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Mazda may have found the apex in ICE design with the Skyactiv-Z

48 points by breve

by bob1029

1 subcomments

> No turbocharger is used, but a small Roots-type supercharger expands the compression ignition window by adding more air to the engine to allow leaner fuel mixes – especially at higher speeds where avoiding knock is more problematic.
This is a surprising engineering decision considering the efficiency goals. I'd be curious to see how they managed to offset the parasitic losses. In a hellcat engine, the supercharger consumes anywhere from 10 to 100hp depending on engine load. You can never turn it off.

by fxtentacle

2 subcomments

“the apex of internal combustion engines means they’re doing more than just propelling a vehicle around roads and highways. They’d also be air purifiers, removing CO2 as they go.”
which sounds amazing, but is followed by 0 facts or information on how that might work.