IOC! Thanks for the info, your description suffices!
Quote:
Originally Posted by Frank Lee
Nope. This system was only on "V" engines. With the flapper shut, hot exhaust from that bank went up and over through the intake manifold via special passage to the exhaust manifold on the other side and it all continued on out from there. I doubt the back pressure rise on the flapper side was enough to cause an "EGR" effect.
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I think it's reasonable to assume there was an increase in effective EGR for both banks, especially the one w/ the flapper. Considering the very small amount of internal EGR in modern engines via VV/T-whateverthemanufacturerdecidedtonameit due to constraints wrt low load mixture and alla that I can see a halving of effective exhaust size up to the larger y-pipe resulting in a similar, albeit less symmetrical, situation.