Abstract
In this study, the cold startability and the blue and white smoke (cold smoke) in a direct injection diesel engine when changing the intake swirl and the combustion chamber shape have been investigated. In the shallow bowl and square cavity combustion chamber, the intake swirl does not have so large an influence on the startability; but in the deep type, the starting time becomes longer by increasing the intake swirl, and the cold smoke rises higher. It was found that the intake swirl was not necessary for starting and warming-up under cold conditions.
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