The HCCI engine doesn’t use spark plugs for ignition since such lean fuel mixtures can’t be ignited by them, but the SkyActiv-X tech does. Mazda’s new engines manage that by using a second dollop of fuel that isn’t as lean as the primary air/fuel mixture. This secondary mixture gets ignited by a spark plug, raises the cylinder pressure and, in turn, combusts the primary mixture. The new engine tech is promising even better efficiency and more power, but it seems that engine noise may need some more fine-tuning.
Precious few vehicles can offer what the Chevy Bolt does in terms of money savings on gasoline. This dedicated small electric hatchback is one of the few such vehicles currently available, and it’s making the most of its situation. MY 2019 will spawn a number of new competitors for the Bolt, but GM’s subcompact hatch won’t be changed radically. Some sources are suggesting it’ll receive new semi-autonomous driving technology, but other than that only new colors and possibly trim options will be introduced.
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To be clear, power isn’t the thing that sets this car apart from the base model, though there was an optional exhaust offered that upped the output by 6 hp and makes the car that much rowdier. You’ll get the stock 6.2L V8 (which is no joke) making 430 hp and 424 lb-ft of torque. You’ll also enjoy a new appearance package which, while cool, is also functional, and was reported to reduce aero lift by around half. It also has big brakes from the Z06, special wheels, and a fantastic list of optional features. Look for a model with magnetic ride control and you won’t be sorry.
Smarts originally used engines under 1 liter in size, and you can pick up a rolling shell for under 3k easy. That means you can have this much fun for under 8k fabrication included. Try doing that with a 5-liter ‘Stang.
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