Tinbender59
I AM JUST PLUM CRAZY
This is long and complex so hang with me, I have to explain several theories before getting to how the EGR affects the engine
Ok!! Here is the truth about EGR’s. Within the internal combustion gasoline engine there is a small problem, it is what I call “HEAT SOAK”. This Heat Soak will melt your pistons into a very large aluminum slug. A gasoline feed flame can reach as much as 2400 degrees F, most pistons give it up around 600F. Now I ain’t real savvy on some of this, but my math says I’m in trouble real fast like. So the brainyacks on mahogany row decided to use a little of nature’s own remedy. Almost all liquid’s known to man, naturally Draws heat to itself. During this process “ if intense heat is involved” the liquid is transformed “generally” into steam, thus carrying the heat into the exhaust system away from the pistons and block before it can be “soaked up”. The heat is then released via the exhaust pipe, through both convection and dumping at the tailpipe.
Now how is all of this accomplished?? You ASK? It is accomplished by a simple process known as “FUEL DUMPING” . That is we dump more gasoline into the chamber than what there is oxygen to support for a complete efficient burn. Thus the unburned fuel then becomes our “heat courier” in the form of steam.
Is everybody still on the same page? I sure hope so!!!
Ok now for the EGR’s roll,
Modern EGR’s are modulated; meaning the opening and closing are regulated in percentages, and is constantly being tweaked by the ECU. The NOX that is released into the intake system is put there to take up some of the clean oxygen’s place during low loads and deceleration thus allowing the ECU to throttle back on the amount of fuel it Is being dumped and the amount of fuel that is actually being used in low or no load situations. Hence better fuel economy! the NOX also helps difuse some of the flames heat, thus extending the life of the cylinder walls
In the early years of EGR’s you could get better millage by deleting them because they were either open or closed and normally stuck open, causing a ton of issues.
any questions?
Ok!! Here is the truth about EGR’s. Within the internal combustion gasoline engine there is a small problem, it is what I call “HEAT SOAK”. This Heat Soak will melt your pistons into a very large aluminum slug. A gasoline feed flame can reach as much as 2400 degrees F, most pistons give it up around 600F. Now I ain’t real savvy on some of this, but my math says I’m in trouble real fast like. So the brainyacks on mahogany row decided to use a little of nature’s own remedy. Almost all liquid’s known to man, naturally Draws heat to itself. During this process “ if intense heat is involved” the liquid is transformed “generally” into steam, thus carrying the heat into the exhaust system away from the pistons and block before it can be “soaked up”. The heat is then released via the exhaust pipe, through both convection and dumping at the tailpipe.
Now how is all of this accomplished?? You ASK? It is accomplished by a simple process known as “FUEL DUMPING” . That is we dump more gasoline into the chamber than what there is oxygen to support for a complete efficient burn. Thus the unburned fuel then becomes our “heat courier” in the form of steam.
Is everybody still on the same page? I sure hope so!!!
Ok now for the EGR’s roll,
Modern EGR’s are modulated; meaning the opening and closing are regulated in percentages, and is constantly being tweaked by the ECU. The NOX that is released into the intake system is put there to take up some of the clean oxygen’s place during low loads and deceleration thus allowing the ECU to throttle back on the amount of fuel it Is being dumped and the amount of fuel that is actually being used in low or no load situations. Hence better fuel economy! the NOX also helps difuse some of the flames heat, thus extending the life of the cylinder walls
In the early years of EGR’s you could get better millage by deleting them because they were either open or closed and normally stuck open, causing a ton of issues.
any questions?
