In this article has been found that the most popular and widely used method of cooling is liquid cooling, which
ensures uniformity of temperature around the combustion chamber and easy acquisition and transfer of heat, although
the properties of water are limited by maximum temperature of the coolant. Preliminary scientific research of such
a system indicates the possibility of increasing overall efficiency and reducing toxic components in exhaust gases at
low engine loads when the engine exhaust temperature of the classic system is too low for efficient catalytic action.
This paper presents the dynamometer test stand designed and built using original components of diesel engine 4CT90
production of WSW "ANDORIA" SA. Presented system was designed for the four cylinder with indirect fuel injection
system. Research was made on the engine dynamometer stand, which was equipped with standard measure devices
(measures: speed, torque, temperatures, flows) and exhaust gas analysers. The temperature of this liquid was
increased to the higher level than temperature of boiling water in normal conditions. Overpressure inside the cooling
system was limited to 0.3 MPa, the temperature inside the cooling system was increased to 115–120°C. During the
test, the cooling system was filled with coolant at 90%. The selected results of investigations of the cooling system for
the combustion engine working with higher temperature of the cooling liquid, where the influence of speed and load
on the engine temperature were presented.
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