A cylinder hone is used to surface the cylinder wall by spinning grinding stones around the cylinder while moving them up and down. Each engine builder will have a hone specification. For example 280 grit hone moved up and down at a rate that produces hatching (scratches) at a 45 degree angle to each other. It's important to get it right for the piston rings to function properly and, among other things, to maintain compression. The surface of the cylinder wears over time and the hatch can disappear. It's good to be able to see it after 50K miles. It means there is no excessive wear in the cylinders. In fact, to me, it means little wear. It leads me to believe that they cylinder sleeves are quite good and can hold the hone for quite some time. It means the piston is well designed and the piston skirts are not coming in contact with the cylinder walls. It means the piston rings are well designed and seating beautifully in the cylinders without generating uneven wear around the cylinder. In short, it's a good thing.
Connect With Us