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Why are diesel engines slower than petrol engines?

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Diesel fuel burns more slowly than petrol, also both burn very fast under the conditions in the engine. This means that a small diesel engine can only rev to about 4000RPM compared to 6000 or more for a similar petrol engine. read more

A petrol engine is ligher than a diesel engine of same power output, thus it's power to weight ratio tends to be higher. This higher power:weight ratio is the reason for a tad bit faster acceleration in Petrol Engines as compared to Diesel Engines of similar capacity. read more

The petrol engine natively combusts so it does not need heavy duty parts to withstand the explosion, yes you are compressing the fuel but its not nearly as much as the diesel, that is why 100cc motorcycles rev like crazy they have lightweight construction (cranks, pistons). read more

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