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Great info. I just wonder if they had not choked off the lean burn development with emissions restrictions (not against regulation but it should be weighed overall for effects), and allowed the developemnt of the newer ultra high pressure injection, if the combination of modern improvements could not have achieved HCCI by now.
Note:
By weighed overall they should have considered the ultra low C02 emissions against the slightly over reg NOX emissions.
regards
Mech
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