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RoverP480 · 15th September 2019, 08:01

I would have thought that one full load it would be closed. The main reason for EGR is to reduce NOX which is produced when an engine runs with excess air (oxygen) . At full load the engine needs all its air but at part throttle the fuel is reduced and therefore less oxygen is required so the oxygen in the air intake volume is reduced by diluting it with exhaust gas. It is also operates for other reasons but the main one is to reduce NOX.

15th September 2019, 08:01	#9
RoverP480 Gets stuck in None at the moment Join Date: Jan 2018 Location: Hereford Posts: 501 Thanks: 1 Thanked 165 Times in 146 Posts	I would have thought that one full load it would be closed. The main reason for EGR is to reduce NOX which is produced when an engine runs with excess air (oxygen) . At full load the engine needs all its air but at part throttle the fuel is reduced and therefore less oxygen is required so the oxygen in the air intake volume is reduced by diluting it with exhaust gas. It is also operates for other reasons but the main one is to reduce NOX. Last edited by RoverP480; 15th September 2019 at 08:03..