Performance of Diesel and Turbine Fuels in a Military Spark Ignition Engine.
Abstract
Dynamometer studies were conducted at the U.S. Army Fuels and Lubricants Research Laboratory to cursorily investigate the multi-fuel capabilities of the current L-141 military SI engine. The test engine, a reconditioned unit, was equipped with its unmodified stock carburetor and other standard accessories except the PCV system (which was deleted to permit true measurement of carburetted fuel input), the fan, radiator, and thermostat. These cooling system elements were replaced by a tube-in-shell, water-to-water heat exchanger through which the flow of exchange water was controlled. Also, provision was made to induct deionized water into intake manifold through the access hole normally occupied by the PCV discharge fitting, in order to suppress knock. These studies involved the use of four basic fuels: JP-4 (MIL-T-5624-H), Jet-A (ASTM D-1655), DF-2 (VV-F-800), and for reference purposes, unleaded VV-G-001690 Special Grade gasoline. Analyses of exhaust emissions under maximum knock-free output conditions at both normal spark without water induction and at optimum spark with water indicated that, at any given speed, the NO and NO usb x from the neat JP-4, 50 percent Jet-A blend, 50 percent DF-2 blend, and 20 percent DF-2 in JP-4 were less at optimum spark with water than the NO and NO sub x from neat reference gasoline at normal WOT conditions. In general, the CO from the test fuels was less at optimum spark with water then at normal spark without water, but at each speed CO was less with all test fuels than with neat reference fuel.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1975
- Accession Number
- ADA013423
Entities
People
- J. V. Moffitt
- Sidney J. Lestz
Organizations
- Southwest Research Institute