HCCI type engines will take in both air http://www.timtomtumb.info/mercedes-e300d-injector-pump.html
and fuel but continue to rely on an unaided auto-combustion process, due to higher pressures and heat. This is also why diesel http://www.timtomtumb.info/road-clearance-for-mercedes-ml350-4matic.html
and HCCI engines are more susceptible to cold-starting issues, although they will run just as well in cold weather once started. Light duty diesel engines in automobiles and light trucks employ glow plugs that pre-heat the combustion chamber just before starting to reduce no-start conditions in cold weather.
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