Mazda 13B-MSP 1.3L Renesis Engine Specs, Problems, Reliability

Mazda 13B-MSP 1.3L Renesis Engine Specs, Problems, Reliability. The 13B-MSP Renesis engine is a totally different and the most innovative Mazda’s rotary engine which was used in the Mazda RX-8 from 2003 to the 2011 year. It was developed with the target to keep the efficiency of the turbocharged 13B-REW but at the same time to enhance fuel effectiveness and minimize emissions. The name Renesis is a combination of Rotary Engine (RE) and Genesis. The abbreviation MSP is Multi Side Ports which make the engine different from its Mazda’s rotary predecessors.

Mazda 13B MSP 1.3L Renesis Engine Specs

Instead of the 13B-REW, the 13B-MSP is a naturally aspirated (NA) engine. It kept two-rotor layout with a capability of 1308 cc (79.81 cu in), the very same rotor radius and length. Each chamber volume is 654 cc. The biggest enhancement is the 13B-MSP has two exhaust ports per rotor in a side real estate instead of one peripheral exhaust port for each chamber on the Mazda RX-7’s engines. That decreases gas circulation resistance (nearly the double the exhaust port location than of the 13B-REW), gets rid of intake/exhaust overlap, and increases thermal efficiency, power, and fuel effectiveness. Now the unburned gases are not brought in the next combustion cycle.

The outcome is more steady and efficient combustion. The 13B-MSP engine was provided in basic and high-output variations. The standard variations have two consumption ports per chamber, and high-output – 3 consumption ports per chamber (primary, secondary and auxiliary). The cross-sectional location for the intake ports is an almost 30% larger compared to the 13B-REW engine. The engine geared up with lighter parts to reduce rotational mass: rotors are lighter by 14%, flywheel – by 20%. That offered a high throttle responds, more power, and permits the engine to rev up to 8200 rpm.

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Mazda 13B-MSP 1.3L Renesis Engine Specs, Problems, Reliability

All 13B-MSP engines got Consecutive Dynamic Intake System (S-DAIS) for controlling the secondary and auxiliary ports, and the variable consumption valve. The main intake is utilized at low rpm just. The secondary port begins operations at 3750 rpm after the shutter valve would open. The high-output engines have the auxiliary port which would open at about 6250 rpm. The variable consumption valve is utilized to lengthen the intake manifold and for increased mid-range torque. It would open at around 5750 rpm (at 7250 rpm for high-output engines). Variable fresh air duct (FAD) is another consumption system which you can discover in the high-output versions of 13B-MSP. It opens an unique valve at around 5500 rpm to reduce the air intake manifold. Together with the variable consumption valve, they increase power and torque at high engine speeds.

The engine has fuel injection run with the injection pressure of 392 kPa. The primary intake port injectors have 12-hole. The secondary and auxiliary ports got 4-hole injectors. Mazda likewise developed and used Jet Air-Fuel Mixing System for intake air. The 13B-MSP engine also has two iridium-tipped spark plugs per rotor chamber, due to a large combustion cycle. The tracking and leading spark plugs had various lengths.

Mazda’s engineers made a substantial step forward in the development of the rotary engines. The Renesis engines is an actual personification of all former benefits (compact size, lightweight, high performance) combined with lower fuel intake and emissions. Mazda’s 13B-MSP Renesis handles to have an output of 250 hp, which is truly near to its twin-turbocharged predecessor – the 13B-REW. The Renesis won International Engine of the Year and Finest Brand-new Engine awards 2003, and it was on the Ward’s 10 Best Engines list for 2004 and 2005.

Mazda 13B-MSP Engine Problems and Reliability

Really quick wear of the primary bearings of the eccentric shaft. Obviously, since it rotates 3 times faster than the rotors. The second problem is uneven heating of the rotor real estate. The upper part (here are the consumption circulation and compression strokes) are chillier than the lower (combustion stroke and exhaust gases circulation). Nevertheless, the engine will be warped at an uprated supercharged power of more than 500 hp.

The engine is susceptible to the kind of oil. The practice has actually revealed that artificial oils, even unique ones, form a lot of carbon residue during the combustion process. It collects on peaks and decreases compression. Mineral oil is combusted nearly wholly. Service experts suggest changing oil every 3,000 miles (5,000 km). Oil nozzles in the stator can stop working because of dirt entering the internal valves. Climatic air permeates them through the air filter, and the late replacement of the air filter causes this problem.

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Problems with the cold start of the engine, particularly in the winter, are due to the loss of compression. That typically occurs due to the wear of peaks and the look of carbon residue on electrodes of spark plugs due to poor-quality gasoline. Constantly utilize the premium fuel and modification spark plugs every 10,000 miles (15,000 km). A typical mileage prior to a complete restore of the 13B-MSP is less than 100,000 miles.

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Mazda 13B-MSP 1.3L Renesis Engine Specs

Manufacturer Mazda
Production years 2003-2011
Cylinder block material Aluminum
Cylinder head material
Fuel type Gasoline
Fuel system Fuel injection
Configuration Rotary engine
Number of cylinders Two rotors
Valves per cylinder
Valvetrain layout
Bore, mm
Stroke, mm
Displacement, cc 1,308 cc (79.81 cu in)
Type of internal combustion engine Wankel engine, naturally aspirated
Compression Ratio 10.0:1
Power, hp 192-250 hp (141-184kW)
Torque, lb ft 156-163 lb-ft (211-222 Nm)
Engine weight 247 lb (112 kg)
Firing order
Engine oil weight 5W30 or 10W40 Semi-Synthetic oil
Engine oil capacity, liter 3.3/3.5 (0.2 litres – oil filter)
Oil change interval, mile 12,000 (20,000 km)/12 months
Applications Mazda RX-8