Keywords: diesel engine, mechanical losses, energy-saving motor oil, antifriction coating, running-in mixture.

Methods are considered of how to improve engine mechanical efficiency through optimization of friction pairs' operating conditions. These authors offered new antifriction coatings for piston and cylinder liner surfaces. Furthermore, they offered energy-saving motor oil and composition for engine running-in mixture.

Keywords: reciprocation engine, transformed working cycle, separated strokes, added strokes, 5-stroke engine, 6-stroke engine, 8-stroke engine.

Working cycle of a reciprocation engine was analyzed for its transformation potential. Ways and methods of working cycle transformation have been classified. Considered are working cycles with geometrically separated strokes, as well as those of 5-, 6-, and 8-stroke engines.

Keywords: piston, piston skirt, hydrodynamic oil pressure, piston skirt deformation.

The authors offer computational model for strain/stress analysis of high-speed engine piston. Piston skirt deformation due to hydrodynamic impact of cylinder wall oil layer has been simulated. Such deformation was demonstrated as capable to affect contact between piston and cylinder liner.

Keywords: diesel engines, fuel injection pumps, injection rate, methods of prevention of fuel injection rate non-uniformity.

Presented are the results of tests of domestic-make and imported fuel injection pumps carried out on a dedicated test stand. Also, fuel injection rate for locomotive diesel engine was evaluated. Causes of fuel injection rate non-uniformity have been identified, and ways to eliminate thereof have been offered.

Keywords: KamAZ engines, pollutant emissions, test stand, UN/ECE Reg 49-05, test cycles, test result repeatability, compliance with Euro-5 standard.

The article describes the experience of JSV KamAZ with its newly-developed test stand where diesel engines may be tested for environmental performance characteristics. New technical solutions are presented targeted at better precision of pollutant emission measurement and test result repeatability when engines are tested for compliance with UN/ECE Reg 49-05.

Keywords: diesel engines, marine power plant, low-load operation, switching off cylinders, special tuning.

The potential of improving marine engine fuel efficiency during low-load operation has been studied. Partial switching off individual cylinders is demonstrated as the most efficient measure when combined with engine special tuning.

Keywords: diesel engines, pollutants, SCR exhaust gas cleaning system, dual-fuel engine, particle filtering, filter regeneration.

Technologies are considered that enable lowering of NOx emission to IMO Tier 3 specifications. Specialists of «Niigata Company» offered compact SCR system that secures lowering of NOx emission by more than 80 %. As an alternative, dual-fuel engine has been developed that comply with IMO Tier 3 specifications in «gas» operation mode. Specialists of National Fisheries University (Japan) developed new diesel particulate filter (DPF) with heater-regenerator to protect SCR catalyst from deactivation.