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- W1569059953 abstract "Internal combustion engines purposed for passenger car drive are not perfect but there is no alternative drive yet that could replace IC engine in noticeable percentage. However, among IC engines there is a tough competition between two kinds of ignition. At present, a gasoline engine subjected to the ,,downsizing” [4] is the only alternative to very popular diesels. Such engine shows a specific fuel consumption similar to diesel maintaining the principal advantages of spark engine. The fundamental advantage is generating the maximum torque at about 1500 rpm and keeping it up to 3500 rpm for an engine operating within 850 to 5000 rpm range. However, such advantageous characteristics of torque can cause a limited durability of the piston-cylinder assembly. High torque at low speed creates an unfavorable conditions of collaboration between the upper compression ring and cylinder surface. Presented paper analyzes the oil film parameters between the upper compression ring and cylinder liner of ,,downsized” engine and compares these parameters with analogue ones of a regular gasoline engine of comparable power. High ring to cylinder pressure caused by gaseous forces at low piston speed leads to two disadvantageous phenomena, namely the drop in oil film minimum thickness and an increase in friction force. The paper presents an analysis of both parameters and the assessment of their scale. A minor effect of „downsizing“ on ring-cylinder friction power has been established, which is confirmed by the producers’ data concerning fuel consumption [4]." @default.
- W1569059953 created "2016-06-24" @default.
- W1569059953 creator A5039188527 @default.
- W1569059953 date "2008-01-01" @default.
- W1569059953 modified "2023-09-28" @default.
- W1569059953 title "Does downsizing limit the durability of piston-cylinder assembly?" @default.
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