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A research octane number of 65 and volatility were low compared with modern fuels but probably suitable when considering the design of the flathead engine.
Fuel consumption increases with every unit reduction of octane number.
The octane number of any additional unleaded regular grade was left for member states to fix.
The way to increase the octane number is obviously to put in petroleum additives such as tetraethyl lead and tetramethyl lead.
The lead additive in petrol provides the octane number needed by vehicle engines.
The main decisions required were as to the number of grades of unleaded petrol and their octane number, and the precise timing for introducing the changes.
The octane number is an empirical measure of the resistance of gasoline to combusting prematurely, known as knocking.
The octane number of the alkylate depends mainly upon the kind of alkenes used and upon operating conditions.
Both of these processes raise the octane number of the substance.
Alkylation processes transform low molecular-weight alkenes and iso-paraffin molecules into larger iso-paraffins with a high octane number.
The higher the octane number, the more compression the fuel can withstand before detonating (igniting).
Where the octane number is raised by blending in ethanol, energy content per volume is reduced.
The degree of branching affects characteristics, such as the octane number or cetane number in petroleum chemistry.
Isobutane is primarily used by refineries to enhance (increase) the octane number of motor gasoline.
The research octane numbers in this specification have remained unchanged with the reduction of the lead alkyl content.
