EMISSIONS
90-857138R1 MAY 2000 Page 3C-5
Stratified Charge
A stratified charge engine only pulls air through the transfer system. The fuel required for
combustion is forced into the cylinder through an injector placed in the top of the cylinder
(head). The injector sprays an air/fuel mixture in the form of a cloud into the cylinder. Sur-
rounding this cloud is air supplied by the transfer system. As the cloud is ignited and burns,
the surrounding air provides almost complete combustion before the exhaust port opens.
A stratified charge engine concentrates a rich mixture in the vicinity of the spark plug (air/fuel
ratio less than 14.7:1). Elsewhere, the mixture is very lean or is comprised of air only.
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