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Mazda 13B-REW Engine

 

The 13B-REW was the twin turbo version of 13B engine designed to power the third-generation RX-7 launched in late 1991.

 

 

13B-REW inherited its basic design from previous 13B engines. Each rotor on 13B-REW had a single combustion chamber volume of 654cc. With two rotors, total displacement was 1308cc. However in order to cope with boost generated by twin squential turbochargers, 13B-REW had extensive mechanical and electronic improvements including hardened apex seals, a free flow exhaust, enhanced cooling, revised intake and better lubrication. Thin wall cast-iron rotors with fully machined combustion recesses were used to ensure uniform combustion. The engine management system was almost the same with previous models. However, its data parameters had been greatly increased. The CPU precisely controled air/fuel ratio, ignition timing and boost pressure.

 

Mazda 13B Renesis Engine

 

The most important improvement of 13B-REW was the twin, sequential turbochargers. 13B REW was equipped with by the world's first volume-production sequential twin turbocharger system. This system was capable of delivering more power than a conventional twin turbo setup where both turbos boost at once. The sequential system was avoiding the turbo lag by utilizing a small and a large turbo at the same time. The small turbocharger with 51mm diameter could spool very quickly, providing boost from as low as 1500RPM. The bigger, 57mm diameter turbo kicked at higher RPMs, providing boost up to 8000RPM.

 

 

When 13B-REW was relased in 1991 it was delivering 255 HP at 6500RPM. Two years later, power output was increased to 265hp and in 1999 13B-REW joined the 280hp club. Mazda continued production of 13B-REW up until 2003 when the RX-7 was produced. With its proven reliability and high output 13B-REW is still a very popular engine. Besides its street usage many D1 teams use third generation RX-7 and B13-REW for racing purposes.

 

Model

13B-REW

Displacement (cc)

1308

Power Output (hp)

255 - 280

Number of Rotors

2

Years Produced

1991 - 2003

 

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