Installation manual

90-898305
1-56
Stratified VS Homogenized Charge
OptiMax engines use a stratified charge inside the combustion chamber to aid
in reducing emissions. All other models use a homogenized charge. The
difference between the two is:
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 a fuel/air mixture in the form
of a bubble into the cylinder. Surrounding 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.
Notes
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