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A cold start is an attempt to start a vehicle's engine when it is cold, relative to its normal operating temperature, often due to normal cold weather. A cold start situation is commonplace, as weather conditions in most climates will naturally be at a lower temperature than the typical operating temperature of an engine. Occasionally, the term also refers to starting the engine of a vehicle that has been inactive or abandoned for a significant amount of time such as months, years or even decades. == Cause of Cold Starts == Cold starts are more difficult than starting a vehicle that has been run recently (typically between 90 minutes and 2 hours). More effort is needed to turn over a cold engine for multiple reasons: * The engine compression is higher as the lack of heat makes ignition more difficult * Low temperatures cause engine oil to become more viscous, making it more difficult to circulate. * Air becomes more dense the cooler it is. This affects the air-fuel ratio, which in turn affects the flammability of the mixture. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cold start (automotive)」の詳細全文を読む スポンサード リンク
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