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It seems that most mfgs have a standard 115 hp motor and a suped up version of the same model. What are the hp differences between the two models? Any first hand experience?
All the engine manufacturers have pretty detailed information on all their products which is frequently updated. Keep in mind that manufacturers HP ratings may be off by as much as 10%. If you want the most accurate information it should be available from the EPA.
If weight is a factor in comparison make sure you include accessories you may want or need that may not be included in the weights for the engine. I believe bare engine weights without lubricants are normally used on the web sites.
Mercury uses the "ProXS" designation, and Evinrude use "H.O.". These engines do indeed make more HP than the standard versions, and have been sold into the performance and bass boat industry for years. This has been done by Mercury for over 30 years, and takes advantage of the 10% HP rule, in this case to the high side.
So a Mercury 115 ProXS is putting out about 125 HP at the prop. A Mercury 250 ProXS puts out around 275 true HP.
An Evinrude 90 H.O. (V-4) is probably around 105HP. The Evinrude 115 HO had to be discontinued because of inabillity to meet pollution requirements or some other problem.
