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Re: Has anyone heard anything else about the FSI engines in VWs? (PolyurethaneCow)

Those are direct-injection gasoline engines with spark ignition. One of the main benefits is the ability to run at leaner air/fuel ratios at light loads, thus they consume a bit less fuel than a conventional design would use.
If we see the FSI engines over here, they won't be able to use the lean-burn feature much (for now). The high sulfur level in North American gasoline results in the same issues that diesels have: high NOx emissions because the lean-burn catalyst to deal with NOx is poisoned by sulfur! Not being able to use the lean-burn mode wipes out the advantage.
I don't think we'll see them until low-sulfur fuels become widely available, and even then, only if they can get the higher NOx that comes with lean-burn through Tier 2 emissions. Same issues as diesels have.
(I'll stick with diesel as long as I have the choice ...)
Brian P.
'96 Passat TDI mit UPsolute
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