two key limitations of using vegetable oil directly as a fuel in Compression Ignition (CI) engines:
🔻 1. High Viscosity
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Vegetable oils have much higher viscosity than diesel.
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This results in poor fuel atomization during injection, causing:
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Incomplete combustion
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Increased carbon deposits
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Fouling of injectors and piston rings
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❄️ 2. Poor Cold Flow Properties
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Vegetable oil can gel or solidify at low temperatures, leading to:
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Cold starting difficulties
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Clogged fuel lines and filters
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Inconsistent fuel delivery and power loss
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👉 Due to these issues, vegetable oil is typically converted into biodiesel to make it more suitable for CI engine use.
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