Mazda 13B-MSP Technical Information PDF herunterladen (Seite 63)

Powertrain Engines

Intake Stroke

• The volume of the operating chamber in position 1 is at its minimum, thus corresponding

with intake TDC (Top Dead Center) of a reciprocating engine. As the rotor continues to

turn from 2 through to 4, the intake ports become increasingly larger and draw in the

air/fuel mixture as the intake stroke begins. At the same time, the intake operating

chamber increases in capacity, reaching its maximum at 5. At this time, the rotor position

corresponds with BDC (Bottom Dead Center) of the intake stroke on a reciprocating

engine.

Compression Stroke

• After 5, the intake ports are covered by the rotor, ending the intake stroke. The operating

chamber’s capacity gradually becomes smaller, compressing the air/fuel mixture as the

compression stroke begins. As the rotor turns, the operating chamber capacity becomes

smaller and smaller from 6 through to 9, and at 10 when the compression is almost

complete, the mixture is ignited by the spark plugs. At 10, the operating chamber’s

capacity is at its minimum. This is TDC of the compression stroke.

Combustion Stroke

• The mixture ignited at 10 is burnt, pressure and volume increase, and expansion in the

operating chamber continues from 11 through to 13. During this time, the combustion

energy of the air/fuel mixture is applied to the rotor’s surface, and via the eccentric shaft

it is converted to rotational energy and used as motive power. At 15, the operating

chamber’s capacity reaches its maximum as it approaches BDC of the combustion

stroke.

Exhaust Stroke

• After completion of combustion, burnt gases are expelled from the exhaust ports as the

capacity of the operating chamber decreases from 15 through 18. This is the exhaust

stroke, and when this stroke ends there is a return to 1, from where the cycle starts

again.

Curriculum Training 01-53

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Mazda 13B-MSP Technical Information Seite 63