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Mazda 13B-MSP Renesis Engine

 

In 2003 Mazda introduced the new RX-8, which was powered by the latest and the most advanced version Rotary Engine from Mazda. This new engine was named 13B-MSP Renesis. MSP was standing for "Multi Side Ports" and "Renesis" was the synonym for "Rotary Engine Genesis". The design challenge while developing 13B-MSP RENESIS engine was to retain power output on a par with the turbocharged 13B-REW. Besides that improved fuel economy and reduced emissions were entailed.

 

 

The only feature that 13B-MSP Renesis inherits from previous Rotary Engines is the two 654 cc rotors layout. Besides that 13B-MSP Renesis is an entirely new engine. The leading design improvement is the side exhaust ports. Unlike previous rotary engines, which employed side intake ports and peripheral exhaust ports, 13B-MSP Renesis has intake and exhaust ports in the side housings. This configuration eliminates the overlap between  intake/exhaust port timing. This way, the exhaust gas is not carried over to the next intake cycle, promoting more stable combustion and higher quality fuel economy.

 

Mazda 13B Renesis

 

13B-MSP Renesis uses 3 intake ports per rotor (primary, secondary and auxiliary) and the intake ports are 30% larger compared to previous versions. Intake ports open sooner and stay opened longer. 13B-MSP Renesis also has a variable intake timing mechanism to increase the efficiency even further.13B-MSP Renesis  has two exhaust ports per rotor unlike its predecessors which have single exhaust ports per rotor. This results a combined exhaust port opening area nearly twice as large and substantially reduces the exhaust resistance. Moreover, the exhaust ports open later, allowing a longer expansion stroke and improving heat efficiency.In order to reduce rotational mass and improve engine response, 13B-MSP Renesis 14% lighter rotors and 20% lighter flywheel. These improvements allow the engine to rev 8200RPM.

 

 

13B-MSP Renesis incorporates these improvements with known advantages -namely, low weight, compact size and high performance- of rotary engines. Naturally aspirated 13B-MSP Renesis engine manages to have an output of 250hp while its twin turbocharged predecessor was rated at 280hp. Besides that 13B-MSP Renesis  keeps lower fuel consumption and hydrocarbon emissions at lower levels.  13B-MSP Renesis  engine is truly a great leap forward for the rotary engines.

 

Model

13B-MSP Renesis

Displacement (cc)

1308

Power Output (hp)

250

Number of Rotors

2

Years Produced

2003 -

 

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