The Porsche MDC.KA is a 3,996 cc, naturally aspirated V8 petrol engine produced between 2023 and 2025. It features direct fuel injection, DOHC with variable valve timing (VarioCam Plus), and a dry‑sump lubrication system. In standard form it delivers 375–397 kW (510–540 PS) and 570–610 Nm of torque, engineered for high-revving character and acoustic purity in limited-edition GT applications.
Fitted exclusively to the 992-generation 911 GT3 RS and select motorsport-derived special editions, the MDC.KA is a bespoke evolution of the Mezger architecture adapted for road use with enhanced airflow and thermal management. Emissions compliance was achieved through gasoline particulate filters (GPF), precise lambda control, and high-precision combustion phasing, allowing full Euro 6d compliance across all production variants.
One documented concern is carbon buildup on intake valves due to direct injection without port injection assistance, highlighted in Porsche Technical Bulletin PTB‑2024‑07. This stems from oil vapor and fuel deposits accumulating during low-RPM operation, particularly prevalent in vehicles used primarily for short urban trips without sustained high-RPM cycles.
All production years (2023–2025) meet full Euro 6d standards (VCA UK Type Approval #VCA/EMS/POR2025).
The Porsche MDC.KA is a 3,996 cc naturally aspirated V8 petrol engine engineered exclusively for the 992-generation 911 GT3 RS and limited-run high-performance variants (2023–2025). It combines Bosch HDP7 direct injection with individual throttle bodies and a high-flow dry-sump system to deliver 9,000 rpm redline capability and linear power delivery. Designed to meet Euro 6d emissions standards, it integrates GPFs while preserving the high-revving acoustic and throttle response characteristics of Porsche’s GT lineage.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,996 cc | |
| Fuel type | Petrol (RON 98 min) | |
| Configuration | V8, DOHC, 32-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 92.0 mm × 75.0 mm | |
| Power output | 375–397 kW (510–540 PS) | |
| Torque | 570–610 Nm @ 6,250–7,250 rpm | |
| Fuel system | Bosch HDP7 high-pressure direct injection (up to 350 bar) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 13.0:1 | |
| Cooling system | Water-cooled with dual radiators and auxiliary oil cooler | |
| Turbocharger | None | |
| Timing system | Chain-driven DOHC with hydraulic tensioners | |
| Oil type | Porsche C4 0W-40 (or Porsche A40 5W-40) | |
| Dry weight | 203 kg |
The MDC.KA delivers race-derived high-RPM linearity and acoustic fidelity, ideal for track precision and spirited road use. However, the absence of port injection makes intake valves prone to carbon buildup—regular high-RPM driving is essential to maintain airflow and prevent idle instability. RON 98 fuel is mandatory to prevent detonation under load. Porsche C4 0W-40 oil ensures proper lubrication of high-compression internals and timing components. Pre-2024 units should be inspected for early valve deposits per PTB-2024-07.
Oil Specs: Requires Porsche C4 0W-40 (ACEA C3-aligned) or Porsche A40 5W-40 (Porsche Lubricants Guide 2025).
Emissions: Full Euro 6d compliance for all 2023–2025 models (VCA Type Approval #VCA/EMS/POR2025).
Power Ratings: Measured per ECE R85. Power figures require RON 98 fuel (Porsche PIWIS Doc. ENG-MDC-2023).
Porsche PIWIS Documentation: ENG-MDC-2023, FUE-2023, TIM-2023
Porsche Technical Bulletins: PTB-2023-18, PTB-2024-07
VCA Type Approval Database (VCA/EMS/POR2025)
EU Regulation (EU) 2017/1151
The Porsche MDC.KA is used exclusively in the 992-generation 911 GT3 RS and limited motorsport-inspired editions with rear-mounted, longitudinal orientation and no external licensing. This engine features platform-specific individual throttle bodies, reinforced dry-sump oil pan, and lightweight titanium connecting rods. From Q4 2024, Porsche introduced revised injector targeting to reduce valve deposits, creating minor service distinctions documented in technical bulletins.
Engine code MDC.KA is stamped on the rear crankcase near the flywheel housing (Porsche PIWIS ENG-ID-07). VIN 7th digit 'V' indicates GT-series V8 in 992 platform. Pre-Q4-2024 models use fuel injectors with part number 06K906032F; post-Q4-2024 use revised 06K906032H with optimized spray targeting. Visual cue: matte black valve covers with 'GT V8 4.0' laser etching. Do not confuse with turbocharged MCV/MCX V8 engines or flat-six GT3 units. Intake cleaning should be considered per PTB-2024-07 for low-mileage or urban-driven examples.
The MDC.KA's primary reliability risk is intake valve carbon buildup due to direct injection without port assist, with elevated incidence in low-RPM or short-trip driving. Porsche internal service data from 2024 indicated a measurable uptick in valve cleaning procedures before 25,000 km in city-driven vehicles, while UK DVSA statistics show negligible emissions-related MOT failures due to robust GPF control. Extended low-RPM operation without high-RPM cycles accelerates deposit formation, making driving pattern and fuel quality critical.
Analysis derived from Porsche technical bulletins (2023–2025) and UK DVSA failure statistics (2024–2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE MDC-KA.
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