Mercury Optimax 150 User 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 150 Specifications

General

Horsepower	150 HP
Engine Type	V6
Alternator Output	60 amp / 756 watt
Starting	Electric
Steering	Remote
Displacement	2.5 L
Fuel Induction System	2-Stage Direct Fuel Injection (DFI)
Shaft Length	20", 25"
Dry Weight	431 lbs (20 in), 439 lbs (25 in)