Rated engine power
How do manufacturers, presently, determine how to rate their engine's crankshaft horsepower? Is the cooling fan engaged and drawing air? Alternator charging? Power steering pump and A/C installed and ...
Forum Discussion
I wonder how much the manufacturer can play with the numbers. I am more familiar with outboard boat motor ratings and know that they have to be within 10% of the rated power, more or less, doesn't matter which way. Today most brands are selling performance more than power and with computer controls the typical outboard makes about 109% of rated power at the prop shaft. It is common to use the same engine to make several different power outputs, frequently with nothing different but the computer programming. I have heard that one engine that is advertised as 225hp at the rated RPM (5500) actually makes about 270hp at 4000RPM. This is within the rules since that is not the rated RPM. This brand like to advertise how strong their acceleration is. It is amazing how people can find ways around the rules.
