Quote:
Originally Posted by Christ
So you're talking about EGR flow? (Rhetoric.)
What you're suggesting is that the exhaust is drawn back into the cylinder after having exited, which isn't true. What actually happens is that as the exhaust exits the engine, pressure in the exhaust channel builds as the flow slows, due to expansion and cooling, and this prevents the scavenging effect that you feel is so necessary.
Of course, I'm sure it never occurred to you that some automakers have actually designed engines with this in mind, because it's more efficient to just leave some of the exhaust gasses in the cylinder than to recirculate them via EGR flow... Of course, if there is exhaust gas left in the cylinder, that would reduce the dynamic displacement of the engine, meaning that less fresh air is drawn in, thus less fuel is necessary to maintain the same AFR, and a higher throttle angle must be used to generate the necessary amount of power to maintain the vehicle's speed, reducing pumping losses.
Do you have any links or data which backs up your claims?
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You did not just bag on my rhetoric... Nobody disses my rhetoric.
My statement was taken out of context, by yours truly.
And then you dare say that "it would never occur to me" that "some," but not "all" automakers (Wonder who those are.) ensure that gasses don't recirculate into the cylinder. That's not the cause of the problem. It hasn't occured to
you that I was, in fact, placing the blame on a lousy exhaust pipe design. At no point did I mention the EGR.
I do, as a matter of fact. Because I don't wanna go link hunting at this hour, I'll give you the publication "
How to Build Nissan Sport Compacts" by Sarah Foster as a source of my info.