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Originally Posted by niky
Mazda's going even higher.
They reckon they've got the compression ignition problem licked, so the next generation of SkyActiv is going straight to 18:1.
On gasoline.
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I could bet some sort of "multifuel" ability might be on their plans for eventual military and aeronautical applications.
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Engineers tell me they'll still have spark plugs for cold start, but they shouldn't need them. Even better, injection pressure should be less than current common rail diesels, which means a cheaper fuel system and less issues.
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About 10 years ago there were some rumors about either Mercedes-Benz or GM being in a hurry to release an engine with that feature, which had been evaluated by GM using some Opel Insignia and Saab 9-3 test mules and was featured in the Mercedes-Benz F700 concept. GM claimed that it could run without the spark plugs at all, but they provided a smoothier and quicker cold-start ability. Anyway, I wonder how such engines would perform with ethanol or gaseous fuels such as biomethane.