Quote:
Originally Posted by Ni87
I don't know. I'm still pretty young and inexperienced. But everytime I've deleted the egr my engibe has stayed cleaner and my mileage has increased. On my 87 Nissan I'm not sure how much it increased but doing the delete on my xterra gave me an extra 3 mpg. Now that I have this untampered Honda and a little more knowledge and experience I can do some more testing. But I understand your theory. From what I've read egr is just to decrease compression temperature down to reduce Nox or something.
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EGR does end up decreasing the dynamic compression ratio, which is indeed different from the static compression ratio usually advertised. When it comes to keeping the engine cleaner after an EGR delete, it's been more of an issue with Diesels and some of the earlier direct-injection gassers because they tend to have a higher particulate matter emission, plus the fuel injected at the intake manifold in a conventional gasser tends to dillute oily vapors aspirated from the crankcase through the PCV, preventing the carbon buildups to accumulate at the intake manifold.