We've got a total of 6 detroits on the 2 boats i work on at home, 3 12-71ti's, 2 6v-71's, and a 4-71 for a generator. They sure are some workhorses, all of them on their umptienth rebuilt and most of them still going strong. The 4-71 has god knows how many hours on it, it just keeps going strong. I love the old detroits, but they are heavy, loud, and thirsty, im sure thats why people get away from them, just better options out there.
rgr that. The reason this question occured to me was just that. I mean how much better are they? Whats the difference in fuel burn for the given power? I remember our "tank engine" being a loud old bastard that loved its oil. The yanmar that went in was a little quieter and a little better on fuel and was always clean enough to eat off of. But at the time I think we were paying $1.72 for fuel oil so I didnt really care. We carried 300+/- gallons of fuel and fished fairly local anyway.
Seems like the question got off topic a bit but we wouldnt even be able to go through hells gate on a moving tide with an 8knot boat for example. I think a 15-20 knot cruise is a comfortable speed.
Seeing how many lower cost gas and 100-200hp diesels are for sale theese days that just endlessly stay up for sale it got me thinking was all.