Well, let's consider an automobile engine in a piece of farm equipment. For example, a K Gleaner combine had a 250 cubic inch Chev 6 engine. That engine, per the owner's manual, required an oil change every 100 hours. That same engine in a car operating under severe conditions as outlined in the owner's manual, would require an oil change every 2500 miles.In the combine, that engine would run at 2400 rpm probably 90 percent of its operating life, producing its rated 75 hp at that rpm. In a car, that engine would turn around the same rpm at 60 mph. It was rated at 145 hp (1970 vintage) at 4800 rpm which it would very seldom see. Operating at a continuous speed in the combine would extend the life of an engine. Cold starts, varying rpm's,different weather conditions seen in a car would detract from the engine's lifespan. At 100,000 miles the car engine would be due for an overhaul. We had a K that ran about 200 hours per year for 35 years, yet the engine showed no sign of oil consumption or blowby. A tractor on the other hand, would be operating at full power for more of the time than would a combine. It would be hard to fairly compare a gas tractor engine to a car engine since the tractor engine is much more heavily built. A diesel engine would usually outlast its gas counterpart in the same model of machine, but cost considerably more when new. Since tractor's operating historys' would be much more variable than an automobiles', comparisons can only be general in nature.
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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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