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MATCHING studies of three turboprop engine configurations were made for flight conditions from sea-level static to 600 mph at 40,000 ft. It is concluded that turbine frontal area, stress, and pressure ratio requirements made exhaust-area adjustment desirable. Sfc depended primarily upon flight conditions and turbine temperature, with lowest sfc occurring at highest turbine temperature, flight velocity, and altitude. Free turbines restricted turbine temperature range and produced critical turbine requirements. Increasing a two-spool engine's outer-compressor pressure ratio increased turbine temperature range and made turbine requirements less critical.

APPLICATION of injection equipment, especially designed for gasoline, to the stock V-8 passenger-car engine is described here. The port-injection system tested basically consists of an injection pump driven at half crankshaft speed, a mixture control governing the pump setting, a motor-driven fuel supply pump maintaining fuel pressures above the vapor pressure of gasoline, and the associated nozzles and fuel filter. Advantages of converting a stock carbureted engine to gasoline injection include 10% greater full-throttle horsepower output, a minimum decrease of 500 rpm in torque peak position, 5–15% more miles per gallon, and the use of fuels having higher vapor pressures and end points.

A RADIOACTIVE tracer method for measuring connecting-rod bearing wear as it occurs is presented. A bearing wear mechanism is proposed which is substantiated by wear measurements using the above technique. Effects of operating variables and lubricating oils are discussed.

A750-HP aircooled diesel engine has been successfully developed with the primary purpose of reducing the fuel consumption of gasoline-engined-powered combat vehicles by approximately 40%. The new powerplant is characterized by low fuel consumption, light weight, and high compactness. The basic features of the engine are: 5.75-in. bore × 5.75-in. stroke, 1790-cu in. displacement, compression ignition, 4-stroke cycle, direct-injection system, 90-deg Vee, 12-cyl, aircooled, exhaust turbocharged. Rated output is 750 hp at 2400 rpm with a potential output increase up to 850 hp. Engine oil coolers transmission oil coolers, and cooling fans are mounted on the engine and form an integrally cooled powerplant.

TECHNIQUES, based on panel estimates, were developed for evaluating the odor and irritation intensities of undiluted diesel-engine exhaust gases or of various dilutions of these gases in air. Along with the estimates, chemical analyses were made to determine the concentrations of total aldehydes, formaldehyde, and oxides of nitrogen. Statistically significant correlations were found between odor or irritation intensity estimates and the analytical data, but these correlations were too weak to permit accurate prediction of odor or irritation from chemical analyses. Effects of some engine variables on diesel odor were studied. Possible means of reducing diesel odor are discussed.

THIS paper discusses the free-piston engine which is being investigated by Ford. The analytic method for calculating free-piston-gasifier thermodynamic performance over the complete operating range is discussed for the given limitations and conditions. Using these analytical methods, an automotive-size free-piston and matched turbine was designed, built, and tested.