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Yes, a diesel may require more cranking power with cold weather.

The difference between gasoline and diesel engine is compression ratio. For standard gasoline engines it is between 7:1 to 10:1. It means that when piston is in Bottom Dead Center the volume inside cylinder liner closed by piston and cylinder cover is 7-10 times biger than the same volume when piston is in Top Dead Center. For Diesel engines compression ratio is around 16:1 to 22:1.

If you take a hand pump for bike tires and compress it to only half stroke and compare this with full stroke, you will see the difference between force you have to use.

At car electric motor is used for cranking cars engine. For rotating diesel engine you need electric motor with more torqe/power. For more torqe/power you need more electrical current. For mor electrical current at start you need bigger battery.

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14y ago

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