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 - Adding an Hour Meter - by Steven Gussey. This article tells how I added an electric hour meter to my 1942 Farmall H after rebuilding it. I wanted to keep an accurate maintenance schedule for my rebuilt engine and the implements I use with my tractor, but the H was never available with a tach
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