“Everyone would say at first glance that the diesel engine is more efficient (than the petrol engine). The truth is that if you had both engines at the same compression ratio, the spark-ignited engine has a faster combustion process and a more efficient process. In practice, it’s limited to a lower compression ratio otherwise you get spontaneous ignition.”
That is one of the stupidest statements I have read. Duh if you take away the benefits of running diesel the gas engine will be better.
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"It's not rocket surgery!" -MetroMPG
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