I was just curious.* I have never seen a naturally aspirated version of the venerable Cummins straight 6(BT) 5.9 liter engine.* The lowest output I have seen by this engine is 210hp and it is still force fed.** Does a naturally aspirated version of this engine exist and, if so, how much power does it put out?
Frequently engines come in a series from a natural to dual turbos with 3 or 4 products from the same block.
Looking at the Mfg spec for 24/7 frequently show little difference in long term power output ,
BUT the short time power output may be much ! higher.
The "best" deal is usually the most basic engine , sans turbo , if trawler speeds are contemplated.
If you have the boats displacement in pounds , divide by 2240 , for weight in long tons.
1 hp per ton moves you at cruise, 3hp per ton will punch into most conditions anyone is likely to see, 5hp per ton is for plaining .or "Semi Displacement" boats that will use their less efficient hull shape at higher speeds to semi stabelize the hull.
Each 15 to 17 hp burned will cost 1 gallon (US) per