Interesting discussion. Remember a couple of things though: If you had a successful engine, it cost $ to engineer and change production. Tractors didn't have self starters, generators or lights well into the late 30s because the farmer, or farm economy, wouldn't pay for them. Flatheads are simple and have less parts than an OHV, hence a cheaper engine. OHV engines can make more power, but only when combined with the higher compression you can achieve with them. There was no high octane fuel, until Eythel became available around WW II and even then folks bellyached about the price difference of a couple of cents. The lower priced automobiles, for the most part, stayed the same for years because change raised costs. Styling became yearly in the 30s, and folks paid for it. Tractors were not stylish so there had be a reason for change, and it usually was hopeless obsolescence. It wasn't until the early 50s with live ptos, hydaulics, and the pressure to provide more power to quickly work more and more land, that the industry seemed to explode
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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