View Single Post
Old 10-11-2019, 10:13 PM   #23 (permalink)
It's all about Diesel
cRiPpLe_rOoStEr's Avatar
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 8,289
Thanks: 0
Thanked 904 Times in 800 Posts
Originally Posted by MeteorGray View Post
I wonder if direct-injection gas engines are more efficient enough to justify the addition of particulate filters? Otherwise, why not just go back to indirect injection gas models.
It's not just about direct injection, it has also something to do with enabling a leaner burn on higher-compression engines.

Or, perhaps the direct-injection gas engines don't produce enough particulates to make adding a particulate filter the expensive and disruptive mess that diesels are having to contend with nowadays.
Since the fuel for a gasser or a flexfuel is more volatile, the particulate matter emission might remain less troublesome. What might also influence is the fact that gassers might resort more frequently than Diesel engines to some fuel enrichment in order to decrease the NOx emissions, at the cost of higher PM levels...
  Reply With Quote