Quote:
Originally Posted by cRiPpLe_rOoStEr
When those direct-injection Orbital engines were highlighted by the media and extensively tested by Ford, NOx emissions were pointed out as the reason why they were shelved. Little did everyone know how we would nowadays see LNTs and even particulate filters on gassers 
Something like a Detroit, but with spark plugs? |
Ya, i guess NOx would be a problem. Maybe because of higher surface temps, but also because it would be hard to keep fresh air out of the exhaust. Three way catalytic converters work best at reducing NOx in an oxygen starved environment.