Abstract
Double acting type (DA type) six cylinder engine is developed in this laboratory, and to raise the engine performance, it keeps researching. Then, it was going to raise the engine performance by developing a new piston ring, and decreasing the number of the gas leakage and frictional force at current year. The development of the testing set to be able to measure the gas leakage and the frictional force at the same time in having reproduced the usage condition of an actual piston ring to need the gas leakage and the friction power examination device in the piston ring unit to evaluate the effect of the piston ring quantitatively is advanced. In this report, the outline and the content of the design of the testing set under development are described.
