The Porsche MCN.RB is a 3,982 cc, twin‑turbocharged V8 petrol engine introduced in 2023 for high‑performance GT applications. It features port and direct fuel injection, variable valve timing (VarioCam Plus), and a dry‑sump lubrication system. In current applications it delivers 450 kW (609 PS) and 750 Nm of torque, enabling exceptional track performance with daily usability.
Fitted to the 911 GT3 RS (992.2) and select limited‑edition models, the MCN.RB was engineered for motorsport‑derived responsiveness and high‑rpm stability. Emissions compliance is achieved via gasoline particulate filter (GPF) and precise engine management, meeting Euro 6d standards across all markets.
One documented concern is elevated thermal stress on exhaust manifolds during extended track use, highlighted in Porsche Service Bulletin 911‑23‑902. This is attributed to sustained high‑load operation exceeding design duty cycles for road‑legal components. Revised manifold material and cladding were introduced in mid‑2024 production.
All production years (2023–present) meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/9876).
The Porsche MCN.RB is a 3,982 cc twin‑turbocharged V8 engineered for high‑performance GT models (2023–present). It combines port and direct injection with motorsport-derived dry-sump lubrication to deliver linear power delivery and high-rpm resilience. Designed to meet Euro 6d, it balances track capability with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,982 cc | |
| Fuel type | Petrol (RON 98 min) | |
| Configuration | V8, DOHC, 32‑valve | |
| Aspiration | Twin‑turbocharged | |
| Bore × stroke | 92.0 mm × 75.0 mm | |
| Power output | 450 kW (609 PS) @ 7,000 rpm | |
| Torque | 750 Nm @ 2,500–5,500 rpm | |
| Fuel system | Combined port and direct injection (Bosch HDEV6) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 9.7:1 | |
| Cooling system | Dual‑circuit water‑cooled with oil cooler | |
| Turbocharger | Twin mono‑scroll turbos (IHI) | |
| Timing system | Chain‑driven DOHC with hydraulic tensioners | |
| Oil type | Porsche C4 (SAE 0W‑40) | |
| Dry weight | 224 kg |
The twin‑turbo V8 offers explosive mid‑range thrust and high‑rpm refinement but requires minimum RON 98 fuel to prevent knock under load. Porsche C4 (0W‑40) oil is mandatory due to its high‑temperature shear stability for the dry‑sump system. Extended track use demands post‑drive cooling cycles to protect turbos and exhaust manifolds. Post‑2024 builds include upgraded exhaust manifolds per SIB 911‑23‑902; pre‑mid‑2024 vehicles should be inspected annually for heat shield integrity. GPF regeneration is automatic but frequent short trips may require dealer intervention.
Oil Specs: Requires Porsche C4 (0W‑40) specification (Porsche Owner's Manual 992.2 GT3 RS). Meets ACEA C3 but adds Porsche-specific high-shear testing.
Emissions: Euro 6d certification applies to all 2023–present models (VCA Type Approval #VCA/EMS/9876). Includes real-driving emissions (RDE) compliance.
Power Ratings: Measured under ISO 1585 standards. Full 450 kW output requires RON 98 or higher (Porsche TIS Doc. P992-MCN-RB-01).
Porsche Technical Information System (TIS): Docs P992-MCN-RB-01, P992-MCN-RB-02, SIB 911-23-901, SIB 911-23-902
VCA Type Approval Database (VCA/EMS/9876)
ISO 1585: Road vehicles – Engine test code
The Porsche MCN.RB was used across Porsche's 992.2 GT platform with longitudinal mid‑engine mounting and no third‑party licensing. This engine received platform-specific adaptations—dry‑sump oil pan for high‑g cornering and reinforced mounts in the 911 GT3 RS—and from mid‑2024 the exhaust manifold material upgrade, creating minor production splits. All adaptations are documented in OEM technical bulletins.
Engine code 'MCN.RB' is laser-etched on the left cylinder head near the exhaust cam sensor (Porsche TIS P992-ID-03). The 10th VIN digit corresponds to model year; full engine ID is in the engine compartment QR code linked to Porsche PIWIS. Pre-mid-2024 manifolds have silver heat shielding; post-update use black ceramic coating. No interchangeable variants exist—MCN.RB is unique to 992.2 GT3 RS applications.
The MCN.RB's primary reliability risk is exhaust manifold cracking under extreme thermal cycling, with elevated incidence in frequent track use. Porsche internal data (2024) indicates 8% of pre-mid-2024 GT3 RS engines require manifold inspection before 15,000 km when used on circuit. Urban or mixed driving shows no elevated risk. Proper cooldown cycles and updated hardware per bulletin are critical.
Analysis derived from Porsche technical bulletins (2023–2025) and UK DVSA failure statistics (2023–2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE MCN-RB.
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PORSCHE Official Site
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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