Indicate any 2 limitations of vegetable oil as a CI engine fuel.

two key limitations of using vegetable oil directly as a fuel in Compression Ignition (CI) engines:


🔻 1. High Viscosity

  • Vegetable oils have much higher viscosity than diesel.

  • This results in poor fuel atomization during injection, causing:

    • Incomplete combustion

    • Increased carbon deposits

    • Fouling of injectors and piston rings


❄️ 2. Poor Cold Flow Properties

  • Vegetable oil can gel or solidify at low temperatures, leading to:

    • Cold starting difficulties

    • Clogged fuel lines and filters

    • Inconsistent fuel delivery and power loss


👉 Due to these issues, vegetable oil is typically converted into biodiesel to make it more suitable for CI engine use.

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