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Diesel engines have a much higher compression ratio than a petrol engine, meaning that they compress a larger volume of air into, for arguments sake, the same space as a comparitive petrol. This requires more torque to turn the engine over but results in a bigger bang. Which is why they are hard to start as they need a bigger electric motor to start them and are almost imposible to clutch start

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Q: Why is Diesel engine hard to start?
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