For use with our CPN and CPN2 piston rings, we recommend plateau honing with a cylinder bore cross hatch angle of 35-40 degrees.

 

     30-40 degrees

 

To reach this roughness, the manufacturers of honing machines and accessories recommend using for a gray cast iron engine block and Nikasil cylinders.

• Conventional stones #220 - #280 grit or
• Diamond stones #325 - #550 grit

After honing with either the conventional or diamond stone, the same manufacturers suggest to finish your honing by smoothing the surface with a fine grit conventional abrasive (#400 - #600 grit) or to sweep the bores with a flexible brush or a nylon bristle plateau honing tool. This is necessary to get rid of jagged peaks and folded or torn material.

Important Note:

Be sure to confirm with your honing equipment manufacturer that the recommended stone grit will produce the following Rz and Ra roughness recommendations.

Rz = 59 - 138 µ in [=1.5 – 3.5 µm] or
Ra = 15 - 35 µ in [=0.4 – 0.9 µm]

Please click here to download a pdf of "Cylinder Honing Recommendations."