13B Mazda rotary engine rotary engine far the most productive, the production cycle of more than three decades. 13A 13B type type with nothing to do, but is 12A type of extended modified version, rotor depth 80mm, displacement of 654cc × 2. This engine from 1972 RX-4 has been used to 2002 RX-7, after many improvements during. 13B-REW addition to natural intake type version, the use of sequential twin turbo system, and reduce the compression ratio, so that the maximum power of 187kW (255Ps), maximum torque of 294Nm. However, this type of rotary engine is often referred to as “13B-RE”, because in the intake manifold is cast several words. Further, the most important features are: a first light weight, only 81 kg body weight, with the turbine system, the intake air cooler, into the exhaust manifold, the total weight of the element was 148 kg generators; first Second, high-powered: for example, RX-7FD late 1999 to develop a fifth type, horsepower has been increased to a maximum horsepower of independent Japanese automakers upper limit of 206kW (280Ps) a.
Although the third-generation RX-7 and are mounted EunosCosmo 13E-REW rotary engine which with a sequence containing a dual turbocharger system, but both turbine different sizes:
RX-7FD HITACHI HT-12 using two turbine type, a first start of all the exhaust gas concentrated in a small turbine diameter of 51mm, so that the turbine starts at low speed (about 1800 rpm for) work to reduce turbo lag phenomenon. When approaching the maximum operating speed of a turbine, the exhaust gas began to be introduced into the second large particle diameter 57mm turbine; once the engine reaches its operating speed (about 4000rpm), all of the turbine exhaust gas is concentrated here.
EunosCosmo using a large (HITACHI HT-15 type), a small (HITACHI HT-10 type) twin turbo, the actuation principle is the same RX-7FD.
