Quote:
Originally Posted by Frank Lee
I've been thinking of a simple butterfly valve on the exhaust that basically traps heat in the exhaust and is, well, just another EGR that traps heat in the cylinder but without looping it around in exterior (to the cylinder) plumbing. Thing is, much/any more EGR at cold probably isn't tolerable...
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Like this?
Wasn't this common at one time? I seem to recall them on many cars.