Just changing the way a cylinder is honed can impact the performance of the engine. The surface finish of the bore plays a critical role in how well the piston ring seals. How can you know if you have the correct surface finish?

The Mitutoyo SJ-210 Profilometer measures surface finish, and this video takes you step by step through the process of setting up and using this amazingly handy device.

This video was part of the Engine Performance Expo. For more great engine tech, check out @Engine Performance Expo , which returns LIVE on YouTube on January 13th & 14th, 2023.

The detailed surface finish values of the extreme plateau hone as measured on an SJ-210 are: Rpk of 10 micro inches, a Rk of 44 micro inches and a Rvk of 72 micro inches.

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