Reply to Query asked by SUJOY KUMAR DAS on 14-06-2012
IN THE SAME CC ENGINE PERTOL VERSION SHOWS HIGHER BHP WITH LESSER TOURQUE COMPAER TO THE DIESEL VERSION. WHAT DOES IT MEAN ? IS THE DIESEL ENGINE IS MORE POWERFULL ?
Asked by SUJOY KUMAR DAS on 14-06-2012
Dear Sujoy, That's an excellent question! However, these different ratings have a lot to do with the inherent design of petrol and diesel engines. You may have also noticed that diesel engines produce their power and torque at a lower RPM and have a lower redline (max RPM) as well. Now, diesel engines are 'compression ignition' engines, and do not have a spark plug, while petrol engines are 'spark ignition' engines and use a spark plug. This is also because the 'flash point' or the combination of temperature and pressure which ignites the two fuels is very different. Owing to the different thermal and chemical properties of the fuels and the design of their engines, two engines of the same capacity will have very different characteristics if they are diesel or petrol. In simple layman terms, a diesel engine will have better 'mid-range' or drivability, whereas a petrol of the same capacity will still be slightly quicker in flat-out acceleration.
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