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Originally Posted by MeteorGray
I wonder if direct-injection gas engines are more efficient enough to justify the addition of particulate filters? Otherwise, why not just go back to indirect injection gas models.
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It's not just about direct injection, it has also something to do with enabling a leaner burn on higher-compression engines.
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Or, perhaps the direct-injection gas engines don't produce enough particulates to make adding a particulate filter the expensive and disruptive mess that diesels are having to contend with nowadays.
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Since the fuel for a gasser or a flexfuel is more volatile, the particulate matter emission might remain less troublesome. What might also influence is the fact that gassers might resort more frequently than Diesel engines to some fuel enrichment in order to decrease the NOx emissions, at the cost of higher PM levels...