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Cylinder bore surface profile and process

  • US 9,382,868 B2
  • Filed: 04/14/2014
  • Issued: 07/05/2016
  • Est. Priority Date: 04/14/2014
  • Status: Active Grant
First Claim
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1. An engine block having a cylinder bore wall with a longitudinal axis, the wall comprising:

  • a first portion having a first diameter;

    a second portion axially adjacent to the first portion having a second diameter greater than the first diameter, and a plurality of parallel, circumferentially-extending, alternating grooves and teeth formed therein; and

    an un-roughened section immediately adjacent to an end surface between the first and the second portions, the un-roughened section having an axial length at least two times a width of the grooves and a diameter substantially equal to one of a first bore diameter measured to peaks of the teeth and a second bore diameter measured to bottoms of the grooves.

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