Quote:
Originally Posted by RustyLugNut
This might be true of PFI ( port fuel injected ) engines, but not for GDI. Many Asian market GDI engines have lean burn and suffer the same black carbon production. It is inherent to the injection and combustion profile.
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I bet a little more compression, a longer stroke and lean burn would reduce carbon.
Also which Asian market GDIs go lean? Just curious.
Quote:
Originally Posted by RustyLugNut
Water injection at the ports will clean up the valve's back faces but will cause displacement of air and reduce the specific power of the engine which is the advantage of GDI in the first place. The injector will have to be in-cylinder to provide the power/emissions benefit but then there will be no valve cleaning effect.
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Who said water mist has to be on all the time and always the same volume?
Could easily have it shut off near WOT. and be on during lean burn partial throttle.