Mercury, founded in 1939, produces marine and boating-related products such as outboards. An outboard is an engine that is attached to the outside of a boat and resides within its own casing, as opposed to an inboard engine, which is generally located within the hull of the boat. In 2005 Mercury released a number of outboard engines, with certain types developed for varying boat sizes and speeds.
The 2005 Mercury Outboard Bigfoot has a horsepower of 9.9, in essence meaning that it has the power of almost 10 horses, which equates to the ability to pull 326,700 lb. the distance of one foot in one minute. This particular Mercury Bigfoot engine has two cylinders, and is a four-stroke engine, which refers to the strokes that occur during two full crankshaft revolutions. This includes the intake, compression, combustion, and exhaust strokes.
The Bigfoot 9.9 HP's gear ratio is 2.42:1, which refers to the amount of turns that must be made (in this case, 2.42) in order to get a propeller(s) to rotate one full turn. The spline count, or the amount of teeth in a driveshaft that serves the purpose of locking the propeller to the prop shaft, is 10.
The 2005 Mercury Outboard Classic has a horsepower of 15.0, which equates to the ability to pull 495,000 lb. the distance of one foot in one minute . This engine has two cylinders, and is a four-stroke engine.
The Classic 15.0 HP's gear ratio is 2.00:1. The Classic has eight splines within the driveshaft.
The 2005 Mercury Outboard EFI has a horsepower of 60.0, which equates to the ability to pull 1,980,000 lb. the distance of one foot in one minute. This engine has four cylinders, and is a four-stroke engine.
The EFI 15.0 HP's gear ratio is 1.83:1. The EFI has a spline count of 13 within the driveshaft.
