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RX8 Rotary Engine Rebuild - Parts, Replacements and Rebuild Solutions

Engine parts and rebuild solutions for the Mazda RX8 rotary, covering everything an owner needs to plan a proper RX8 rotary engine rebuild from the ground up. Whether you’re sourcing a replacement engine or pulling together the components for a full rebuild, start here.

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Two red RX8 screw type oil caps showing top logo and threaded underside

AUTOEXE Oil Filler Cap (Screw Type) for Mazda RX8 (Series 1, 2003-2008)

Machined red anodised aluminium cap lifts the most-handled service point on a Series 1 engine bay from functional to finished.

$60 inc GST

RX8 twist oil cap shown open beside its red anodised sealing section

AUTOEXE Oil Filler Cap (Twist Type) for Mazda RX8 (Series 2, 2009-2012)

Red anodised aluminium twist oil cap built for Series 2 filler points, adding a machined, purposeful look to a regularly handled engine-bay detail.

$60 inc GST

RX8 OEM fuel pump with white housing, top plate and blue outlet fitting

GENUINE MAZDA OEM Fuel Pump for Mazda RX8 (Series 2, 2009-2012)

Restores consistent fuel delivery and dependable cold starts with a factory-correct genuine Mazda replacement, covering Series 2 models from 2009 to 2012.

$490 inc GST

RX8 intake solenoid close-up showing black cylindrical body, bracket and upright vacuum port

GENUINE MAZDA OEM Intake Solenoid for Mazda RX8 (Series 1 & 2, 2003-2012)

Restores precise vacuum control in the RX8 intake system with a factory-new solenoid of known condition and guaranteed OEM fit.

$100 inc GST

RX8 MAF sensor shown loose with mounting bracket, connector and intake tube

GENUINE MAZDA OEM MAF Sensor for Mazda RX8 (Series 1 & 2, 2003-2012)

Restore accurate airflow measurement with factory calibration and confirmed OEM supply chain provenance. Suits all Mazda RX8 models, 2003-2012.

$200 inc GST

RX8 OEM thermostat shown loose with valve, spring and black sealing ring

GENUINE MAZDA OEM Thermostat for Mazda RX8 (Series 1 & 2, 2003-2012)

Restores factory coolant-flow control to the Renesis engine with a new genuine part, eliminating the uncertainty of an aged or used thermostat.

$30 inc GST

Mazda RX8 oil additive HKS ADD-II 200ml silver can with black cap

HKS ADD-II Engine Oil Additive 200ml for Mazda RX8 (Series 1 & 2, 2003-2012)

Organic molybdenum treatment that reduces friction and targets dry-start wear in the Renesis rotary. A considered addition to any RX8 oil service.

$45 inc GST

RX8 Renesis short motor on a pallet with front pulley and protective covers.

GENUINE MAZDA OEM Renesis Short Motor for Mazda RX8 (Series 2, 2009-2012)

A factory-new genuine Mazda engine assembly for Series 2 RX8 owners. Zero kilometres, built to OEM spec, with rotors, seals, flywheel, water pump and oil pan included.

$13,000 inc GST

RX8 Renesis short motor with exposed flywheel resting in a cardboard box

GENUINE MAZDA OEM Renesis Short Motor for Mazda RX8 (Series 1, 2003-2008)

Zero-kilometre RX8 Renesis short motor for Series 1 engine replacement, sourced direct from Mazda’s production line in Japan.

$13,000 inc GST

RX8 uprated starter motor product graphic showing silver housing, black body and pinion gear

ARD Advanced Power Starter Motor for Mazda RX8 (Series 1 & 2, 2003-2012)

Higher torque and faster cranking for every Renesis start. Addresses hot-start trouble and weak turnover across all 2003-2012 manual RX8 models.

$390 inc GST

Mazda RX8 150A alternator front view with red housing, pulley and connector on plastic packaging

ARD Advance High-Power 150A Alternator (Red) for Mazda RX8 (Series 1 & 2, 2003-2012)

Raises charging output from roughly 90A to 150A, giving accessory-heavy RX8 builds genuine electrical headroom and stable ignition voltage all the way to the redline.

$780 inc GST

RE Amemiya RX8 oil cooler visible through blue bumper intake beside fog light

RE-AMEMIYA Additional RHS Oil Cooler for Mazda RX8 (Series 1, 2003-2008)

Adds a dedicated right-hand-side oil cooler to Series 1 RX8s. Its GREDDY core is rated at 9,800 cal/h to protect the Renesis rotary during track sessions, sustained highway runs and hot-weather driving.

Original price was: $1,200.Current price is: $950. inc GST

RX8 accelerator controller harness, black module, switch and APEXi SMART box

APEXi Electronic SMART Accelerator Controller with Harness for Mazda RX8 (Series 1 & 2, 2003-2012)

Sharpen or soften throttle response without touching the ECU. The included plug-and-play harness fits every RX8 model across the full 2003-2012 run.

$110 inc GST

RX8 SE3P manual flywheel product graphic with AutoExe logo and red RX8

AUTOEXE Sports Flywheel for Mazda RX8 (Series 1 & 2, 2003-2012)

Chromoly flywheel weighing 5.5 kg versus the OEM 7.6 kg, cutting moment of inertia by 28% so the Renesis revs more freely and throttle response sharpens noticeably.

$800 inc GST

Four red Mazda RX8 ignition leads with black boots arranged on dark surface

AUTOEXE Sports Ignition Leads for Mazda RX8 (Series 1 & 2, 2003-2012)

Stainless steel core construction delivers strong conductance and low electrical noise to every plug, keeping spark quality consistent across the full rev range.

$290 inc GST

Close-up front label of black Mazda RX8 0W-30 oil metal tin

R-MAGIC Racing Energy Oil for NA Rotary 0W-30 5L for Mazda RX8 (Series 1 & 2, 2003-2012)

Ester-based, near-zero ash 0W-30 rotary engine oil in a 5L pack. It is formulated specifically for the Renesis to protect apex seals from cold start through sustained high-rpm use.

$190 inc GST

Mazda RX8 pulley kit blue pulleys installed with black belt and alternator

GREDDY TRUST Aluminium Pulley Kit for Mazda RX8 (Series 1, 2003-2008)

Swap the factory cast pulleys for machined duraluminium units. Less rotating mass, freer revving, and a blue engine-bay accent.

$270 inc GST

Mazda RX8 aluminium radiator close-up showing GReddy tank badge, welded neck and black cooling core

GREDDY TRUST Aluminium Racing Radiator TW-R for Mazda RX8 (Series 1, 2003-2008)

Full-aluminium 40mm core radiator that more than doubles OEM coolant capacity, drops heat by ~35%, and fits the SE3P without modification.

$730 inc GST

RX8 150A alternator front view showing blue housing, pulley and cooling vents

ARD Advance High-Power 150A Alternator (Blue) for Mazda RX8 (Series 1 & 2, 2003-2012)

Upgrades the RX8 charging system from the factory 90A unit to a rated 150A output. Keeps voltage stable under heavy electrical load with a blue anodised finish.

$780 inc GST

RX8 battery cover loose in black, front view with moulded horizontal detail

GENUINE MAZDA OEM Battery Cover for Mazda RX8 (Series 1 & 2, 2003-2012)

New genuine OEM battery cover restores factory terminal protection and clean engine bay presentation across the full 2003-2012 RX8 production run.

$90 inc GST

What owners are saying

RE-AMEMIYA Additional RHS Oil Cooler for Mazda RX8 (Series 1, 2003-2008) RE-AMEMIYA Additional RHS Oil Cooler for Mazda RX8 (Series 1, 2003-2008)

I have the oil cooler fitted recently Jarl, with a MazdaSpeed (RHS) oil cooler Try to get the MazdaSpeed or the US, Hong Kong or Japan spare parts. I suspect they are different but what the hell it is still an oil cooler. Japan does not have oil cooler in the Type S as standard but most people will have that as option. Certainly they mostly opted for the MazdaSpeed version of the oil cooler (btw it looks the same as the other one I have now ) There are many oil cooler available as an aftermarkey option, such as HKS and Fujita engineering, just to name two. They are very pricey and go over the $1000 mark. So I choose the $600 MazdaSpeed one instead. What you need is a garage, really. I will recommend changing oil and oil filter at the same time. It does mean a cleaner job. Make sure you take care of the joints and prepare for an oil leak (did have some on my installation). The right oil cooler gets the first of the oil from the central (engine) side and they travel to the left (stock) one before going back to central. There is a bass tube (as shown in the attachement above) to connect the right to the left oil cooler. Get a quote for $300 installation since it will take someone 6 hours to do (inc changing oil). Make sure they run the car for 10 minutes before putting the front bumper back up, just to see if there are still leaks. Result is amazing, central console is not hot anymore, well... it is cooler than what it has been. Say the temp in the cup holder used to be like the upper tray of the coffee machine (the area that warms the cup). Now it is like the keyboard of your laptop, still warm but certainly the house key I put in the cup holder will not burn my finger anymore. MazdaSpeed oil cooler is race proven. In BestMotoring, people raced for 20 minutes in the heat, MazdaSpeed oil cooler has a oil temp of 100 degree cel, but the S2K and Integra are running at 130 degree plus.

GENUINE MAZDA OEM Spark Plugs for Mazda RX8 (Series 1 & 2, 2003-2012) GENUINE MAZDA OEM Spark Plugs for Mazda RX8 (Series 1 & 2, 2003-2012)

I went ahead and replaced them on our 2014 Grand Touring AWD after almost 5 years and 60k miles. I know the manual says 75k miles but I figure it was time given the high compression ratio SkyActiv engines and the lots of stop and go seen by this car (my spouse's hour long city commute). I got the Mazda OEM plugs (PE5R-18-110) despite their high cost, given the experience of others on this forum. Very straightforward job: remove the cover, remove the bolts holding the ignition coils, unplug connector for each coil, and remove and replace plugs. After seeing them I'm glad I replaced them.

The Renesis 13B is one of the most rewarding engines ever fitted to a road car, and also one of the most demanding to rebuild correctly. An RX8 rotary engine rebuild is not a job where cutting corners pays off. The right parts, the right condition, and a clear plan before the first bolt comes loose are what separate a successful rebuild from an expensive repeat job. Finally, this range exists to support owners who are serious about getting it right.

Replacement or rebuild, choosing the right path

For owners considering a Mazda RX8 replacement engine, the critical questions are condition, history and what is included. For example, a known-condition engine with documented preparation gives you a reliable starting point and a predictable installation.

A used Mazda RX8 engine may carry a lower initial cost. However, undocumented history means unknown wear on apex seals, housings and the eccentric shaft. These are the components that determine how long the engine actually lasts. Therefore, weigh the full picture, not just the price.

A rotary rebuild involves sourcing components suited to the 13B’s unique requirements. Unlike a piston engine, the rotary’s sealing system and porting tolerances demand parts that meet correct specifications.

Moreover, genuine and quality aftermarket components are both represented here. Match the rebuild to your intended use: daily driver, weekend car or track-focused project.

The Renesis 13B, what makes this engine different

Every Renesis 13B engine Australia owner eventually learns the same lesson: the rotary rewards attention to detail and punishes neglect. For example, oil consumption is designed-in, not a fault. In addition, cooling system integrity matters more than on many engines. The apex seals are the heartbeat of the whole assembly. As a result, a proper RX8 rotary engine rebuild addresses all of these points, not just the obvious ones.

Rotary engine rebuild components to address

  • Apex seals and side seals: these are the wear items that define compression and ultimately engine life. Therefore, always replace with quality parts during a rebuild.
  • Housings and rotor condition: scoring or wear on the rotor housing faces determines whether the block is rebuildable. However, a replacement may be the more economical path if wear is significant.
  • Eccentric shaft: inspect carefully for wear and heat damage. In particular, check engines that have overheated or run low on oil.
  • Cooling and oiling system: a rebuild is the right time to address thermostat, water pump and oil metering pump condition. Because carrying over worn ancillaries into a fresh engine costs more later.

Planning a Mazda RX8 engine project in Australia

Owners looking to buy RX8 engine Australia-wide should treat the engine as one part of a broader project plan. The engine itself is the centre of the job. However, the installation also involves oil lines, coolant hoses, gaskets and ancillary components. Therefore, addressing these at the same time is straightforwardly better than returning to them six months later.

For a Mazda RX8 engine Australia project, sourcing is only part of the challenge. Also, have the right supporting parts ready before the engine goes in. That means gaskets and seals through to fresh fluids and service components.

Getting this right is what makes the difference between a clean installation and a drawn-out one. Meanwhile, browse the related categories for service items and supporting components, and plan the complete engine rebuild project from the start.

Frequently Asked Questions

What's the difference between rebuilding my RX8 engine and replacing it with a remanufactured or used unit?

A rebuild involves reconditioning your existing Renesis 13B around its known condition and your car's specific needs, which suits owners who want control over the scope of work. A replacement engine offers a more straightforward changeover but requires careful checking of the unit's condition, documented history and what components are included before committing.

What should I confirm before buying an RX8 replacement engine?

Confirm fitment compatibility, what supporting parts are included with the engine, and the documented condition or preparation history of the unit. Understanding what is and isn't included early prevents last-minute parts sourcing during installation and helps you budget the full project accurately.

Is a used RX8 engine a sensible option?

A used engine typically costs less upfront, but that saving needs to be weighed against the risk of unknown history and undisclosed wear. Engines with clear documentation of condition and prior maintenance carry significantly less risk than unverified units pulled from unknown-mileage vehicles.

What other parts should I plan for when doing an RX8 engine rebuild or replacement?

An engine project almost always involves more than the engine itself. Seals, apex seals, cooling system components, the oil metering pump, ignition parts and exhaust manifold gaskets are commonly addressed at the same time. Reviewing the full scope of surrounding service items before starting prevents the project stalling mid-way through.

Does the year or series of my RX8 affect which engine or rebuild parts I need?

Yes. Series 1 (2003-2008) and Series 2 (2009-2011) RX8 models can have differences in supporting components and ancillaries around the Renesis 13B engine. Confirming your exact build date and series before selecting an engine or rebuild parts ensures correct fitment and avoids compatibility issues during installation.

Is the Renesis 13B engine still available new from Mazda in Australia?

Genuine new Renesis 13B engines are not a standard stocked item through Mazda Australia and availability of genuine engine assemblies has become increasingly limited over time. Owners should confirm current availability early in their planning rather than assuming supply is straightforward.

Can I keep driving my RX8 while planning an engine rebuild, or does the engine need to come out immediately?

That depends entirely on the nature and severity of the engine's issue. Minor oil consumption or a slight power loss may allow limited use while parts are sourced, but symptoms such as flooding, loss of compression or coolant contamination generally mean the engine should not be run until the rebuild is completed. Assess your engine's specific condition before making that call.