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Why Do Diesel Engines Have A Higher Compression Ratio? The Secret Unrevealed

Combustion ratio is an essential determinant of any an engine’s behavior. It is the evaluation of the engine cylinder’s capacity to squeeze the fuel and air. Different engines such as petrol and diesel acquire diverse compression ratio. However, the ratio of the diesel engine is comparatively higher. Why do diesel engines have a higher compression ratio? This question must be striking in your mind and you will get the answer to it right now.

So let’s discover together!

Why Do Diesel Engines Have A Higher Compression Ratio – Major Reasons To Check Out!

Below we have listed the basic reasons why diesel engine consists higher ratio of compression than any other engine. So check it out!

1. Depending On The Application

Diesel engines are ideal for heavy vehicles such as locomotives, ships, trucks, and other gigantic automobiles. Therefore, it has higher torque application. To turn on such a big vehicle, it requires a large amount of energy that ultimately leads to augmented combustion rate. The air compression is the process which occurs in a large cylinder inside an engine. Hence, fuel also gets combusted quickly. It produces more power inside the engine, which ultimately leads to a higher compression ratio. Therefore, the size of the engine cylinder and of course, the application is the reason why do diesel engines have a higher compression ratio.

Basic reasons for why do diesel engines have a higher compression ratio
Major reasons for why do diesel engines have a higher compression ratio

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2. Evasion Towards Knocking

Knocking is a serious issue in engines. It happens when there is abnormal combustion inside the cylinder of the engine. Knocking issue is normally found more often in gasoline engines. As the compression ratio increases, the gasoline engine is knocked that’s why it is not considered to be an ideal compression engine by many people. Coming back to the diesel engine, there is no knocking occurrence. Bigger cylinder size provide enough space for your fuel to run and get combusted inside the engine.

The basic reasons why an engine can result in knocking includes:

  • Ignition delay inside the injectors

  • The increased temperature inside the engine

  • When fuel injector fails to completely ignite the fuel

Therefore, to avoid knocking in the engine, the diesel engine has a maximum compression ratio.

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3. Spark Plug

Gasoline or petrol engines require spark plug to combust the fuel. The diesel engine doesn’t require spark plug to generate power, instead, the high compression ratio is enough to ignite the fuel. To self-ignite the engine; the higher compression ratio is required. Moreover, the diesel is highly volatile and only air compression is enough to ignite the fuel. So to prevent engine burning or other hazards, a diesel engine is built in such a way that it acquires elevated compression ratio. Besides, to handle any unexpected issue with the diesel engine, you can learn some useful maintenance tips from the experts.

Look out for why do diesel engines have a higher compression ratio
Why do diesel engines have a higher compression ratio explained

Conclusion

So whenever you think about why do diesel engines have a higher compression ratio, remember this useful information and choose the engine of your desire.

1 Comment
  1. Ulan Batori says

    This is circular logic – and nonsense.

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