Quote:
Originally Posted by GregWeld
regardless of whether or not the valve itself operates by vacuum doesn't really matter for purposes of this "argument":
How EGR systems work The EGR valve recirculates exhaust into the intake stream. Exhaust gases have already combusted, so they do not burn again when they are recirculated. These gases displace some of the normal intake charge. This chemically slows and cools the combustion process by several hundred degrees, thus reducing NOx formation.
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Okay, I've been trying to tell you it doesn't reduce exhaust temp. And for the last time tell me how this reduces exhaust gas temperatures?
Here's what you can do if you don't believe me, take a nice high dollar probe and stick it in your exhaust pipe, you can even use a fitting if you like. Take the temperature when the EGR valve is closed, the exhaust will be temp A.
Take the reading when the EGR valve is open, it will be temp A.
Recirculating gases and reducing pressure out your exhaust does not cool it in any way.