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Technical Paper

New 1.0L I3 Turbocharged Gasoline Direct Injection Engine

To comply with the environmental demands for CO2 reduction without compromising driving performance, a new 1.0 liter I3 turbocharged gasoline direct injection engine has been developed. This engine is the smallest product in the new Honda VTEC TURBO engine series (1), and it is intended to be used in small to medium-sized passenger car category vehicles, enhancing both fuel economy through downsizing, state-of-the-art friction reduction technologies such as electrically controlled variable displacement oil pump and timing belt in oil system, and also driving performance through turbocharging with an electrically controlled waste gate. This developed engine has many features in common with other VTEC TURBO engines such as the 1.5 liter I4 turbocharged engine (2) (3), which has been introduced already into the market.
Technical Paper

A Study of High Power Output Diesel Engine with Low Peak Cylinder Pressure

This study examined a high-speed, high-powered diesel engine featuring a pent-roof combustion chamber and straight ports, with the objective of improving the specific power of the engine while minimizing any increase in the maximum cylinder pressure (Pmax). The market and contemporary society expect improvements in the driving performance of diesel-powered automobiles, and increased specific power so that engine displacement can be reduced, which will lessen CO2 emissions. When specific power is increased through conventional methods accompanied with a considerable increase in Pmax, the engine weight is increased and friction worsens. Therefore, the authors examined new technologies that would allow to minimize any increase in Pmax by raising the rated speed from the 4000 rpm of the baseline engine to 5000 rpm, while maintaining the BMEP of the baseline engine.
Technical Paper

Elucidation of the Sulfide Corrosion Mechanism in Piston Pin Bushings

Today, downsizing is realizing lighter and more compact engines, but at the same time, the use of turbochargers and other supercharging devices in order to supplement power and torque is increasing their power density, resulting in higher thermal and mechanical loads. In such environment, corrosion of the copper alloy bushes (piston pin bushes) that are press-fitted into the small ends of the conrods is becoming an issue. It is known that automotive bearing materials such as bushes suffer sulfidation corrosion as a result of reacting with an extreme-pressure additive (Zn-DTP) in the lubricating oil, but the reaction paths remain unclear. The research discussed in this paper therefore tried to elucidate the reaction paths in the reaction between Zn-DTP and copper in actual vehicle environments. Unit corrosion tests were conducted in order to identify the effect of the state of degradation of the oil and its temperature and copper content on corrosion.