RPM for best gas mileage? Thanks!
jimh	posted 04-21-2005 08:45 PM ET (US) If you look at many reports of outboard motor/boat/propeller performance, the best fuel economy always seems to be around 3500 RPM. I am not kidding.
Buckda	posted 04-21-2005 09:27 PM ET (US) With the same pitch prop, and a Merc 150, I get about 3 MPG on good smooth days, running between 3200 and 3600 RPM.
mfrymier	posted 04-22-2005 11:40 AM ET (US) Ditto Buckda's comment on my '81 w/ '90 Merc 150 Black Max, aluminum 4 blade prop. I may get .01 mpg less when I install the awesome stern light he sold me....extra windage!
LHG	posted 04-22-2005 12:58 PM ET (US) Check out JimH's prop reports on his 22 Revenge. Those Mercury 4-bladed aluminum props are terrible performers. Try a Vensura or Rev-4 instead. A Laser II is also a great prop for an 18 with a 150 on it.
kamie	posted 04-22-2005 04:13 PM ET (US) Prop: Laser II 19 pitch RPM MPH 3400 25 3800 30 4000 32 5300 (WOT) 42 That was from some tests I did last year. No MPG figures as I didn't have anyway to measure fuel. I would actually expect you to do better at WOT, the t-top takes off a few mph and I have one cylinder that is low. The 150hp that I have should top out at 5500-5600 so I was low.
Outrage2795	posted 04-22-2005 08:12 PM ET (US) Thanks for the replies. Unfortunately I have a problem with my voltage regulator/rectifier. It cuts out at higher RPMs so I lose my tach reading. Once I fix that I will run some tests to determine MPG and best RPM for fuel mileage. Any more information out there?
macfam	posted 04-24-2005 07:30 PM ET (US) Outrage2795, With a 150hp conventional carbed 2-stroke, you can go to the bank with these numbers: At 3500-3750m rpm (easy cruise), 7-8 gal/hour. Wide open, 15 gal/hour. Approx: 3 mpg at cruise, 2mpg wide open.
LHG	posted 04-25-2005 06:06 PM ET (US) According to Peter's post in the single vs twin fuel mileage thread, he idicated his similarly powered 18 got 4 mpg.