- #1
bman49
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Hi, I'm trying to put a long open-ended debate to rest.
For those who don't know, the EGR, Exhaust Gas Recirculation, system takes some of the exhaust gas and reintroduces it into the intake manifold. From what I understand, at 1600°C NOx is formed because air molecules, nitrogen N2 and Oxygen O2, react. By allowing cooled exhaust back into the intake, the combustion temperature of the engine becomes lower than the 1600°C. I should note that at idle and full throttle, the EGR valve is closed, and does not allow any exhaust into the intake.
The debate is whether or not removing the entire EGR system, and getting a tune to take it out of the ECU will allow for performance gains. Some say there won't be any performance gains and will hurt MPGs, and some say it would result in performance gains. I would think there would be performance gains. Each cylinder can only has a certain amount of displacement. I will be using Ford's 4.6 V8 motor. Each cylinder has .575 liters of space. If the EGR is not functioning then all .575 liters of space will be filled with .575 liter of the air and fuel mixture. If the EGR is functioning then all of the .575 liter of space will not be filled with the maximum amount of the air and fuel mixture as possible. There will still be a small amount of space occupied by the spent exhaust gases in the engine. Because of this, I would think removing the EGR system would increase performance. I have heard that because of the higher cylinder temperature, there will be pre-detonation. I don't understand why this is because at full throttle, when the EGR system is off, the cylinder temperatures would be at a high temperature than when at slight throttle with the EGR system on.
I would greatly appreciate anyone's input.
http://www.hitachi-c-m.com/asia/images/products/excavator/wheel/zx170w-3/KS_EN040_03.jpg
For those who don't know, the EGR, Exhaust Gas Recirculation, system takes some of the exhaust gas and reintroduces it into the intake manifold. From what I understand, at 1600°C NOx is formed because air molecules, nitrogen N2 and Oxygen O2, react. By allowing cooled exhaust back into the intake, the combustion temperature of the engine becomes lower than the 1600°C. I should note that at idle and full throttle, the EGR valve is closed, and does not allow any exhaust into the intake.
The debate is whether or not removing the entire EGR system, and getting a tune to take it out of the ECU will allow for performance gains. Some say there won't be any performance gains and will hurt MPGs, and some say it would result in performance gains. I would think there would be performance gains. Each cylinder can only has a certain amount of displacement. I will be using Ford's 4.6 V8 motor. Each cylinder has .575 liters of space. If the EGR is not functioning then all .575 liters of space will be filled with .575 liter of the air and fuel mixture. If the EGR is functioning then all of the .575 liter of space will not be filled with the maximum amount of the air and fuel mixture as possible. There will still be a small amount of space occupied by the spent exhaust gases in the engine. Because of this, I would think removing the EGR system would increase performance. I have heard that because of the higher cylinder temperature, there will be pre-detonation. I don't understand why this is because at full throttle, when the EGR system is off, the cylinder temperatures would be at a high temperature than when at slight throttle with the EGR system on.
I would greatly appreciate anyone's input.
http://www.hitachi-c-m.com/asia/images/products/excavator/wheel/zx170w-3/KS_EN040_03.jpg
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