The 22 horse power Cub Cadet doesn't have the ability to pull or tow as much as the John Deere 850. As others have stated the Cub Cadet figure is the rated horsepower of the engine, the John Deere is from a Nebraska Tractor test demonstrating how much draw bar pull it develops. As for the comment about a Kohler not lasting as long running at 3600 RPMs, at rated RPMs they do okay for engine life, but probably won't run as long as the Deere engine run it its' rated RPMs. When I worked at the golf course we could expect 3,000 to 4,000 hours on a Kohler K series engine IF we took care of them (regular oil changes and cleaned the carbon out of the combustion chamber). Some gas farm tractors didn't run that long, some much more.
Size verses horsepower, again to beat a dead horse some of that is from engines rated a different speeds. Some industrial engines produce their rated power at lower RPMS which is a factor in them being able to run "forever" at the rated speed and power. By forever I mean with out overheating and going into a failure cycle. An example is one of my previous employers had a large pump that was powered by a Ford 4 cylinder "Lima" engine, think 2.3 Pinto, I had another version of that same 2.3 liter engine in a Mustang with a turbo charger and electronic engine control system. The one in the car put out a lot more horsepower, Don't think the car could run for hours on end at 6,000 rpm (where it was rated at 200 HP) the pump motor would run for days at 2,000 rpms. Ford offered 2.3 car four cylinder engines ranging from 88 horsepower to 205. I had a 2.3 in a 1983 Ranger and have a 2.3 in an 1986 Mustang SVO, the Mustang has twice the HP the Ranger did. The Ranger had a 1 barrel carburetor, the Mustang a turbo charger & multi port fuel injection. The Mustang engine would run at 6,000 RPMs plus, I don't think the Ranger engine would pull more than 4,000 RPMS
Variations on the motor will make a difference. Let's look at a 200 cubic inch engine. The Ford Model A was a 200 cubic inch engine and was rated at 40 HP. Ford made a straight six in the 60's it was rated at 120 horsepower (overhead valves and turned faster). GM made a 200 cubic inch V6, the highest horsepower they offered was 170 HP, Honda made a 200 CID V-6 with 200 HP. When I was in High School I had a '63 Pontiac with a 389 V-8 rated at 313 HP, at the same time my Dad drove a truck with a 8V71 Detroit Diesel (568 CID) rated at 318 HP. Wouldn't want to drive a Semi Truck with a 389 Pontiac in it and a Bonneville convertible with an 8V71 Detroit would be a dog.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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