Cylinder Honing Recommendations - Engine Builder Magazine
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Cylinder Honing Recommendations

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For use with CPN and CPN2 piston rings, it is recommended that you
plateau hone with a cylinder bore cross hatch angle of 35-40 degrees.

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To reach this roughness, the manufacturers of honing machines and
accessories recommend using the following stones 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.

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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]

– Tech Tip courtesy of CP Pistons

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