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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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