Question
Download Solution PDFIso-octane
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
According to standard practice, the antiknock value of an SI engine fuel is determined by comparing its antiknock property with a mixture of two reference fuels, normal heptane (C7H18) and iso-octane (C8H18).
Rating of SI engine fuel:
- The rating of SI engine fuels is based on their antilock property.
- Rating of a particular fuel is accomplished by comparing its performance with that of a standard reference fuel which is usually a combination of iso-octane (C8H18) and normal heptane (C7H18) plus tetraethyl lead.
- Iso-octane being a very good anti-knock fuel is arbitrarily assigned a rating of 100 octane number.
- Normal heptane, on the other hand, has very poor anti-knock qualities and is given a rating of zero octane number.
- Octane number rating is an expression that indicates the ability of a fuel to resist knock in a SI engine.
Last updated on May 28, 2025
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