Mazda 13B-Series Engines
13B Engines are the latest and the most advanced series of Rotary Engines from Mazda. The basic design dates back to 1967 when Mazda relased Cosmo Sport, the first commercial vehicle to recieve a two rotor Rotary Engine. The engine used in this model was named L10A. L10A evolved and improved with Mazda's engineering team to the 12A. With two 573cc rotors 12A displaced a total of 1146 cc. 12A was using a hardened rotor housing which made 12A engine much more reliable compared to L10A.
Mazda continued developing the 12A engine and in 1975 the first 13B engine was released. Actually 13B was a lengthened version of the 12A. Having bigger rotors thus having a bigger displacement, 1308 versus 1146. 13B was first introduced as naturally aspirated. But later on single (13B-RE) and than twin turbo (13B-REW) versions were produced. As the power of the engine increased, developments were made to the engine. The high stress areas were reinforced to cope with the high load caused by the turbochargers. Intake and exhaust ports were redesigned so was the oiling and cooling systems. The newer versions were also more reliable and more fuel efficient thanks to Mazda's great effort on these subjects.
Mazda further developed the 13B engine prior to use in current RX-8. New developments were focused on reducing exhaust emissions and improving fuel economy, which were two of the most recurrent drawbacks of rotary engines. The latest version is named 13B-MSP Renesis. It features many new tecnologies and is considered to be a benchmark for the Rotary Engines.
For more information on spesific engines please check out related pages.