Internal Combustion Engines
By higher octane number of spark ignition fuel, it is meant that the fuel has

Higher flash point
Higher heating value
Lower volatility
Longer ignition delay

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Internal Combustion Engines
Supercharging is the process of

Providing forced cooling air
Supplying compressed air to remove combustion products fully
Injecting excess fuel for raising more loads
Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

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