Abstract
From the abrasion test of various metals which are using as cylinder liner and piston packing ring of internal combustion engine in the lubricating oil at 200°C, the author has obtained following result:
1. The pair of nitrided steel and 0·5-0·6% C-steel is the best. 2. The pair of cast iron is not good, the loss of weight attains to 10-30 times of former case. 3. There is very few relation between the abrasion at room temperature and the temperature of the cylinder wall. 4. The temperature of the cylinder wall may be lower than 200°C and rather good lubricating condition.
