ORIGINAL: tlojak38
MJD, I'm with you. I started this thread asking about the horsepower of an evolution 61nx, and somehow we got on the 60 nx. Oh and the 61nt is the older model, not the nx. Also, the 60 is a 46 case, bored and stroked pretty much. And, I've decided to go with the 61nx, if I don't like it, ill sell it at our yearly flea market, and buy an is 75. Thanks for all the info........I think
You'll get a bunch of answers if you ask about horsepower - most of them along the lines that most published numbers should be ignored and the real answers lie in reports from the field that tell you how fast it will spin a particular prop. I agree with this premise, although generally the hp figures published are at a certain rpm, and based on the rpm and displacement I would at least consider that a clue about the engine's state of "tune". For example if a .60XYZ was listed at 3.25hp at 20,000 rpm, I wouldn't care about the 3.25 part but would infer that it is in a perky state of tuning and prefers smaller prop sizes. Whereas if the .60XYZ-2 was listed as 1.85hp at 12,000 rpm, I would infer that is designed for and would be happy with large shaft loads. Beyond that, I would search for real numbers for comparison.