Why Diesel Engines Produce More Torque than Petrol Engines? | डीजल इंजन का टार्क ज्यादा क्यों हैं ?

Torque is defined as a “twisting force that causes rotation,” and in the case of diesel engines, that rotation leads straight to the wheels. It’s also the rotation of the pistons in the engine that powers the wheels. It isn’t just a single rotation that gives a car power, however. Instead, it’s constant fuel injection that allows torque to continue, and to build on itself.
1. Diesels use higher compression ratios, which translate into more torque.
2. Diesel fuel undergoes complete combustion much sooner, meaning that the fuel spends more time pushing down the piston and translates into more useful work.
3. Diesel engines tend to have a longer stroke length, meaning that the piston will travel further up and down the cylinder. If torque equals force multiplied by distance and you increase that distance, you get more torque.
4. Diesel engines are usually turbocharged and built from components designed for a turbocharged engine, like iron blocks, heavy-duty pistons, etc. Also, diesels tend to burn lean, which means there’s more air to expand and create useful work.
5. Diesel fuel is more energy-dense than gasoline. This means that you can extract more energy from diesel than you can from the same amount of gasoline.
High compression ratio:
The first reason is a much higher compression ratio. This is the ratio of the maximum and minimum volume in the cylinder of an engine. It’s made larger in a diesel engine due to a longer stroke, meaning the piston is moving up and down a larger internal volume of cylinder. Diesel engines never rev as high as petrol engines due to the fact that the piston has to travel further for its full rotation, while a petrol engine uses its shorter stroke to move the piston in quicker bursts, meaning the engine speed can be faster.
Calorific value:
Another influence on torque output is the pressure exerted on the piston from the combusted fuel. Diesel (45500kJ/kg) has a slightly lower calorific value than petrol (45800kJ/kg) which means that more heat is actually contained within petrol for a given volume than diesel. However, diesel is much denser than petrol and can store up to 15 per cent more energy per given volume. This means that each time diesel is combusted, more energy is transferred through to pressure on the piston, increasing the amount of torque acting through the crankshaft.
Higher boost:
Many diesel engines are also turbocharged to make up for the lack of out-and-out horsepower and engine speed. This then creates a higher pressure within the cylinder for the power stroke, which in turn creates an increase in torque. In comparison to turbochargers on gasoline engines, diesel turbos are generally setup to a much higher boost pressure, which reduces pumping losses during the intake stroke of the engine, allowing the engine to become more efficient in its conversion of energy through to the crankshaft.
The main thing to take from all this is that horsepower is definitely not the be-all and end-all, but it certainly has its uses. A petrol-powered racing engine can produce little torque but the sheer rev range can mean a high horsepower figure. On the other hand, a low revving diesel engine will always struggle to reach the same value in horsepower but can capitalise on the torque gains. This is why you never find diesel engines in any super cars or hyper cars; if you have two engines making the same amount of torque but one of them is managing to rotate the crankshaft faster and therefore creating more power, you’d side with that one.
#DieselEngine #Torque #Automobile
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[@rajeshmadival2777]

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[@krish_bart]

Thanks for this information.

[@mainuddinahamad9912]

For diesel engine 20:1 For petrol engine 11:1

[@MECHANICALTECHHINDI]

👍

[@TheTusharj]

Very well explained.

[@mainuddinahamad9912]

Thanks

[@MECHANICALTECHHINDI]

Welcome

[@bharathbyrappa2803]

Great explanation of torque and cr .

[@MECHANICALTECHHINDI]

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[@sahilafsar9837]

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Nyc.

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[@MECHANICALTECHHINDI]

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[@kameshwariert]

Sir, kindly explain if kerosene is put in petrol and diesel engine, how does it behave. Waiting for your video and explanation.

[@MECHANICALTECHHINDI]

When kerosene engine is available in the market i will surely make the video

[@kameshwariert]

@@MECHANICALTECHHINDI sir, I am from ISRO, just wanted to know for the purpose of interview. Sometimes it is heard that kerosene oil also is used in diesel engines. How the diesel engine is run through kerosene oil. Please reply. Your explanations are awesome. Thanks a lot.

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[@MECHANICALTECHHINDI]

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Query- why 1000cc polo TSI have more power and torque than baleno 1200cc .

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Kya EGR ke karan torque me Kuch impact hota hai

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Sir turbo Kya kam karta hai

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power aur torque kis kis factors ke upar depend karta hain

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Sir supercharge kya turbocharger k jagaha use ho sakata hai? Aur kya difference hai dono k bich may?

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diesel engine car clutch hard kiyou hota hai ? petrol engine car ke tulname.

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You can go for SSC JE.

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Compression ratio me detail me video banaye

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please explain turbo charger with detail

[@MECHANICALTECHHINDI]

I have already uploaded detailed video

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Sir aapne example diya. Bottle ka...usko open karne ke liye aapne twisting force aply kia.... To usme. Power hp ka kaha pe role hai....

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Wo maine sirf torque ka example diya hai

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Diesel engine me petrol dal de to kya effect hoga

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Petrol

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Welcome