EJCP.PARTS

MAZDA 1.3 RENESIS

The Renesis engine – also 13B-MSP (Multi-Side Port) – which first appeared in production in the 2003 Mazda RX-8, is an evolution of the previous 13B. It was designed to reduce exhaust emission and improve fuel economy, which were two of the most recurrent drawbacks of Wankel rotary engines. It is naturally aspirated, unlike its predecessors from the 13B range, and therefore slightly less powerful than Mazda RX-7's twin-turbocharged 13B-REW (255-280 hp). The Renesis design features two major changes from its predecessors. First, the exhaust ports are not peripheral but are located on the side of the housing, which eliminates overlap and allows redesign of the intake port area. This produced noticeably more power thanks to an increased effective compression ratio; however, Mazda engineers discovered that when changing the exhaust port to the side housing, a buildup of carbon in the exhaust port would stop the engine from running. To remedy this, Mazda engineers added a water jacket passage into the side housing. Secondly, the rotors are sealed differently through the use of redesigned side seals, low-height apex seals and the addition of a second cut-off ring. Mazda engineers had originally used apex seals identical to the older design of seal. Mazda changed the apex seal design to reduce friction and push the new engine closer to its limits. These and other innovative technologies[citation needed] allow the Renesis to achieve 49% higher output and reduced fuel consumption and emissions (the RX-8 meets LEV-II[citation needed]). The Renesis won International Engine of the Year and Best New Engine awards 2003 [6] and also holds the "2.5 to 3 liter" (note that the engine is designated as a 1.3 liter by Mazda) size award [7] for 2003 and 2004, where it is considered a 2.6 L engine, but only for the matter of giving awards. It only actually displaces 1.3 liters.[8][9] This is because a 1,3L 2-rotor wankel has the same number of/equivalent power cycles in one rotation as that of a 2.6L four-stroke piston engine. Finally, it was on the Ward's 10 Best Engines list for 2004 and 2005. The Renesis has also been adapted for a dual-fuel use, allowing it to run on gasoline or hydrogen.[10][11] All the Mazda rotary engines have been praised because of their light weight.[citation needed] The unmodified 13B-MSP Renesis Engine has a weight of 122 kg (247 lbs), including all standard attachments (except airbox), but without engine fluids (such as coolant, oil, etc.).[WIKI]

SIZES BLOCK MATERIAL HEAD MATERIAL CAM TYPE FUEL SYSTEM
1.3 ALUMINUM ALUMINUM N/A FI

ITEMS

BRACKETS EXHAUST MANIFOLD INTAKE MANIFOLD OIL PAN PISTON
SENSORS TIMING COVER TIMING SET VALVE COVER VALVE INFORMATION

LISTING TEMPLATES

SIZES COMPATABILITY ENGINE TEMP HEAD TEMP CRANK TEMP NOTES
1.3 04-08 RX8 ***** ***** ***** MANUAL
1.3 04-05 RX8 ***** ***** ***** AUTOMATIC
1.3 06-08 RX8 ***** ***** ***** AUTO
1.3 09-11 RX8 ***** ***** ***** NOTE AUTO OR MANUAL

VALVE INFORMATION

MAKE MODEL YEAR RANGE
****** ******* *******
TYPE HEAD DIAMETER STEM DIAMETER O.A.L. GROOVES LOCATION
EXHAUST ***** ***** ***** ***** ******
INTAKE ***** ***** ***** ***** *****

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