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Old 10-08-2021, 07:28 PM   #232 (permalink)
Isaac Zachary
High Altitude Hybrid
 
Join Date: Dec 2020
Location: Gunnison, CO
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Avalon - '13 Toyota Avalon HV
90 day: 40.45 mpg (US)

Prius - '06 Toyota Prius
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Quote:
Originally Posted by cRiPpLe_rOoStEr View Post
An increase to NOx emissions is still often pointed out as easier to mitigate on a gasser fitted with direct injection than on a Diesel, yet the PM is a real PITA for both. OTOH a gaseous fuel injected at the vapour phase, such as natural gas, won't be so troublesome regarding PM.
That's because the gasser can be run at a stoichiometric AFR and a still very homogenous charge. Yet direct injection with spark ignition lends itself to a lean burning engine with a stratified charge. But it seems most, if not all OEMs are going with the former and not the later in their direct injection engine designs.
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