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Old 01 January 2014, 15:18   #1
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just out of curiousity... 3L inboards economy?

Just out of curiosity guys, all these boats you see towing water skiers around, with 3L inboards, what sort of fuel economy would they have? As bad as my 2 Stroke 90 Yam?

Si
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Old 01 January 2014, 15:29   #2
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I think the inboard would be cheaper to run, more torque at lower revs
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Old 01 January 2014, 15:54   #3
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Just out of curiosity guys, all these boats you see towing water skiers around, with 3L inboards, what sort of fuel economy would they have? As bad as my 2 Stroke 90 Yam?

Si

Just how bad is it?
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Old 01 January 2014, 16:05   #4
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Just how bad is it?
I think its pretty bad, but maybe i am just a cheapskate!
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Old 01 January 2014, 16:25   #5
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you do have the red lever on the front of the carb in the up position if its the auto choke version?? up is auto on.... middle is choke permanently on and down is both off!
correctly propped you should get 0.7 litre per Nautical mile as an average.

check the colour of the spark pugs after a good flat out run with no idling. they should be light brownish,, if the middle cylinder is much different. firstly check the mixture on the carbs,. 2.5 turns out, if no change then take the auto choke wax solenoid out and clean it out as you may have some crap in there which will not help ya mpg
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Old 01 January 2014, 16:29   #6
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in fairness i think mine only has 3 settings - Astern, Neutral and Full ahead....
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Old 01 January 2014, 17:20   #7
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correctly propped you should get 0.7 litre per Nautical mile as an average.
What's your avg cruise speed for that LPN? I have an 85AET and the diff between a 20 - 25 knt cruise (4000-4500) iirc and WOT 5500rpm 34knts is MASSIVE. You can pretty much hear the tank emptying like a bath.
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Old 01 January 2014, 17:38   #8
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i agree, 22 knots taking it easy. but WOT they will drink, the worst i used to get was just over 1 litre per mile given the weight and prop fitted which was a 13/1/2 x 19 pitch
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Old 01 January 2014, 18:08   #9
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What's your avg cruise speed for that LPN? I have an 85AET and the diff between a 20 - 25 knt cruise (4000-4500) iirc and WOT 5500rpm 34knts is MASSIVE. You can pretty much hear the tank emptying like a bath.
I was shocked at the difference between nailing the throttle and cruising on my SR5 with 75AET, same engine as the 90.

At 21kn at 3700rpm I could manage the magical 1l/m, nailing it having fun the fuel would just disappear. Loved that engine though, the more abuse you gave it the more it loved you.
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Old 01 January 2014, 21:39   #10
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Fitted a 135 Mariner on mine last year with a 45 litre fuel tank. The noise of that V6 at full chat means it doesn't last very long but the smile on my face compensates the need to carry extra fuel on board !

Did a 25 mile run last year from Carradale down to Campbeltown and back one morning & emptied the tank from full....!

Taking a couple more jerry cans this year.
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