Voorbeelden van octane number

• 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.