Mazda 13B-MSP Technical Information Seite 62

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Engines Powertrain
Operating Principle
In the rotary engine, each of the three faces of the rotor forms a chamber. These three
chambers are not interconnected and their combustion cycles vary as described below.
In much the same way as the four-stroke reciprocating engine, the air/fuel mixture in a
rotary engine is subjected to combustion and expansion within the engine, thus
converting heat energy to output power.
However, while the reciprocating engine uses the vertical movement of the pistons and a
complex valve mechanism to allow gas exchange, a rotary engine uses the rotation of
the rotor to open and close intake and exhaust ports on either side of it.
Because each rotor has three working chambers, this means that for every single
rotation of the rotor three full working cycles (intake, compression, combustion, exhaust)
are completed, resulting in three power pulses being delivered to the eccentric shaft for
one rotation of the rotor (see explanation on following pages).
L1001.4_01116
01-52 Curriculum Training
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