Abstract
The combustion chamber surface and cylinder air temperatures during cranking have been investigated in a direct injection diesel engine with combustion chambers of various conductivity materials, and the influence of combustion chamber materials and surface deposits on the cold startability was tested. The insulated chamber made of bakelite indicated higher surface and air temperatures than did the copper chamber with larger conductivity. As the result, the starting time in the copper combustion chamber for cold operation was 5 times longer than that in the bakelite chamber, and it was found that there is a relationship between the cold startability and the thermal conductivity of combustion chamber materials, and that the cold startability is improved by the increase of the combustion chamber deposits.
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