The valve timing of internal-combustion engines usually represents a compromise with regard to the requirements placed on power output and torque. This paper describes the development of a system for variable valve timing, taking the new Mercedes-Benz 4-valve engines as an example. Gas exchange calculation and tests carried out on a modified 4-cylinder engine have demonstrated that with two intake valve times and one specified exhaust valve time virtually the best possible torque characteristics combined with high power output can be achieved. Intake valve timing is adjusted dependent on load and engine speed by turning the intake chamshaft using a hydraulic-mechanically acting camshaft adjuster, whose functional principles are described in detail.
Variable Valve Timing in the new Mercedes-Benz Four-Valve Engines
Sae Technical Papers
Passenger Car Meeting & Exposition ; 1989
1989-09-01
Conference paper
English
Variable valve timing in the new Mercedes-Benz four-valve engines
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