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A comment on SKYACTIV-X: first commercial gasoline engine to use compression ignition. Parent comment

Re:SKYACTIV-X: first commercial gasoline engine to use compr... by maxerickson on Tuesday August 08, 2017 @05:32PM (#14962978)
A typical NOx reduction is to feed some exhaust gas into the air intake to reduce the amount of oxygen in the chamber.

https://en.wikipedia.org/wiki/Exhaust_gas_recirculation

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