Five reasons why Diesel engine produces more torque than Gasoline

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The Diesel Engine is known for more power and better efficiency. Now the reasons why the diesel engine produces more torque are listed below.

Compression Ratio:

In both the engines when the piston moves towards the T.D.C, The Piston of the Diesel Engine compresses the air further more than its T.D.C. This is because in the diesel engine for instant combustion of the fuel heat of the air is required. Thus it raises the temperature above its self-ignition temperature for self-combustion. While in a Gasoline engine we do not require the air to be compressed more as a spark plug is used to ignite the fuel-air mixture and combustion to take place.
The following graph will show the efficiency of the Diesel Engine is more with respect to compression ratio:




Faster Combustion:

As we know in a gasoline engine the spark plug ignites and the flame travels till it burns all the air-fuel inside the cylinder whereas, in a diesel engine, complete combustion occurs as soon as the fuel is injected in thus combustion occurs much sooner.
That is, in a diesel engine the fuel spends more time in pushing down the piston whereas in gasoline engine translates into useful work. In the gasoline engine if the combustion still occurs (suppose at a point A) that will move the piston down for short duration only. But if it would have occurred at the top it would have moved the piston for the entire length. So the compression ignition property of the diesel engine gives more torque.

Bore Stroke Length:

The diesel engine actually has longer stroke length. For a gasoline engine, the bore diameter is more but the piston does not travel much up and down while in a diesel engine the bore diameter is not much wide but the piston moves quite more up and down. Now torque is the force multiplied by the distance. So in a diesel engine, the force is more and the distance of the stroke is more.

Diesel Engines are TurboCharged:

Diesel engines use heavy-duty pistons, iron blocks, connecting rods, crankshaft all of which add together to make a heavy engine that can handle the increased torque that is produced by the diesel engine. Also, the air-fuel ratio for diesel is 18:1 to 70:1. They burn lean and thus have more air to compress and produce more work. Pumping loss is also not there during the intake making the engine more efficient.


Calorific Value:


The diesel fuel has slightly lower calorific value than petrol. So more heat is stored in the petrol for the same volume of given diesel. But diesel is much denser than petrol and can store 15% more energy. So each time diesel is combusted it produces more energy to pressure the piston and more torque to the crankshaft.

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