I have a '76 Campion 19' cuddy that would fit nicely in......
Why didn't they offer that hp output in vehicles? That be nice.
they did..... minor history lesson to follow.....
marine engines are rated at the flywheel, and there is essentially no loss through the drive (you have a direct shaft to a gear that turns either a forward or reverse gear), but after 1971 automobile manufacturers started to give HP ratings fully dressed (net instead of gross, which calculated the output of a ‘bare’ engine on a test stand with no accessories, free-flowing exhaust headers (no mufflers), and optimal ignition timing, with a correction factor for standard atmospheric conditions), which results in a loss of 5%-25% depending on accessories (a/c being driven, dyno your truck with an 80 amp alt then with a 160 amp alt and you'll notice a difference because of the power needed to drive the stinkin' thing), contrary to popular belief, factory engine ratings, either net or gross, are ALL measured at the flywheel
that is why a 1971 Mustang with a 302 is rated at 210hp, and a 1972 with the same engine is rated at 140hp, since in all reality the engines make the same power, and your OMC or Mercruiser 302 is 175 to 210 (300cfm, 350cfm, or 500 cfm carb) from the 60's to the 90's, and those are just standard truck engines with marine carbs, w/p, starter, and alternator (that is pretty much what makes any engine a marine engine, the old 2.5 mercruisers were just a chevy "iron horse" 4-banger, the 3.0 is essentially the same engine)
Society of American Engineers (SAE) standards J245 and J1995 measure gross hp rating.
SAE standard J1349 measured net HP, “Net” horsepower ratings are still made with the engine on a test stand, but with stock ignition timing, carburetion, exhaust, and accessories (including a/c pump engaged): in short, a closer approximation of how much power an engine produces as actually installed in the car. This results in a drop in advertised hp, but doesn't change how much the engine actually produces.
in 2005, when the SAE issued standard J2723 to clarify and tighten the existing methodology and require an independent observer be present when the ratings are measured, most American market manufacturers adopted it, and if you look at advertised hp from a 2004 engine and the same in 2006, under these new “SAE-certified output” guidelines, some engines ended up with lower ratings than before, while a few actually increased. In most cases, the engines were not actually altered in any way — the testing methodology had just changed (yet again).
German (and UK) automakers use DIN guidelines for net hp ratings, similar to SAE, but not the same. Italians use CUNA standards, and Japan used to use JIS standards before switching to SAE.
I'm NOT a certified mechanic, just a car guy (also a boat guy) in the know. I did call a buddy for some of the specific information (long term independent mechanic), and he gave me the SAE standard numbers (Tom's one of those guys who can tell you what factory parts to grab from what cars in what years to make a full-race motor).
