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Technical Paper

Some Features of Nodular Cast Iron Crankshafts Used in the Chinese EQ140 Series Truck Engines

1983-11-07
830868
In the Chinese EQ140 series truck engines, nodular cast iron crankshafts are used. Though the works possesses a 12000 ton mechanical press, and therefore is able to produce crankshaft forgings, nodular castings are prefered. Some 200,000 crankshafts have been installed in the engines, which are doing very arduous work in Chinese truck usage. As compared with a forging, the cost and equipment investment of a nodular cast iron crankshaft is lower. Machinability is improved. Especially the anti-wear quality is appreciably better.
Technical Paper

Gasoline Combustion Chambers-Compact or Open?

1983-11-07
830866
A single cylinder research engine has been used to study a range of gasoline combustion chamber designs which have been divided into three categories open, compact and four valve. Measurements of fuel consumption and exhaust emissions are presented at full load and part load conditions, and a comparison is made of the best chamber from each category. At full load the performances of the three chambers were very similar at low speeds but at high speeds the superiority of the four-valve was clearly shown. At part load there were significant differences in the burn rate when operating at lean mixtures with the compact design showing the highest level and hence the most extended lean limit. The relationship between part load fuel consumption and full load octane requirement is presented as a method of comparing the relative performance of a range of combustion chamber designs.
Technical Paper

Turbocharging for the Fuel Efficient Urban Car

1983-11-07
830878
The arguments are given for the use of a 1.3 litre turbocharged spark ignition engine as a substitute for a 2 litre normally aspirated engine for late-80's compact cars. Descriptions of the three stages leading to an optimised engine-turbocharger package are described, together with details of the prototype TC engine manufacture and testing including supercharger tests to define operating limits. An outline of the optimising computer program is given, together with examples of computed camshaft designs giving significantly improved performance at low engine speeds. Some experimental results are given, including those of in-car testing which showed fuel consumption reductions of 12-22% over urban driving cycles.
Technical Paper

Experiments on the Coupling and Transmission Behavior of Crankshaft Torsional Bending and Longitudinal Vibrations in High Speed Engines

1983-11-07
830882
The coupling behavior of the torsional, bending, and longitudinal vibrations in the crankshaft is described. The incidental excitation forces under crankshaft torsional vibration due to reciprocating and rotating masses are derived theoretically. Experiments on the coupling behavior of the crankshaft vibrations and the excitation behavior in the engine structure were performed in a four-cylinder automotive engine; their results are discussed.
Technical Paper

Developing the Chassis Dynamometer as a Service Tool

1983-11-07
830932
This paper reports development work undertaken by Mazda Motors to expand the usefulness of the chassis dynamometer as a tool for service staff. Engineering laboratory equipment in the form of a computer generated driving trace has been adapted to enable reliable and repeatable fuel consumption and part throttle performance testing. Present and possible future developments are discussed in efforts to effectively utilize the chassis dynamometer in the service workshop situation.
Technical Paper

A New Concept in Engine Deposit Control Additives for Unleaded Gasolines

1983-11-07
830938
Polymeric gasoline deposit control (DC) additives have increased in acceptance during the 1970's. Their effectiveness in controlling gasoline engine carburetor and induction system deposits has been clearly demonstrated. However, with increasing use of unleaded gasolines, two side effects--increased combustion chamber deposits which can lead to increased octane requirements and increased oil viscosity due to migration of the additive package into the crankcase--have been noted. A new generation of DC additive technology based on a unique polyether structure was developed to minimize the noted side effects while maintaining deposit control performance. Extensive field tests of the new additive have demonstrated excellent deposit control with attendant maintenance of fuel metering and exhaust emissions performance. Vehicles using the new additive have octane requirements measurably lower than vehicles using the earlier additives.
Technical Paper

Future Trends in Automotive Fuels and Engine Oils

1983-11-07
830935
Spark-ignited gasoline engines are being designed with higher compression ratios using high-swirl, fast-burn combustion chambers and extensive use of electronic controls. These factors, together with the trend to lower lead levels and increasing use of unleaded gasoline, will affect antiknock requirements. Gasoline volatility will be optimized to provide satisfactory performance with available refinery components. The effects of these factors on future gasoline quality requirements are reviewed. The potential for oxygenates as transportation fuels is also assessed. Continued emphasis on fuel economy will result in increased dieselization. This, together with the trend toward heavier crude oils and more catalytic cracking, will result in diesel fuels with lower cetane number, higher final boiling point, and increased density and viscosity. Test data indicate that the effects of these changes on engine performance should be minimal.
Technical Paper

Development of High Strength Bolt for Connecting Rod

1991-11-01
911300
In recent years, efforts for development of high-performance and compact automobile engine are being made more actively than ever before. The connecting rod bolt is one of those parts which are very much required to be compact and light, since its size and weight affect the performance of the engine. However, if it is used under high stress, delayed fracture can be caused. Therefore, it is a common practice to keep the stress below 1177MPa. The developed alloy (HB149) is a precipitation hardening alloy steel of low carbon martensite, composed mainly of 0.35C-1.2Cr-1.0Mo-0.3V. With lowered intergranular inclusions by suppressing impurity elements such as phosphorus and sulfur, and with reduced grain boundary embrittlement by tempering it at a high temperature, this steel is excellent in resistance to delayed fracture. Using this steel, we developed a 1372MPa class (Class 14.9*) high strength connecting rod bolt.
Standard

PEENING MEDIA Cast Steel Shot, Regular (45 - 52 HRC)

1994-04-01
HISTORICAL
AMS2431/1
This specification, in conjunction with the general requirements covered in AMS 2431, establishes the requirements for regular cast steel shot to be used for peening of metal parts.
Standard

PEENING MEDIA Glass Shot

1988-04-01
HISTORICAL
AMS2431/6
This specification, in conjunction with the general requirements covered in AMS 2431 establishes the requirements for glass shot to be used for peening of metal parts.
Standard

Steel, Corrosion- and Heat-Resistant, Bars, Wire, Forgings, Mechanical Tubing, Rings, and Stock for Forgings, Rings, or Heading 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V (A286) Consumable Electrode Remelted 1800 °F (982 °C) Solution and Precipitation Heat Treated

2023-11-15
CURRENT
AMS5732K
This specification covers a corrosion- and heat-resistant steel in the form of bars, wire, forgings, mechanical tubing, and flash welded rings up to 5.00 inches (127 mm), inclusive, in nominal diameter or least distance between parallel sides (thickness), and stock for forging, flash welded rings, or heading of any size.
Standard

Steel, Corrosion- and Heat-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Stock for Forging and Heading 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V (A286) Consumable Electrode Remelted 1650 °F (899 °C) Solution and Precipitation Heat Treated

2023-09-07
CURRENT
AMS5737R
This specification covers a corrosion- and heat-resistant steel in the form of bars, wire, forgings, mechanical tubing, up to 5.00 inches (127 mm), inclusive, in nominal diameter or least distance between parallel sides (thickness), and stock for forging or heading of any size.
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