L3 Turbo Engine
Variable Swirl System
• The variable swirl system functions to lower emissions at cold-engine start (ECT lower
than 60° C) and at low engine speed (lower than 3750 rpm)
• If both these conditions are met, the variable swirl system increases intake airflow speed
by closing the shutter valve and narrowing the intake passage. As a result, the air-fuel
mixture quality is improved. Additionally, the creation of a powerful air swirl in the
combustion chamber promotes the atomization of the air-fuel mixture.
• Due to this, exhaust emission quality is improved.
• A variable swirl switch monitors the opening of the valve and is connected to the PCM
for feedback.
M6-MPS_01030
1 Variable swirl shutter valve actuator 3 Air cleaner
2 Variable swirl solenoid valve 4 Variable swirl shutter valve
01-30 Service Training Mazda6 MPS Supplement
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