4 stroke diesel engine work


 🔄 **1. Intake Stroke** (Suction)


* **Action**: The piston moves **downward** from the top dead center (TDC) to the bottom dead center (BDC).

* **Valves**: The **intake valve opens**, exhaust valve stays closed.

* **What Happens**: **Air only** (not fuel) is drawn into the cylinder due to the vacuum created by the downward-moving piston.


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### 🔥 **2. Compression Stroke**


* **Action**: The piston moves **upward** from BDC to TDC.

* **Valves**: Both **intake and exhaust valves are closed**.

* **What Happens**: The air inside the cylinder gets **compressed**, increasing its pressure and temperature significantly.


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### 💥 **3. Power Stroke** (Combustion)


* **Action**: The piston is at TDC. At the end of compression:

* **Fuel Injection**: **Diesel fuel is injected directly** into the hot compressed air (using an injector).

* **Ignition**: The **fuel ignites automatically** due to the high temperature of the compressed air (no spark plug).

* **Result**: Rapid expansion of gases forces the piston **downward**—this is the **stroke that produces power**.


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### 🌬️ **4. Exhaust Stroke**


* **Action**: The piston moves **upward** again from BDC to TDC.

* **Valves**: The **exhaust valve opens**, intake valve stays closed.

* **What Happens**: Burnt gases are **pushed out** of the cylinder through the exhaust valve.

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