EMISSIONS
90-828631R3 MARCH 1999 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 bubble into the cylinder. Sur-
rounding this bubble is air supplied by the transfer system. As the bubble is ignited and
burns, the surrounding air provides almost complete combustion before the exhaust port
opens.
A stratified charge is hard to ignite, the fuel/air bubble is not evenly mixed at 14.7:1 and not
easily ignited.
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