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Old 02-06-2006 | 04:57 PM
  #17  
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Flyboy Dave
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From: Pinon Hills, CA
Default RE: Break-in a rebuilt engine?

There is a difference in what we would call cross-hatching, depending on
the method of manufacture. Cylinders that are honed to size with precision
hones usually show less cross hatching simply because the finish hones are
finer than the hones and bottle brushes that are used to resize cylinders in
a small repair shop.

The new cylinders that are honed to finished size do have the cross hatching,
but it is harder to see. Cylinders that are bored to size have ridges cut into them
like an old 45 rpm vinyl record. The rougher stones and bottle brushes are used
on these to "take down" the evenly spaced ridges, and effect the cross hatch pattern.

Also, the "honed to size" cylinders have a smoother surface to start with, and don't
require as heavy a cross hatch.

FBD.