Me Again wrote:
Grit dog wrote:
And the eco will get about the same mileage as a BT4 or a 3liter Perkins or any other similar size diesel. So what's your point?
I just can't leave! Watching these discussions is like a train wreck, just gotta see what happens next!
So why are the old two cycle Detroits so fuel hungry? They are noted fuel hogs in boats and on the road. Chris
well, the two cycle detroits came out more than 60 years ago. and being a two cycle, they are burning fuel every revolution rather than every other revolution. and it has a supercharger which takes HP from the engine directly to drive it, and it's an old valve/port combination.
How fuel efficient it was in terms of thermal efficiency compared to other engines of it's day I don't have a clue.
but the most thermally efficient internal combustion engine in the world today is a 2 stroke diesel built by Sultzer for marine use.
Max rpm is only a little over 60 rpm, so very very low frictional losses, and very little wast heat loss. IIRC max torque is near a million ft lbs at less than 60 rpm in the 12 cylinder version.
It is a direct drive to propeller and they just reverse engine rotation to reverse thrust.
