Horsepower is a calculated value: The engine is tested on a dynamometer typically at WOT (Wide Open Throttle) under load. The load is adjusted to hold the engine at various RPM points through out its operating range. The engine torque output is measured at each RPM point.
HP is calculated from the following equation: HP = (Torque x RPM) / 5252. Where torque is in ft-lbs, the constant 5252 is used to make the units work out. Note, from the formula, two engines can produce the same HP but have different torque outputs depending on the RPM range they operate within.
HP is a measure of the work an engine can do per unit of time. The application is the responsibility of the user! An 8N engine in a lawn mower will not pull a 2 bottom plow since the mower is much to light weight. A 20 HP lawn mower engine in a 8N will pull a 2 bottow plow if the gearing is revised to allow the engine to operate within its RPM range to develop the 20 HP.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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