my technically minded motorist or !river of a petrol-engined van
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is aware the octane number of a gasoline tes the knack rating of the fuel and I high-octane fuel should be used in ase of a high-compression engine. the cetane number of a diesel fuel indicate its suitability relative to the ression ratio of the unit? One rarely he cetane number quoted.
'he higher the cetane number of a Iiesel fuel, the shorter is the delay between injection of the fuel and its n by the heat of combusion.
igh octane number is, therefore, favour o smooth running ard a low noise level. ariations in cetane number have little on the power output or efficiency of Igine. It may be assumed that the oil inies do not advertise the cetane number iel for this reason.
as lately been revealed that there may be idvantage in using a fuel with a high number. Ignition delay provides for thorough mixing of the fuel droplets he air which tends to reduce any smokndency. Conversely, reducing the delay I can impair mixing and may thus )te a tendency to smoke.