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Old 01-05-2021, 01:31 PM   #48
jleonard
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Join Date: Jun 2008
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Quote:
Originally Posted by Nomad Willy View Post
Face it .. if you have an engine twice as big as it needs to be there’s no way you’re going to make it efficient. All you need to know is that the slower you run it the less fuel it will burn.
Ummmm not necessarily all true and let me explain.
I had an original 1978 Mainship model 1 with the oem Perkins T6.354 diesel rated at 160 HP.
After owning it for close to 10 years I repowered it with a Cummins 6BTA at 270 HP.

It was way more efficient with the Cummins engine if I cruised at the same speed as I did with the Perkins, about 8 to 8.5 knots. That is going by nautical miles per gallon.
If I cruised at about 11.5 knots it got the same MPG as the Perkins did at 8 knots.
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Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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