11-26-2004, 09:46 PM
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Senior Member
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Join Date: May 2004
Location: Savannah, GA
Posts: 794
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From Chevron's website.
Quote:
CETANE NUMBER
Cetane Number is a measure of how readily the fuel starts to burn (autoignites) under diesel engine conditions. A fuel with a high cetane number starts to burn shortly after it is injected into the cylinder; it has a short ignition delay period. Conversely, a fuel with a low cetane number resists autoignition and has a longer ignition delay period. Although the cetane number of a fuel is assumed to predict its ignition delay in any engine, the actual delay represented by the cetane number is valid only for the single cylinder engine in which it was measured. The fuel's performance in other engines may differ.
A fuel's ignition delay is determined by its chemistry. In a warm engine, the delay is independent of the physical characteristics of the fuel, like volatility and viscosity. (The cetane index correlations utilize density and distillation temperature properties to estimate cetane number, but these properties are being used as indirect indicators of fuel chemistry, not as direct variables.)
Cetane numbers apply only to distillate fuels; they are not measured for fuels containing petroleum resid (marine fuels).
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