Unless pouring out black smoke and fire from the exhaust which indicates excessive overfueling, diesel combustion always has excess air. Can't run an diesel very long with that much overfueling so they added propane which burns cleaner to utilize the excess air and produce power. Does cause an increase in peak cylinder pressures but not near what would happen by overfueling. Twenty or so years ago we had a project funded by the government used a very small pilot diesel fuel injection to start the combustion and used natural gas to generate the remainder of the power. Pretty much was a standard diesel engine with added electronics to control the pilot injection and natural gas injection in the inlet manifold. Worked Ok and ran quite a few endurance hours, but when project funds ran out it never went any further. Believe Red Rooster was the big aftermarket for adding propane to diesels.
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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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