Here are two key reasons for using ethyl alcohol (ethanol) as a fuel in SI (Spark Ignition) engines:
✅ 1. High Octane Number
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Ethanol has a high octane rating (≈ 108), which allows it to resist engine knock (pre-ignition or detonation).
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This enables higher compression ratios in SI engines, leading to better efficiency and performance.
✅ 2. Renewable and Cleaner Burning
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Ethanol is a renewable biofuel, typically produced from crops like sugarcane or corn.
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It burns cleaner than gasoline, producing less CO and unburnt hydrocarbons, and lower net CO₂ emissions (due to carbon neutrality from plant sources).
✳️ Bonus Benefits:
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Provides cooling effect due to high latent heat of vaporization.
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Can be blended with gasoline (e.g., E10, E85) to reduce petroleum consumption.
Ethanol is increasingly used in modern SI engines, especially in flex-fuel vehicles and biofuel initiatives for sustainable energy.
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