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 Profile: Case VA Series - by Staff. V, VC, VI and VO). Althouh the Case VA looked much like the V, it shared no major components with its predecessor. Except for military units, the production of the Case VA was interrupted in July of 1942 due to World War II. It resumed again in 1944 and continued until 1953. It started up briefly later on in 1953 and continued on a very limited basis until 1956. The VA Series included the following models: VA: Fixed front wheel tread VAC:
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