I've seen (in the same field) a 70HP tractor handle 5X16"'s (@ relatively low speed and a LOT of ballast) and a 60HP tractor struggle with 3X16"'s.
Some plows are designed as deep draft bottoms, then there's mounted plows, pull type, and semi mounted... Some brands have different contours to the moldboards, which will pull harder/easier than others.
My dad and his brother owned IDENTICAL 4020's back in the '60's. Both dynoed 98hp at same rpm. Both weighted the same. With same EXACT plow (145H Deere 5X16) dads tractor would walk off and leave my uncles tractor. The ONLY difference was the brand of tires on the 2 tractors. That made dads tractor SEEM to have more ability to pull a load.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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