Horspower rating change

[jarob]

Would anyone know in which year did OMC outboards change their HP ratings from the crankshaft to the prop. and approx. what is the difference between to the two?. Thanx

 

[Bear]

Re: Horspower rating change

Around 1980-81 and about 5-7% difference<br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=17;t=022522 <br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=17;t=002073 <br /><br />"I don't think Chrysler/Force ever changed their ratings... "