https://www.greencarcongress.com/2019/04/20190426-nissan.html
Quote
...Nissan's Decherd assembly line is using a mirror bore process in the all-new 2019 Nissan Altima 2.5-liter engine......This will mark the highest volume application of the technology within Nissan. The team in Decherd assembles an engine every 19 seconds and is capable of building about 1.4 million engines a year....
...The mirror bore treatment, first used in the Nissan GT-R and applied to other specialty models such as the Sentra NISMO, eliminates the need for bulky cylinder liners and raises energy efficiency by reducing the friction inside the engine....
...Rather than inserting a cylinder liner, mirror bore coating technology sprays molten iron onto the surface of the cylinder bore and forms an iron coating layer on the walls inside. By giving this a mirror-like finish, the drag that arises when the piston is operating can be reduced.... a special drill bit is used containing tiny bits of diamonds that were unfit for jewelry. The bit is spun at high speed inside the cylinder to polish the metal until shiny and smooth—giving the process its "mirror bore" name and the cylinder walls a reflective surface...
...compared to the roughly 2mm-thick cylinder liner, the 0.2mm mirror bore coating is extremely thin, making for better heat conduction. This results in better cooling performance and less engine knocking...
...[this new engine] also adopts a resin intake port. The resin port is inserted into the intake port cast in the cylinder head, thereby forming an air layer between the intake air passageway and the head inner wall so as to suppress the rise in intake air temperature. This world's first application of a resin intake port improves anti-knock performance, thus contributing to improvements in combustion efficiency and power output...
Quote
...Nissan's Decherd assembly line is using a mirror bore process in the all-new 2019 Nissan Altima 2.5-liter engine......This will mark the highest volume application of the technology within Nissan. The team in Decherd assembles an engine every 19 seconds and is capable of building about 1.4 million engines a year....
...The mirror bore treatment, first used in the Nissan GT-R and applied to other specialty models such as the Sentra NISMO, eliminates the need for bulky cylinder liners and raises energy efficiency by reducing the friction inside the engine....
...Rather than inserting a cylinder liner, mirror bore coating technology sprays molten iron onto the surface of the cylinder bore and forms an iron coating layer on the walls inside. By giving this a mirror-like finish, the drag that arises when the piston is operating can be reduced.... a special drill bit is used containing tiny bits of diamonds that were unfit for jewelry. The bit is spun at high speed inside the cylinder to polish the metal until shiny and smooth—giving the process its "mirror bore" name and the cylinder walls a reflective surface...
...compared to the roughly 2mm-thick cylinder liner, the 0.2mm mirror bore coating is extremely thin, making for better heat conduction. This results in better cooling performance and less engine knocking...
...[this new engine] also adopts a resin intake port. The resin port is inserted into the intake port cast in the cylinder head, thereby forming an air layer between the intake air passageway and the head inner wall so as to suppress the rise in intake air temperature. This world's first application of a resin intake port improves anti-knock performance, thus contributing to improvements in combustion efficiency and power output...
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