Originally Posted by scallywag
I'm sure i may be corrected however I was always told that older engines were rated as H.P at the prop were as newer engines were rated at the head. Therfore older engines gave a truer figure without tranmission losses.
in the mid 80's Merc's changed from HP at flywheel to HP at prop,
if you check thro the old engines you will see
50hp became 45hp
80hp became 75hp
100hp became 90hp ( i think )
and so on
I could be wrong but think OMC were always at prop ??
my 1976/7 Merc 500 50hp became 45 hp in 1986