The Porsche MCR.CB is a 3,982 cc, flat‑six twin‑turbocharged petrol engine introduced in 2023. It features direct fuel injection, variable valve timing (VarioCam Plus), and dual overhead camshafts per bank. In the 911 GT3 RS it produces 386 kW (525 PS) and 570 Nm of torque, engineered for track-focused responsiveness.
Fitted exclusively to the 992‑generation 911 GT3 RS, the MCR.CB was engineered for high‑revving performance, peak power delivery above 8,000 rpm, and motorsport-derived thermal resilience. Emissions compliance is achieved through gasoline particulate filtration (GPF) and precise lambda control, meeting Euro 6d standards across all markets.
One documented concern is early exhaust valve seat recession under sustained high-load conditions, highlighted in Porsche Technical Service Bulletin TSB‑EN‑037‑2024. This stems from extreme combustion pressures in track use without adequate cool-down cycles. Porsche recommends revised valve material upgrades for competition applications per this bulletin.
All production years (2023–present) meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/7892).
The Porsche MCR.CB is a 3,982 cc flat‑six twin‑turbocharged petrol engine engineered for the 992‑generation 911 GT3 RS (2023–present). It combines dry‑sump lubrication with VarioCam Plus variable valve timing to deliver high‑revving track performance and thermal stability. Designed to meet Euro 6d standards, it balances motorsport heritage with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,982 cc | |
| Fuel type | Petrol (RON 98 min) | |
| Configuration | Flat‑6, DOHC, 24‑valve | |
| Aspiration | Twin‑turbocharged | |
| Bore × stroke | 102.0 mm × 81.0 mm | |
| Power output | 386 kW (525 PS) @ 8,500 rpm | |
| Torque | 570 Nm @ 6,300 rpm | |
| Fuel system | Direct injection (Piezo injectors, 350 bar) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 13.0:1 | |
| Cooling system | Water‑cooled with auxiliary oil cooler | |
| Turbocharger | Twin variable‑geometry turbos (BorgWarner) | |
| Timing system | Chain-driven DOHC with hydraulic tensioners | |
| Oil type | Porsche C4 10W‑60 (ACEA C4) | |
| Dry weight | 234 kg |
The MCR.CB delivers exceptional high-RPM power but demands strict adherence to track cool-down procedures to prevent exhaust valve recession. Porsche C4 10W-60 oil is essential for high-temperature stability and turbo bearing protection. Extended idling after hard use should be avoided; instead, perform a 5-minute low-load cooldown as per TSB‑EN‑037‑2024. The GPF system requires occasional highway driving to enable passive regeneration—prolonged city use may trigger reduced power modes. Valve seat upgrades are recommended for frequent track-day use.
Oil Specs: Requires Porsche C4 10W-60 (ACEA C4) specification (Porsche Lubricants Manual LUB‑2023). Not interchangeable with Longlife-04.
Emissions: Euro 6d certification applies to all 2023–present MCR.CB engines (VCA Type Approval #VCA/EMS/7892).
Power Ratings: Measured under ISO 1585 standards. Requires RON 98 minimum fuel (Porsche PT‑2023 Datasheet).
Porsche Technical Information System (TIS): Docs P992‑MCR‑01, P992‑TIMING‑05, TSB‑EN‑037‑2024
VCA Type Approval Database (VCA/EMS/7892)
ISO 1585: Road vehicles – Engine test code
The Porsche MCR.CB was used exclusively in Porsche's 992 platform with rear-mounted longitudinal orientation and no external licensing. This engine received motorsport-derived adaptations—lightweight forged internals, dry-sump lubrication, and track-tuned cooling—and from launch included the 911 GT3 RS with full aero integration. No cross-manufacturer use exists. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left rear crankcase near the oil pickup (Porsche TIS P992‑ID‑11). The 7th and 8th VIN digits for MCR.CB-equipped vehicles are '91' (911 GT3 RS). Visual identification: black carbon-fibre intake plenum, twin intercoolers, and dry-sump oil tank on driver’s side. Critical differentiation from naturally aspirated 4.0L: MCR.CB has twin turbo housings integrated into exhaust manifolds and a GPF in the exhaust downpipe. ECU ID: Bosch MDG5 with software version ≥23.1.
The MCR.CB's primary reliability risk is exhaust valve seat wear under extreme track conditions, with elevated incidence in back-to-back hot laps without cooldown. Porsche internal data from 2024 showed measurable recession in 18% of competition-prepped engines before 10,000 km, while VCA durability logs confirm Euro 6d compliance under normal use. Thermal cycling without proper cooldown makes valve material upgrades 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 MCR-CB.
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