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Lube-
Like your ideas. The stratified charge that Cat is using sounds very much like the stratified charge that Honda used in the CVCC. The goal of that engine, of course, was to meet CA emissions without the benefit of a cat. Considering though that CAT is mainly supplying engines for large trucks, which are governed by an entirely different air quality standard, how pertinent is this for passenger cars?
European manufacturers will say that Urea injection is the solution to NOx...but that probably won't work for small vehicles where there is no room for a 15 gallon of "urea" solution.
I also know that arvin-meritor is working on a "Plasmatron" which is a super high heat chamber that excites the NOx so that the chemical bonds are broken. Still years away.
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1967 R50/2
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