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 mo…
All production years (2023–present) meet Euro 6d emissions standards .
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 | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 234 kg |
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.
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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 manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The MCR.CB is robust under normal or occasional track use, but sustained high-load operation without cooldown risks exhaust valve wear. Porsche’s 2024 bulletin recommends upgraded valves for competition. With proper maintenance—especially oil changes every 10,000 km and cooldown discipline—longevity is excellent.
Key issues include exhaust valve seat recession under track stress, GPF clogging in urban use, turbo oil coking from hot shutdowns, and dry-sump pressure anomalies during high-G cornering. All are documented in Porsche TSB‑EN‑037‑2024 and service manuals.
The MCR.CB is exclusive to the 2023–present 992-generation 911 GT3 RS. No other Porsche or external manufacturer uses this engine. It is not found in standard GT3, Turbo, or Carrera variants.
Aftermarket ECU tuning is common on the MCR-CB platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Official combined figure is 11.8 L/100km (~24 mpg UK). Real-world mixed driving yields 13–16 L/100km (18–22 mpg UK), while track use can exceed 30 L/100km. Requires RON 98 minimum; RON 100 recommended for performance driving.
Yes. Like all modern Porsche flat-six engines, the MCR.CB is an interference design. Timing system failure (though rare due to chain design) could cause piston-to-valve contact and catastrophic damage.
Porsche specifies 10W-60 synthetic oil meeting Porsche C4 (ACEA C4) standard. Brand-approved examples include Mobil 1 ESP 10W-60 or Porsche-branded equivalent. Change interval is 10,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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