Diesel Index Formula:
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Definition: Diesel Index is defined as a measure of the ignition quality of a diesel fuel.
Purpose: It helps evaluate the combustion characteristics of diesel fuels, with higher values indicating better ignition quality.
The calculator uses the formula:
Where:
Explanation: The API Gravity is multiplied by the Aniline Point (divided by 100) to determine the Diesel Index.
Details: Diesel Index is crucial for determining fuel quality, with higher values indicating better ignition performance and cetane number.
Tips: Enter the API Gravity and Diesel Aniline Point in °F. Both values must be greater than 0.
Q1: What is a good Diesel Index value?
A: Typically, values above 45 indicate good ignition quality, while values below 35 may cause engine knocking.
Q2: How does API Gravity affect diesel quality?
A: Higher API Gravity indicates lighter petroleum fractions which generally have better ignition characteristics.
Q3: What does Aniline Point indicate?
A: Higher Aniline Points correlate with more paraffinic (better burning) and less aromatic (worse burning) content.
Q4: How is Diesel Index related to Cetane Number?
A: Diesel Index is approximately 60-70% of the Cetane Number for most diesel fuels.
Q5: What's the typical range for Diesel Index?
A: Most automotive diesel fuels have Diesel Index values between 30 and 60.