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Old 19 March 2007, 09:08   #1
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Is my 150 etec using to much fuel

Any ideas on how much fuel an evinrude 150 etec should use?

I went to the Medina Meeting on Saturday from the Itchen I reckon I did 10 miles at low speed an 30 miles at "high" speed. I think I used about 40 litres of fuel. I had read somewhere that 1 litre per mile is about right but I assume that is high speed motoring not river tootling. Plus I thought the etec was supposed to be very fuel efficient.

Any etec owners have figures for their engines?
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Old 19 March 2007, 09:51   #2
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Etec 150 fuel usage

Hi Peter,

I can happily say that my Etec on the Rib-X 650 eXpert uses between 18 and 22 litres an hour when running at about 3000 revs and 25 knots.

I can happily go across to Cowes and back on under 25 litres, unless if i am being completely wicked with speeds!

I have calibrated my fuel flow meter, and i do tend to leave my fuel tank completely full, hence how i can come up with these figures and verify them.
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Old 19 March 2007, 12:13   #3
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ok i know its a completly different engine but i get exactly 1 nautical mile per litre and 25 knots in my old oil burner,!!
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Old 19 March 2007, 12:42   #4
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I used to get 1.75ish miles to a litre at around 4000rpm and 30 knots with my 150 ficht. 1mile to a litre is about right for my 200 mariner carb model that replaced the ficht but that would be flat out 52 knots!
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Old 19 March 2007, 13:47   #5
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Quote:
Originally Posted by Peter J View Post
Any ideas on how much fuel an evinrude 150 etec should use?

I went to the Medina Meeting on Saturday from the Itchen I reckon I did 10 miles at low speed an 30 miles at "high" speed. I think I used about 40 litres of fuel. I had read somewhere that 1 litre per mile is about right but I assume that is high speed motoring not river tootling. Plus I thought the etec was supposed to be very fuel efficient.

Any etec owners have figures for their engines?

Hi Peter,

i would not be surprised if that was about right for the run last Saturday. the trip over to cowes, was not particularly quick, but if you were anything like me, you were on and off of the throttle, probably not getting onto the plane much, and hence not being particularly efficient.
It's quite amazing how much that sort of trip can increase fuel consumption.

That said, I stand to be corrected by those more experienced, especially those with a newer tech outboard and fuel flow meters.

Hope this helps a bit.

Neil
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Old 19 March 2007, 14:06   #6
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On saturday I used 42 Litres to do 45 NM giving a little over 1 NM per litre. This included about 13 Nm at 6 knots. Usual average consumption is 1.3 Nm per litre.
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Old 19 March 2007, 14:57   #7
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Blimey, I need a new engine. 1.3 litres per mile is about right for me... and I just worked out that is nearly 70% more than 1.3 miles per litre

I want an Etec
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Old 19 March 2007, 15:17   #8
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At 40 knots (about 4000 rpm), I average about 60litres for both engines

So this is about 1.3l/nm

At 50+ knots (5000+rpm) i average about 115-120 litres for both engines.
About 2l/nm


Until I started working it out, I thought my fuel consumption with the new engines was quite high, but in fact, at the same speed as my old engines did at maximum (just over 40 knots), I was using about 80l/h... so its more efficient
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Old 19 March 2007, 15:47   #9
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Blimey, I need a new engine. 1.3 litres per mile is about right for me... and I just worked out that is nearly 70% more than 1.3 miles per litre

I want an Etec
Stephen,

Don't want to depress you even more but we're talkin NMs here. Thats 1.2 normal miles to the NM. I don't know how to work it out Miles to litres but its got to be near 1.5 miles to the litre.
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Old 20 March 2007, 04:45   #10
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Originally Posted by Peter J View Post
I had read somewhere that 1 litre per mile is about right but I assume that is high speed motoring not river tootling. Plus I thought the etec was supposed to be very fuel efficient.

Any etec owners have figures for their engines?
I avg about 1.2 ltr/km. for out 200 big block cruising.

Also at slow speeds 7 to 10 kns you might find that it drinks a fair bit more ,as if like mine, the boat is in the middle of getting out of the hole and has alot or resistance.

I go from .6 ltr/km at 6 kn to 2.5 ltr/km apx at 9 kn

The engine also normally changes from a lean mix to normal mix around 1800/2000 revs. At these revs you might get a bit of coffing if kept there.

my 2c for what its worth which at todays exchange rate is apx 1p


paul
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Old 20 March 2007, 05:28   #11
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Stephen,

Don't want to depress you even more but we're talkin NMs here. Thats 1.2 normal miles to the NM. I don't know how to work it out Miles to litres but its got to be near 1.5 miles to the litre.
Sorry, so was I - didn't say NM. So I am still the same amount depressed

1.1515 recurring
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Old 20 March 2007, 07:57   #12
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Thanks

Thanks for the figures guys. I think I am just as confused as before though.

Quote:
Originally Posted by UNIwatersports View Post
Hi Peter,

I can happily say that my Etec on the Rib-X 650 eXpert uses between 18 and 22 litres an hour when running at about 3000 revs and 25 knots.

I can happily go across to Cowes and back on under 25 litres, unless if i am being completely wicked with speeds!

I have calibrated my fuel flow meter, and i do tend to leave my fuel tank completely full, hence how i can come up with these figures and verify them.
Hmmmm...... On that basis I should have used about 30 ltrs not over 40 ltrs. It would be nice if the fuel flow meter on the engine actually worked!
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Old 21 March 2007, 08:40   #13
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Quote:
Originally Posted by Peter J View Post
Thanks for the figures guys. I think I am just as confused as before though.



Hmmmm...... On that basis I should have used about 30 ltrs not over 40 ltrs. It would be nice if the fuel flow meter on the engine actually worked!
Same boat? Same prop? Same load? Those are important variables to get a valid comparison. But if you're concerned, take the boat back to the Evinrude dealer and have them check it over...
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Old 31 March 2007, 16:15   #14
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Went out Thurs did 30 nm which included northney marina out over the bar and back used 41lts that was a full tank before we left and a refill on the way home
so i am pleased.
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Old 31 March 2007, 16:42   #15
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As I continuously monitor my fuel usage I would like to add that my MPG has increased somewhat recently. Its now 1.1 NM per litre. I have noticed that I'm tending to using higher revs later. I used to keep it near 4000 rpm but now running a lot closer to 5000 rpm.

Next run I'm going to keep it nearer 4000 and see how that goes with regards overall speed and fuel usage.
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