The Porsche MDC.HA is a 3,982 cc, naturally aspirated flat‑6 petrol engine introduced in 2024 for the 911 GT3 (992.2). It features port and direct fuel injection (PD‑FI), variable valve timing (VarioCam Plus), and a motorsport-derived dry‑sump lubrication system. In current applications it delivers 386 kW (525 PS) and 465 Nm of torque, with a redline of 9,000 rpm, enabling exceptional throttle response and high‑rev stability.
Fitted exclusively to the 911 GT3 (992.2), the MDC.HA builds on Porsche’s legacy of high‑revving naturally aspirated engines, optimized for both track precision and road compliance. Emissions compliance is achieved via a gasoline particulate filter (GPF), precise lambda control, and engine management calibrated to meet Euro 6d standards across all markets.
One documented concern is elevated valve train noise during cold starts in early production, highlighted in Porsche Service Bulletin 911‑24‑108. This behavior is attributed to hydraulic valve lifter bleed‑down under low‑temperature conditions and does not indicate mechanical wear. From Q2 2025, Porsche implemented revised lifter pre‑fill logic and updated cam profile phasing.
All production years (2024–present) meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/9882).
The Porsche MDC.HA is a 3,982 cc naturally aspirated flat‑6 engineered for high‑performance GT applications (2024–present). It combines port and direct injection with a dry‑sump system to deliver linear power delivery and exceptional high‑rpm refinement. Designed to meet Euro 6d, it balances analog driving engagement with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,982 cc | |
| Fuel type | Petrol (RON 98 min) | |
| Configuration | Flat‑6, DOHC, 24‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 102.0 mm × 81.0 mm | |
| Power output | 386 kW (525 PS) @ 8,400 rpm | |
| Torque | 465 Nm @ 6,300 rpm | |
| Fuel system | Combined port and direct injection (Bosch HDEV6) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 13.3:1 | |
| Cooling system | Dual‑circuit water‑cooled with integrated oil cooler | |
| Turbocharger | None | |
| Timing system | Chain‑driven DOHC with hydraulic tensioners | |
| Oil type | Porsche C4 (SAE 0W‑40) | |
| Dry weight | 197 kg |
The naturally aspirated flat‑6 delivers unmatched linearity and a 9,000 rpm redline but requires minimum RON 98 fuel to prevent knock at elevated loads. Porsche C4 (0W‑40) oil is essential for dry‑sump operation and high‑temperature valve train stability. Early builds (pre-Q2-2025) may exhibit cold-start valve train ticking due to hydraulic lifter bleed-down below 10°C; this is non-damaging but addressed in later software. Revised lifter logic per SIB 911‑24‑108 mitigates this. GPF regeneration is passive but frequent short trips may require occasional highway driving to complete cycles.
Oil Specs: Requires Porsche C4 (0W‑40) specification (Porsche Owner's Manual 992.2 GT3). Meets ACEA C3 with Porsche-specific high-shear stability requirements.
Emissions: Euro 6d certification applies to all 2024–present models (VCA Type Approval #VCA/EMS/9882). Includes real-driving emissions (RDE) compliance.
Power Ratings: Measured under ISO 1585 standards. Full 386 kW output requires RON 98 or higher (Porsche TIS Doc. P992-MDC-HA-01).
Porsche Technical Information System (TIS): Docs P992-MDC-HA-01, P992-MDC-HA-02, SIB 911-24-108
VCA Type Approval Database (VCA/EMS/9882)
ISO 1585: Road vehicles – Engine test code
The Porsche MDC.HA was developed exclusively for Porsche's 992.2 GT platform with longitudinal rear‑mounting and no third‑party licensing. This engine received motorsport-derived adaptations—including lightweight titanium connecting rods, high‑lift camshafts, and a dry‑sump system with seven scavenge pumps—in the 911 GT3. From Q2 2025, hydraulic lifter control logic was updated to reduce cold‑start noise, creating minor production splits. All adaptations are documented in OEM technical bulletins.
Engine code 'MDC.HA' is laser-etched on the rear crankcase near the flywheel housing (Porsche TIS P992-ID-12). The 10th VIN digit corresponds to model year; full engine ID is encoded in the QR label on the left strut tower linked to Porsche PIWIS. Pre-Q2-2025 engines use lifter control map version 3.7; post-update units use version 3.9 with revised pre-fill timing. No other Porsche models use this engine code.
The MDC.HA's primary consideration is transient hydraulic lifter noise during cold starts in pre‑Q2‑2025 engines, with internal Porsche quality data (2024) indicating customer reports in 9% of vehicles operated below 10 °C ambient. No mechanical wear correlation was found, and the noise typically resolves within 2–3 seconds of startup. The revised ECU calibration eliminates unnecessary concern while preserving the engine’s high‑revving integrity.
Analysis derived from Porsche technical bulletins (2024–2025) and UK DVSA failure statistics (2024–2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE MDC-HA.
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