Mercury Optimax 135 Service Manual

EMISSIONS
90-855347R1 JANUARY 1999 Page 3D-3
Stratified vs Homogenized Charge
DFI 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:
Homogenized Charge
A homogenized charge has the fuel/air particles mixed evenly throughout the cylinder.
This mixing occurs inside the carburetor venturi, reed blocks and crankcase. Additional
mixing occurs as the fuel is forced through the transfer system into the cylinder.
The homogenized charge is easy to ignite when the air/fuel ratio is approximately 14.7:1.

Mercury Optimax 135 Specifications

General

Engine Type	V6
Horsepower	135 HP
Fuel Induction System	2-stage direct fuel injection
Full Throttle RPM Range	5000-5750 RPM
Alternator Output	60 amp / 756 watt
Starting System	Electric
Steering	Remote
Dry Weight	431 lbs
Shaft Length	20", 25"