Computer Simulation of the Variation of Cylinder Bore Surface Profile during Running-in

The surface profiles of the cylinder bore near TDC, BDC and the middle of stroke during running in have been recorded by a stylus instrument. The experiment results show that the variation of the surface profile of cylinder bore is a process in which the initial surface profile is gradually substituted by the newly generated surface profile during running in. A computer simulation model is also established to study the variation of the surface profile of the cylinder bore during running in. The results obtained with the simulaton model conform well with the testing phenomena.