Antiknock
Additives
Antiknock additives are substances added to gasoline to slow
the burning of the fuel and thus prevented “knocking,” I.e.,
the premature ignition of the combustion mixture in the cylinder
head. The most widely used antiknock additive was lead tetraethyl.
This was usually mixed with 1,2-dibromo- and 1,2-dichloride-ethane,
which prevented the formation of lead deposits in the engine.
Antiknock additives were phased out because of the dangers
of releasing lead into the environment. In their place, higher
octane fuels and upper cylinder lubricants were introduced.
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