It appears you have already made up your mid on the matter and no amount of evidence will change that. Its not about the most torque or horsepower. The question is at what rpm the peak torque is at. A gas reaches peak torque at a high rpm. The diesel is normaly at at much lower rpm. The peak torque at a lower rpm makes the torque more usable. If you lug the rpm below the peak torque, the engine will continue to pull down. You mentioned the Ford 172 as an example. I will tell you that the diesel, with a lower horsepower, will outpull a gas motored one. I have had both. As an engineer I have studied the torque/horsepower curves on a lot of engines. That is where you get the real story. The Dodge Hemi truck has the same hp as my diesel. Hook them bumper tp bumper an see who wins in a pulloff. Not to mention fuel economy and engine life.
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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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