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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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RX8 ignition coil set single black coil in front of four Mazda boxes

GENUINE MAZDA OEM Ignition Coils Complete Set (N3H1-18-100C x 4) for Mazda RX8 (Series 1 & 2, 2003-2012)

Restore consistent spark across every rotor position with a matched set of four genuine Mazda N3H1-18-100C coils, the latest revision used in RX8 GT, R3 and Spirit R models.

$390 inc GST

GENUINE MAZDA OEM MT Engine Mount Set for Mazda RX8 (Series 1 & 2, 2003-2012)

New genuine Mazda engine mounts restore factory drivetrain support in manual RX8s, keeping engine movement controlled and shift feel consistent.

$390 inc GST

Several RX8 oil dipstick units in clear sleeves with yellow loop handles on carpet

GENUINE MAZDA OEM Oil Dipstick for Mazda RX8 (Series 1, 2003-2008)

Restore clear engine-oil checks on a Series 1 rotary with a new genuine Mazda RX8 oil dipstick, replacing a bent, faded or unreadable original.

$110 inc GST

RX8 Series 2 oil dipstick pair in clear protective sleeves on black carpet

GENUINE MAZDA OEM Oil Dipstick for Mazda RX8 (Series 2, 2009-2012)

New OEM oil dipstick restores clear, accurate oil-level checks on Series 2 cars. A known-condition genuine part, not a used unknown.

$110 inc GST

Sealed RX8 radiator hose set showing a curved black hose in Mazda packaging

GENUINE MAZDA OEM Radiator Hose Replacement Set for Mazda RX8 (Series 1 & 2, 2003-2012)

Replace ageing coolant hoses with factory-correct rubber. This RX8 radiator hose set covers all three main connections in one purchase.

$150 inc GST

Mazda RX8 radiator sub tank front view with hose and electrical connector

GENUINE MAZDA OEM Radiator Sub-Tank (Revision C) for Mazda RX8 (Series 1 & 2, 2003-2012)

Replace an ageing or cracked coolant overflow bottle with Mazda’s own Revision C reservoir, supplied with its matching OEM cap. Restores factory-correct overflow containment across every RX8 from 2003 to 2012.

$250 inc GST

Closed genuine Mazda RX8 spark plugs box viewed from above on wooden table

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

Fresh OEM leading and trailing plugs restore correct Renesis ignition, addressing hard starts, rough idle and overdue plug services on all RX8 models.

$290 inc GST

RX8 V-belt kit with loose Mazda-labelled belt beside sealed packaged belt

GENUINE MAZDA OEM Waterpump/Alternator and Airconditioning V-Belt Kit for Mazda RX8 (Series 1, 2003-2008)

Replace all three accessory drive belts on Series 1 models with factory-correct genuine Mazda components, restoring reliable drive to the water pump, alternator and air conditioning circuits.

$120 inc GST

RX8 Series 2 belt kit showing loose Mazda V-belt beside packaged belt

GENUINE MAZDA OEM Waterpump/Alternator and Airconditioning V-Belt Kit for Mazda RX8 (Series 2, 2009-2012)

Replace worn accessory belts with factory-matched components. This RX8 Series 2 belt kit covers the water pump, alternator and air conditioning drives.

$120 inc GST

RX8 radiator cap upgrade fitted to yellowed coolant reservoir below black airbox

APEXi High Pressure High Temp Radiator Cooling Cap for Mazda RX8 (Series 1 & 2, 2003-2012)

Raises coolant boiling point by increasing system pressure, giving the RX8 cooling system real headroom against localised boiling under load.

$40 inc GST

RX8 large capacity oil pan with ribbed silver cover and mounting hardware

GREDDY TRUST Large Capacity Oil Pan for Mazda RX8 (Series 1, 2003-2008)

Adds 1 litre of oil capacity and integrated cooling fins to keep the Renesis lubricated and cooler under hard driving.

$488 inc GST

Blue RX8 oil filter OX-02 beside upright GREDDY TRUST retail box

GREDDY TRUST Oil Filter for Mazda RX8 (Series 1, 2003-2008)

Double-pleated filter media captures more particulate across the full service interval, giving your Renesis a clean, known-condition start every oil change.

$25 inc GST

Front close-up of blue GREDDY RX8 oil filter marked OX-05 against boxed filters

GREDDY TRUST Oil Filter for Mazda RX8 (Series 2, 2009-2012)

Double-pleated filter paper expands media area for superior oil cleanliness across every service interval on the Series 2 Renesis.

$25 inc GST

RX8 magnetic sump plug with GReddy black hex head, threaded body and separate sealing washer

GREDDY TRUST Super Magnetic Oil Pan Sump Plug for Mazda RX8 (Series 1 & 2, 2003-2012)

A 5000 gauss neodymium magnet intercepts fine ferrous debris at every oil change, protecting Renesis apex seals and bearings between service intervals.

$70 inc GST

RX8 big bore throttle front view showing gold butterfly plate and black actuator housing

ODULA BIG-BORE Throttle Body for Mazda RX8 (Series 1 & 2, 2003-2012)

Widens the intake passage by approximately 2 mm for sharper throttle response across the rev range. A strong addition to any intake build.

$750 inc GST

RX8 intake manifold protector installed beneath intake runners with curved metal pipe passing through cut-out

ODULA Intake Manifold Heat Protector for Mazda RX8 (Series 1 & 2, 2003-2012)

Japanese-made heat shield blocking radiant heat from the intake manifold. Essential when an aftermarket exhaust manifold is fitted.

$120 inc GST

RX8 OMP heat shield installed vertically beside oil metering pump and wiring

ODULA Oil Metering Pump Heat Shield for Mazda RX8 (Series 1, 2003-2008)

Stainless steel barrier mounts between the exhaust manifold and OMP, shielding a critical lubrication component from damaging radiant heat.

$110 inc GST

Four red R Magic RX8 coil pack units aligned inside an open cardboard box

R-MAGIC Power Coil Pack for Mazda RX8 (Series 1 & 2, 2003-2012)

A multi-spark RX8 coil pack delivering 46% more output than OEM, restoring clean starts and sharpening torque across the full rev range.

$1,050 inc GST

RX8 high flow water pump comparison showing silver factory and black R-Magic impellers

R-MAGIC Super High Flow Water Pump for Mazda RX8 (Series 1, 2003-2008)

A redesigned impeller improves coolant circulation in Series 1 RX8s, reducing cavitation and supporting a thorough cooling-system refresh.

$490 inc GST

Mazda RX8 silicone hoses sealed in clear Samco retail packaging

SAMCO Silicone Coolant Hose Set for Mazda RX8 (Series 1 & 2, 2003-2012)

Replace every primary coolant line at once with a six-piece silicone kit, handmade in the UK to a stated 170°C rating.

$590 inc GST

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What owners are saying

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

I've gone through a Walbro and now a DW200 and still the same problems. THE DIFINITIVE FIX FOR FUEL CUT ON HIGH G LEFTS AND ANY RANDOM LOSS OF FUEL PRESSURE IN A LOWER END HP BOOSTED, STREET, LIGHT TRACK DUTY CAR IS TO ONLY USE A BRAND NEW SLIGHTLY MODDED TO FIT SERIES 2 FUEL PUMP ASSEMBLY. DO NOT PUT HIGH FLOW PUMPS IN A SERIES 1 ASSEMBLY IT DOES NOT WORK. I HAVE DONE IT TWICE NOW AND IT STILL DOESN'T WORK! SERIES 2 OEM Fuel Pump Assembly part no. N3R1-13-35Z Some Modifications to fit in a Series 1 fuel tank is required.

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.