Keywords: marine reciprocating engine, connecting rod, pre-deflect, structural design, reduction in the life time.

The article discusses theory and methods of strength & life time calculations for a pre-deflect connecting rod. The case study illustrates considerable influence of pre-deflection on connecting rod strength and life time. The methods offered may be used as supplementary to classic method of calculation of pre-deflect connecting rod strength and life time.

Keywords: V-engines, main and slave pistons, pistons' stroke equalization, graphical analysis, analytical calculation, crank gear layout.

The authors present graphical analysis and analytical calculation of conditions enabling equalization of main and slave pistons' strokes in V-engines featuring traditional and desaxial crank gear layouts. Piston strokes have been calculated for virtual engines D/S = 10/12; 15/16 и 15/18. Comparison of analytical calculation results and measured piston strokes of same-dimensioned real engines respectively demonstrated good convergence.

Keywords: Alpha-type Stirling engine, loose-fit, movements of power and displacer pistons, kinematic parameterization.

The article discusses kinematic parameterization of loose-fit Alpha-type Stirling engine at varying length of power & displacer piston connecting rods, and angle between cylinder axes. Dependences are derived for relative motion of power & displacer piston in loose-fit Alpha-type Stirling engine. Furthermore, limitations are defined on a relation linking lengths of power & displacer piston connecting rods, taking account of distance between both cylinders' axes in a plane perpendicular to the crankshaft axis. Based on the results of this research, optimum parameters of Alpha-type Stirling engine under design may be defined.

Keywords: diesel engine, diesel fuel oil, vegetable oil, mixed fuel, cetane number, ignition delay period, reduction in toxic emissions.

Results are presented of the research work dedicated to experiments on type D-245.12 (1CHB11/12,5) engine firing diesel fuel added with various types of vegetable oil (10 % vol.), including rapeseed, sunflower, soya, corn, linseed, mustard and cameline oils. It is shown that use of mixed oil results in lowering of all regulated noxious emissions and exhaust opacity, particularly at maximum power and maximum torque. Calculated dependences have been derived of mixed fuels' ignition delay period and NOx emissions vs. cetane number and oxygen concentration.

Keywords: diesel engine, lube oils, additives, certification test methods, research into motor lube oil chemistry (chemmatology).

Efficiency and environmental performance of automotive, locomotive and marine diesel engines greatly depend on quality of base oils and lubricants, which, in turn, requires new technologies of their production and testing. In this country oil production facilities specialized in base oils are being gradually decommissioned. Unfortunately, domestic chemmatology is largely backward due to absence of modern equipment which could be used for lube oil certification in compliance with internationally accepted specifications.

Keywords: locomotive and marine diesel engines, D49 engine dimensional range, design development, improvement in operating parameters.

The article presents principal stages of the development of D49 engine dimensional range and power units based thereon. Each generation and its specific is described in detail. Names of authors and main executives of each modernization project are listed.

Keywords: marine engines, controlled emission zones, NOx emissions, IMO Tier-III level, exhaust gas recirculation.

After the enactment of the International Maritime Organization resolution 286 (71), as an addition to the North-American emission control area (ECA), where emissions are limited to IMO Tier-III level, since 01.01.2021 the Baltic and the North Seas are subjects to the same limitations. Caterpillar Motoren GmbH & Co. KG chose exhaust gas recirculation (EGR) as a means to reduce NOx emissions from M32C marine diesel engine to IMO Tier-III level. This paper describes the combustion system configuration. Also presented are engine modernization concept, principal test results and main advantages of EGR, along with some of the more challenging aspects of its implementation.

«GE Transportation», a division of General Electric, manufactures equipment for the railroad, marine, mining, drilling and energy generation industries. Since recently, it produces renewed series of well-known EVO family engines, which comply with EPA Tier 4 и IMO Tier-III standards. This family includes a number of in-line and V-engine models. It serves the marine market in variants from 6 to 16 cylinders. By the time of writing this paper over 7.500 EVO engines have been commissioned. The new engines feature cooled exhaust gas recirculation (EGR), 2-stage turbocharging, Miller valve timing, and high-pressure common-rail fuel injection, along with sophisticated control strategies to achieve an «in-cylinder» solution.

The CIMAC papers are translated into Russian by G.Melnik, PhD.