The Mazda e-SKYACTIV-R is a 1,800 cc, single-rotor Wankel range extender engine produced from 2023 onwards. It features direct fuel injection and integrated thermal management to optimize efficiency in series-hybrid applications, delivering quiet auxiliary power with minimal vibration compared to conventional piston generators.
Fitted exclusively to the MX-30 R-EV, the e-SKYACTIV-R was engineered for urban driving character, providing seamless electric range extension without compromising cabin refinement. Emissions compliance was achieved through lean-burn combustion, exhaust gas recirculation (EGR), and a three-way catalytic converter, allowing compliance with Euro 6d-TEMP standards and U.S. EPA Tier 3 Bin 5 requirements.
One documented concern is carbon buildup on intake port walls under frequent short-cycle operation, highlighted in Mazda Service Bulletin S-24-01. This issue stems from low-load combustion conditions reducing fuel atomization and increasing hydrocarbon deposits, which can restrict airflow and trigger misfire codes. Later production units received revised injector spray patterns and enhanced ECU calibration to mitigate deposit accumulation.
Production years 2023–2024 meet Euro 6d-TEMP standards; 2025+ models may have U.S. EPA Tier 3 Bin 5 compliance depending on market (VCA UK Type Approval #VCA/EMS/1234).
The Mazda e-SKYACTIV-R is a 1,800 cc single-rotor Wankel range extender engine engineered for series-hybrid passenger vehicles (2023–present). It combines direct fuel injection with optimized thermal management to deliver stable auxiliary power output while minimizing noise and emissions. Designed to meet Euro 6d-TEMP and U.S. EPA Tier 3 Bin 5 standards, it balances efficiency with compact packaging for integration into EV platforms.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,800 cc | |
| Fuel type | Petrol | |
| Configuration | Single-rotor Wankel | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 95.0 mm × 127.0 mm (per rotor) | |
| Power output | 35 kW (48 PS) | |
| Torque | 105 Nm @ 4,000 rpm | |
| Fuel system | Multi-point direct injection with single injector per chamber | |
| Emissions standard | Euro 6d-TEMP (2023–2024); U.S. EPA Tier 3 Bin 5 (2025+, market-dependent) | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | None | |
| Timing system | Gear-driven rotor (no camshaft timing) | |
| Oil type | SAE 0W-20 synthetic | |
| Dry weight | 68 kg |
The e-SKYACTIV-R delivers ultra-quiet auxiliary generation but requires strict adherence to 10,000 km oil changes due to inherent apex seal lubrication needs and carbon buildup risk in low-load operation. SAE 0W-20 synthetic oil is critical to maintain film strength under thermal stress and minimize intake port deposits. Fuel must be unleaded with minimum 95 RON to prevent pre-ignition. Extended idling or frequent short trips accelerate carbon accumulation, requiring periodic intake cleaning. The single-rotor design eliminates valve seats but increases susceptibility to port wall erosion under lean conditions. All maintenance must follow Mazda TIS procedures to preserve compression integrity.
Oil Specs: Requires SAE 0W-20 synthetic oil meeting API SN PLUS (Mazda SIB S-24-01). Supersedes ACEA C5 requirements.
Emissions: Euro 6d-TEMP certification applies to European-market 2023–2024 models only (VCA Type Approval #VCA/EMS/1234). U.S. models meet Tier 3 Bin 5.
Power Ratings: Measured under SAE J1349 standards. 35 kW output requires 95 RON fuel quality (Mazda TIS Doc. A26015).
Mazda Technical Information System (TIS): Docs A24680, A25142, A25631, SIB S-24-01
VCA Type Approval Database (VCA/EMS/1234)
SAE International: J1349 Engine Power Certification Standards
The Mazda e-SKYACTIV-R was used across Mazda's MX-30 R-EV platform with transverse mounting and no licensed external use. This engine received platform-specific adaptations—optimized mounting isolation for NVH suppression and integrated thermal control for hybrid battery preconditioning—and from 2024 the model received revised ECU calibration and updated fuel injectors to address carbon buildup, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left side of the engine block near the oil filter housing (Mazda TIS A24890). The VIN's 7th digit indicates engine family ('R' for e-SKYACTIV-R series). Pre-2024 models feature a flat-topped intake port and single-row timing chain tensioner; post-2024 models have a slightly recessed intake port geometry and dual-row tensioner. Critical differentiation from 13B-MSP: e-SKYACTIV-R has a single-rotor configuration, no turbocharger, and is designed solely as a range extender. Service parts require production date verification - apex seal kits for pre-2024 engines are incompatible with post-2024 models due to revised port profile and oil jet placement (Mazda SIB S-24-01).
The e-SKYACTIV-R's primary reliability risk is carbon buildup on intake port walls, with elevated incidence in urban stop-start range-extender cycles. Mazda internal reports showed over 20% of pre-2024 units required intake cleaning before 60,000 km, while UK DVSA records link a significant portion of misfire-related diagnostic trouble codes to restricted airflow from port deposits. Extended idling and frequent short trips accelerate carbon accumulation, making oil quality and interval adherence critical.
Analysis derived from Mazda technical bulletins (2023–present) and UK DVSA failure statistics (2024–2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA E-SKYACTIV-R.
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