The sophistication and precision of OEM automotive engines today often exceed that of race engines from a few years ago, leaving no margin for error in honing. Combustion efficiency is up, oil consumption is down, partly as a result of improved bore geometry and ring seal. Clearances and surface finish specs have tightened dramatically as new ring and piston technologies proliferate. Materials and surface coatings have evolved, and some now require diamond honing. Click here to continue reading.