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ⓘ Antiknock agent. An antiknock agent is added to gasoline. It reduces engine knocking and increase the fuels octane rating. Gasoline is a fuel mixture. High comp ..




                                     

ⓘ Antiknock agent

An antiknock agent is added to gasoline. It reduces engine knocking and increase the fuels octane rating.

Gasoline is a fuel mixture. High compression internal combustion engines place gasoline under great pressure. The pressure can cause the gasoline to ignite early pre-ignition or detonation causing a damaging knocking sound, also called "pinging" or "pinking".

Originally, organic compounds with lead were added to petrol to prevent knocking: tetraethyllead TEL. This is now banned because the lead affects peoples health. Various alternatives have been tried. 2.2.4- trimethylpentane, an isomer of octane, is one example.