Sunday, November 20, 2011

Why is an exhaust gas recirculation valve named as such when no part of it is connected in any way to exhaust?

usually called "EGR valves"


They're connected to the intake manifold and the throttle body (vacuum line).|||All EGR valves are hooked to the exhaust and intake in some fashion.





Some uses a metal line on EGR valve that runs to exhaust..





Others has an exhaust heat cross over port in the center of the cyl heads and intake (that you dont see from the outside) and the EGR sits pretty much on that port|||On many types of vehicles the "exhaust gases" are delivered to the EGR valve through the cylinder head and into the intake manifold. It IS connnected to the exhaust system through the exhaust ports in the head, but not through the exhaust manifold or pipes. It may appear that its not connected but indeed it is.|||What are you talking about? The EGR IS connected to the exhaust.....you should check where your getting your information becuase they obviously dont know what they're talking about|||They are connected to the exhaust. Look for the small metallic tube (most often mounted on the bottom out of sight) it goes to the exhaust portions of the vehicle.|||Absolutely, and where then does that unburned vapor go once it goes through the intake and is burned? Yep, out the exhaust, hence the name.





Function


At the heart of this system is a valve that meters the exhaust back into the engine. The working concept behind an EGR system is simple. A small amount of exhaust gas is recirculated back into the combustion chamber when the engine is prone to producing nitrogen oxides. Since exhaust gas is inert, in the sense that it cannot be burned again, combustion temperatures are reduced and, thus, the production of NOx is lessened. By way of a series of valves, passages, ports, relays, solenoids, and even computers, the exhaust gas is reintroduced on the intake side of the engine. Combustion temperatures are cooled, and nasty NOx production is kept at bay. In concept, the EGR system is simple, yet in practice things can become rather complicated.

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