Katerina Swanson
The Mazda 13B engine is a sensational engine that has divided opinions among enthusiasts. The 13B range is capable of significant improvements, and the 13B-REW is the most impressive. The 13B-RESI, with its improved economy figures, quickly became the most sought-after rotary engine in the Mazda lineup. The 13B-DEI engine, introduced in 1986, featured a four-injector electronic fuel injection system, with two injectors for the lower rev range and the remaining two for the upper rev range. The 13B-T engine, found in the Series 5 FC3S RX-7 'GTX' model, had a four-injector system and incredible tuning potential. The 13B-REW, introduced in 1993 with the FD3S RX-7, is the most popular 13B engine to modify for turbocharged applications.
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What You'll Learn
The 13B-RESI engine has four injectors
The Mazda 13B engine is one of the most sensational engines ever created. The 13B-RESI engine has four injectors. This engine can be found in the HB Luce, Cosmo, and SA22/FB Series 3 RX-7. The 13B-RESI engine was a significant upgrade from the previous AP version, with a unique two-stage intake tract that boosted its power.
The four injectors in the 13B-RESI engine work in conjunction with a revised intake system. Two injectors provide fuel for the lower rev range, while the remaining two injectors supply fuel to the upper rev range. This results in improved fuel economy, especially in everyday driving conditions. The 13B-RESI engine also features Bosch L-Jetronic fuel injection, enhancing its output to 135 PS (99 kW) and 180 N⋅m (133 lbf⋅ft).
The 13B-RESI engine's four-injector system not only improves performance but also offers flexibility in tuning. The engine's dual injector format, combined with the traditional four-port intake, unlocks its tuning potential. Many 13B-T engines with this four-injector setup have been known to produce over 250 hp.
The 13B-RESI engine's four injectors contribute to its overall performance and efficiency. With two injectors dedicated to the lower rev range and two to the upper rev range, the engine can optimise fuel delivery for different operating conditions. This, coupled with the Dynamic Effect Intake system, enhances the engine's power and fuel economy.
It's worth noting that while the 13B-RESI engine has four injectors, the number of injectors alone does not determine an engine's resilience or tuning capabilities. Rotary engines like the 13B are known to be less resilient when it comes to tuning. Detonation or excessive heat can quickly damage the engine, requiring extreme caution during adjustments.
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Two injectors for the lower rev range
The Mazda 13B engine is one of the most sensational engines ever created. The 13B-DEI engine, which arrived with the second-generation FC3S RX-7 in 1986, featured a four-injector electronic fuel injection system. Two injectors provide fuel for the lower rev range, while the remaining two supply fuel to the upper rev range, improving the economy in typical everyday driving situations.
The 13B-DEI engine could push out far more power than its predecessor, the 12B, thanks to this new fuel injection system. This engine had a 0-50 mph time of 6.3 seconds and improved economy figures, quickly becoming the most sought-after rotary engine in the Mazda lineup. The four-injector system also contributed to better drivability and improved combustion quality with a revised intake.
The 13B-DEI engine was a game-changer for rotary enthusiasts, as strapping a turbo to the 13B resulted in impressive power figures. In 1986, the 1.3L engine could produce 185 hp and 183 lb/ft of torque, which would have been unheard of at the time. The later 9.0:1 compression ratio 13B-T engines found in the Series 5 FC3S RX-7 'GTX' model took things even further, delivering 200 hp and 195 lb/ft of torque.
The 13B-T engine maintained the dual-injector format but opted for a traditional four-port intake. This engine had incredible tuning potential, and many 13B-T's were soon running with more than 250 hp. The 13B-T engine powered the turbocharged versions of the FC3S RX-7 and utilised lower-compression rotors, further enhancing its performance.
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The remaining two for the upper rev range
The Mazda 13B-DEI engine features four injectors, with two supplying fuel to the lower rev range and the remaining two dedicated to the upper rev range. This setup provides improved economy during everyday driving. The upper rev range injectors are only activated when needed, and they work in conjunction with a revised intake tract to deliver a significant boost in power.
The 13B-DEI engine, introduced in 1986 with the second-generation FC3S RX-7, marked a transition from the 12A engines. While the 13B-DEI remained naturally aspirated, it offered increased power thanks to its four-injector electronic fuel injection system. This additional set of injectors for the upper rev range not only enhances performance but also contributes to improved combustion quality.
The Mazda 13B rotary engine, with its roots in the Wankel rotary engine design, stands out for its use of triangular rotors mounted on an eccentric shaft. This design enables smoother operation and high-revving potential, a signature trait of Mazda's rotary engine lineup. The 13B-DEI engine, with its four injectors, exemplifies Mazda's ongoing pursuit of innovation and performance enhancement.
The upper rev range injectors in the 13B-DEI engine are designed to engage at higher engine speeds, complementing the lower rev range injectors. This configuration allows for a more efficient fuel delivery system, optimising performance and fuel economy. The additional injectors for the upper rev range contribute to the overall responsiveness and power output of the engine, making it a sought-after choice for automotive enthusiasts.
The 13B-DEI engine's four-injector setup, with two dedicated to the upper rev range, showcases Mazda's engineering prowess in optimising performance and fuel efficiency. This design not only enhances the driving experience but also contributes to the engine's overall reliability and longevity. The precise fuel delivery and combustion improvements resulting from this injector configuration have solidified the 13B-DEI's reputation as a robust and dynamic powerplant.
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The 13B-T engine has a dual injector format
The Mazda 13B engine is one of the most sensational engines ever created. The 13B-T engine features a dual injector format, which sets it apart from other engines in the Mazda lineup.
The 13B-T engine's dual injector format consists of four fuel injectors, with two injectors dedicated to the lower rev range and the remaining two supplying fuel to the upper rev range. This configuration provides improved economy, especially in typical everyday driving situations. The 13B-T engine was a game-changer when it was introduced in 1986, as it offered 185 horsepower and 183 lb/ft of torque from a 1.3L engine, which was unheard of at the time.
The dual injector format contributed to the engine's impressive performance and efficiency. The four-injector electronic fuel injection system, coupled with improved combustion quality through a revised intake, allowed the 13B-T engine to produce significantly more power than its predecessor, the 160 hp DEI engine. The higher compression ratio of 9.0:1 in the later 13B-T engines further enhanced its power and torque, delivering an impressive 200 hp and 195 lb/ft of torque.
The dual injector format also provided the 13B-T engine with incredible tuning potential. With simple modifications, many 13B-T engines were soon capable of producing more than 250 horsepower. The combination of impressive stock performance and the potential for significant power increases made the 13B-T a favourite among rotary engine enthusiasts.
Overall, the 13B-T engine's dual injector format played a crucial role in its success and popularity. It not only improved the engine's performance and efficiency but also opened up a world of tuning possibilities, solidifying its place as one of the most sought-after rotary engines in the Mazda lineup.
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$207.82
The 13B-REW engine has larger injectors
The Mazda 13B engine is one of the most sensational engines ever created. The 13B-REW engine, in particular, stands out as the most impressive in the 13B range. Its turbocharged capabilities overshadow its predecessors, making it the most sought-after engine in the 13B lineup. The 13B-REW engine's impressive upper-rev capabilities can be further enhanced with breathing mods to reduce backpressure and maximise performance.
To optimise the 13B-REW engine's breathing, simple bolt-on modifications are a great starting point. These include a full turbo-back exhaust, high-flow cats (HFC), downpipes, an efficient air filter, and an intercooler. Once the engine is breathing well, an aftermarket ECU is necessary to adjust the air/fuel ratio and unlock additional benefits.
Many owners have successfully increased the stock turbos to 15 psi through ECU tuning and supporting modifications, such as a larger fuel pump and larger injectors. This results in a significant power increase, with some 13B-REW engines achieving around 350 hp.
The 13B-REW engine's popularity is not limited to cars; it has also found its way into various applications, from hot rodders to bikes and even light aircraft. The engine's impressive performance, affordability, and distinctive sound have solidified its legendary status among automotive enthusiasts, even after Mazda ceased its production in 2012.
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Frequently asked questions
The Mazda 13B-DEI engine has four fuel injectors.
The Mazda 13B-T engine also has four fuel injectors.
The Mazda 13B-REW engine has stock turbos, which can be upgraded with larger injectors. The exact number of injectors is not specified.
The Mazda 13B-RESI engine has two fuel injectors.
Fuel injectors deliver and atomize fuel for more power and better throttle response.
