The Porsche MDG.GA is a 4,194 cc, naturally aspirated flat‑6 petrol engine introduced in 2024 for the 911 S/T (992.2). It features port and direct fuel injection (PD‑FI), variable valve timing (VarioCam Plus), and a lightweight dry‑sump lubrication system derived from motorsport applications. In current applications it delivers 386 kW (525 PS) and 465 Nm of torque, with a redline of 8,400 rpm, blending track‑ready responsiveness with analogue driving engagement.
Fitted exclusively to the limited‑production 911 S/T (992.2), the MDG.GA merges GT3‑level internals with Carrera‑inspired drivability, emphasizing driver involvement over outright power. 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 spring resonance under sustained high‑rpm operation, highlighted in Porsche Service Bulletin 911‑24‑115. This behavior is linked to early‑batch valve springs exhibiting harmonic instability above 8,000 rpm during extended track use. From Q3 2024, Porsche implemented revised spring metallurgy and updated valve train damping.
All production years (2024–present) meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/9883).
The Porsche MDG.GA is a 4,194 cc naturally aspirated flat‑6 engineered for high‑revving, driver‑focused applications (2024–present). It combines port and direct injection with a lightweight dry‑sump system to deliver linear power and exceptional throttle fidelity. Designed to meet Euro 6d, it balances emissions compliance with raw mechanical engagement in the 911 S/T platform.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 4,194 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 oil cooler | |
| Turbocharger | None | |
| Timing system | Chain‑driven DOHC with hydraulic tensioners | |
| Oil type | Porsche C4 (SAE 0W‑40) | |
| Dry weight | 193 kg |
The naturally aspirated flat‑6 delivers exceptional throttle linearity and a high‑revving character but requires minimum RON 98 fuel to prevent knock under load. Porsche C4 (0W‑40) oil is essential for dry‑sump operation and valve train stability at 8,400 rpm. Extended track use above 8,000 rpm may induce valve spring resonance in pre‑Q3‑2024 builds. Revised springs introduced in mid‑2024 resolve this; earlier engines should avoid sustained 8k+ rpm operation or consider upgrade per SIB 911‑24‑115. 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 S/T). 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/9883). 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-MDG-GA-01).
Porsche Technical Information System (TIS): Docs P992-MDG-GA-01, P992-MDG-GA-02, SIB 911-24-115
VCA Type Approval Database (VCA/EMS/9883)
ISO 1585: Road vehicles – Engine test code
The Porsche MDG.GA was developed exclusively for Porsche's 992.2 S/T platform with longitudinal rear‑mounting and no third‑party licensing. This engine received motorsport-derived adaptations—including lightweight forged pistons, high‑lift camshafts, and a dry‑sump system with reduced oil capacity for weight savings—in the limited‑edition 911 S/T. From Q3 2024, valve springs were upgraded to a resonance‑damped variant, creating minor production splits. All adaptations are documented in OEM technical bulletins.
Engine code 'MDG.GA' is laser-etched on the rear crankcase near the flywheel housing (Porsche TIS P992-ID-14). 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-Q3-2024 engines use standard valve springs (Porsche part #992.105.200.00); post-update units feature resonance-damped springs (part #992.105.200.10). No other Porsche models use this engine code.
The MDG.GA's primary reliability consideration is valve spring harmonic resonance under sustained high‑rpm operation, with internal Porsche durability testing (2024) indicating minor instability in 5% of pre‑Q3‑2024 engines during 30+ minute track sessions above 8,000 rpm. No valve float or mechanical failure was observed, but the condition may accelerate wear. The revised spring design eliminates this risk entirely.
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 MDG-GA.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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