ShinerBock wrote:
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Like I said before, don't care either way and prefer a GDI engine if I want performance in a small car, but if you think modern diesels pollute more because of what you heard from your favorite Californian news site then you are dead wrong and should probably do your own research rather than being a sheep to their group think. With the amount of PM that comes out of today's GDI engines, I would not be surprised to see a particulate filters on them in the near future.
Actually I figure if the California ARB allows a diesel to be sold there, it's gotta be pretty clean.
But what about the PM emissions of newer GDI engines? Apparently CARB is working on it:
CARB wrote:
the light duty vehicle fleet is moving towards gasoline direct injection (GDI) technology to comply with the Low Emission Vehicle (LEV III) greenhouse gas (GHG) standards. GDI technology was of particular concern in terms of PM emission impacts when the more stringent standards were first adopted in 2012. Test results from early GDI equipped engines showed significantly higher PM emissions than conventional port-fuel injector (PFI) systems. The 3 mg/mi PM emission standard for the FTP starts phasing in 2017 and will be fully implemented by 2021. Some manufacturers have already redesigned their engines to meet this standard. The US06 PM standard of 6 mg/mi starts phasing in 2017 for vehicles complying with the 3mg/mi FTP standard and will be fully implemented by 2021. However, vehicles in 2017 and 2018 will be certified to interim higher standards of 10 mg/mi for the US06.
Haven't read the full report pdf but others may find it interesting:
Google link to CARB PDF (big)
