Just to muddy the water a tad more, the ICOMIA standards for engine rating allow for a +/-10% variation on stated rating, so a 100hp engine could be anything from 90-110hp. Obviously the bigger the engine the wider the absolute variation could be, e.g a 200hp could be 180-220hp. This explains why we get "weak" & "strong" engines.
And of course sometime around the mid 70s they decided to make it vaguely ungnentlemanly to quote crank horsepower rather than prop horsepower (which may explain some of the weird numbers of the time......)
Did Yam (?) not sell a 9.9 to get round some insurance / driving test / other ransdom EU directive thing that used the phrase "10 or more horsepower"?
Quote:
Originally Posted by Pikey Dave
Hmm, you've obviously never been on an Etec powered boat.
Etec? My idea of a high tec 2- stroke is one that mixes its own oil & has electronic stuff to fire the sparks!
Etec? My idea of a high tec 2- stroke is one that mixes its own oil & has electronic stuff to fire the sparks!
Ahh! that's where you're going wrong
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:Don't feed the troll
There's a lot more to speed than pure hp. Propping, weight and the skill of the helm for three. 
BLACK PIG
Piglet
