Cochin laboratory

NAPHTHALENE CONTENT (P 118, D 1840)

Assess the combustion characteristics of ATF of the kerosene boiling range. Napthalenes when burned tend to have a relatively larger contribution to a sooty flame, smoke, and thermal radiation than single ring aromatics.

OCTANE NUMBER.

The knock rating of a gasoline is expressed as octane number and is the percentage by volume of iso-octane (octane number 100) in a mixture with normal heptane (octane number 0) that has the same knock characteristics as the gasoline being assessed.

RESEARCH OCTANE NUMBER -RON (P 27, D 2699, IP 237)

The research method gives a rating applicable to mild operating conditions, that is, low inlet mixture temperature and relatively low engine loading such as would be experienced generally in passenger cars and light-duty commercial vehicles

MOTOR OCTANE NUMBER -MON (P 26, D-2700, IP 236)

The motor method which represents more severe operating conditions, that is, relatively high inlet mixture temperature and high engine loading such as would be experienced during full-throttle operation at high speed Research octane numbers are generally higher than those obtained by the motor method, and the difference between the two ratings is known as the sensitivity of the gasoline. The actual performance of a gasoline on the road (the road octane number) usually falls between the research and motor values and depends on the engine used and also on the gasoline composition and choice of antiknock compounds