A researchoctanenumberof 65 and volatility were low compared with modern fuels but probably suitable when considering the design of the flathead engine.
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Fuel consumption increases with every unit reduction ofoctanenumber.
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Theoctanenumberof any additional unleaded regular grade was left for member states to fix.
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The way to increase theoctanenumberis obviously to put in petroleum additives such as tetraethyl lead and tetramethyl lead.
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The lead additive in petrol provides theoctanenumberneeded by vehicle engines.
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The main decisions required were as to the number of grades of unleaded petrol and theiroctanenumber, and the precise timing for introducing the changes.
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Theoctanenumberis an empirical measure of the resistance of gasoline to combusting prematurely, known as knocking.
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Theoctanenumberof the alkylate depends mainly upon the kind of alkenes used and upon operating conditions.
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Both of these processes raise theoctanenumberof the substance.
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Alkylation processes transform low molecular-weight alkenes and iso-paraffin molecules into larger iso-paraffins with a highoctanenumber.
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The higher theoctanenumber, the more compression the fuel can withstand before detonating (igniting).
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Where theoctanenumberis raised by blending in ethanol, energy content per volume is reduced.
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The degree of branching affects characteristics, such as theoctanenumberor cetane number in petroleum chemistry.
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Isobutane is primarily used by refineries to enhance (increase) theoctanenumberof motor gasoline.
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The research octane numbers in this specification have remained unchanged with the reduction of the lead alkyl content.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
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