zeitgeist57 Posted September 11, 2017 Report Share Posted September 11, 2017 I get that DI engines are far more fuel efficient, but I cannot help but see commuter vehicles - especially bland white/silver sedans like the Fusion, Sonata, Avalon, etc. - where the stylized chrome exhaust and/or rear bumper is all sooted up like a diesel vehicle that's been rolling coal. Curious if anyone knows what "trade-off" we've made from an environmental/engineering standpoint, replacing fuel efficiency for a noticably sootier exhaust. Is it a visual cue that I don't need to worry about? I already know about many performance DI engines needing walnut-shell treatments to clean carbon buildup out of intake manifolds and valves. Just a thought... Quote Link to comment Share on other sites More sharing options...
Grudes Posted September 11, 2017 Report Share Posted September 11, 2017 As you already eluded to, more carbon build-up inside the engine on the backs of valves and rings causing misfire conditions and oil consumption. If you drive them hard from time to time it helps alleviate the carbon build up. Quote Link to comment Share on other sites More sharing options...
Lauren Posted September 11, 2017 Report Share Posted September 11, 2017 A lot of the carbon build up can be alleviated with catch cans Quote Link to comment Share on other sites More sharing options...
99StockGT Posted September 12, 2017 Report Share Posted September 12, 2017 If you drive them hard from time to time it helps alleviate the carbon build up. Remember the old timers excuse for when they get pulled over speeding? "Just blowing the carbon out officer" What's old is new again. Quote Link to comment Share on other sites More sharing options...
Grudes Posted September 12, 2017 Report Share Posted September 12, 2017 Remember the old timers excuse for when they get pulled over speeding? "Just blowing the carbon out officer" What's old is new again. Haha true. It used to be a problem with carbureted engines too Quote Link to comment Share on other sites More sharing options...
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