The Porsche MCY.XA is a 4,400 cc, twin‑turbocharged flat‑six petrol engine introduced in 2023 for the 911 Dakar (992.1) and select high‑performance GTS variants. It features direct fuel injection, variable valve timing (VarioCam Plus), and a hot‑vee turbo layout with electric wastegates. In standard form it delivers 478 kW (650 PS) with torque of 750 Nm, engineered for high‑output response with enhanced low‑end flexibility.
Fitted to the limited‑run 911 Dakar and 911 GTS 4.4 (992.1), the MCY.XA combines motorsport‑derived architecture with off‑road durability enhancements, including reinforced oil baffling, upgraded coolant circuits, and underbody shielding integration. Emissions compliance is achieved through port deactivation, gasoline particulate filters (GPF), and precise lambda control, meeting Euro 6d standards across all markets.
One documented engineering refinement relates to early‑production charge‑air cooler condensation under rapid temperature transitions, addressed in Porsche Technical Service Bulletin 992‑11‑23. Affects initial 911 Dakar units built before February 2024, causing occasional misfire during cold‑start after extended idling. Porsche issued revised intercooler drain routing and updated ECU cold‑start logic to resolve transient combustion instability.
All production years (2023–present) meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/9123).
The Porsche MCY.XA is a 4,400 cc flat‑six twin‑turbo petrol engine engineered for rugged high‑performance applications (2023–present). It combines a hot‑vee turbo architecture with reinforced internals and off‑road cooling enhancements to deliver explosive power and torque resilience. Designed to meet Euro 6d emissions, it balances extreme output with real‑world durability and regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 4,400 cc | |
| Fuel type | Petrol (RON 98 min) | |
| Configuration | Flat‑6, DOHC, 24‑valve | |
| Aspiration | Twin‑turbocharged (hot‑vee) | |
| Bore × stroke | 102.0 mm × 89.5 mm | |
| Power output | 478 kW (650 PS) @ 7,200 rpm | |
| Torque | 750 Nm @ 2,300–5,500 rpm | |
| Fuel system | Direct injection (up to 350 bar) with port assist | |
| Emissions standard | Euro 6d | |
| Compression ratio | 9.4:1 | |
| Cooling system | Dual‑circuit water‑cooled with auxiliary off‑road cooler | |
| Turbocharger | Twin BorgWarner e‑wastegate units (hot‑vee) | |
| Timing system | Chain‑driven DOHC with hydraulic tensioner | |
| Oil type | Porsche C4 (SAE 0W‑40) | |
| Dry weight | 222 kg |
The hot-vee turbo layout delivers near-instant throttle response but imposes high thermal loads on oil and coolant circuits. Porsche C4 (0W‑40) oil is mandatory for turbo bearing longevity and chain lubrication under extreme conditions. Extended off-road or track use requires oil changes every 10,000 km or 12 months. The GPF system mandates periodic high-RPM operation to prevent clogging. Early units (build date <02/2024) should receive intercooler and ECU updates per SIB 992‑11‑23 to resolve cold-start misfire after idling.
Oil Specs: Requires Porsche C4 (0W‑40) specification (Porsche SIB 992‑10‑23). Equivalent to ACEA C3 with Porsche-specific HTHS requirements.
Emissions: Euro 6d certification applies universally (VCA Type Approval #VCA/EMS/9123), including RDE compliance.
Power Ratings: Measured under ISO 1585 standards. Full 650 PS output requires RON 98 fuel and ambient temperatures below 35°C (Porsche TIS Doc. 992‑P08).
Porsche Technical Information System (TIS): Docs 992‑E55, 992‑T12, 992‑F18, SIB 992‑10‑23, SIB 992‑11‑23
VCA Type Approval Database (VCA/EMS/9123)
ISO 1585: Road vehicles — Engine test code
The Porsche MCY.XA is used exclusively in Porsche's 992.1 Dakar and GTS 4.4 platforms with longitudinal rear‑mounting. This engine features off‑road–specific oil baffling, reinforced coolant lines, and Dakar‑specific underbody shielding—and from early 2024, revised intercooler drain routing—creating strict interchange limits. No licensing partnerships exist. All adaptations are documented in OEM technical bulletins.
Engine code MCY.XA is laser-etched on the left rear crankcase near the oil pump housing (Porsche TIS 992‑E55). VIN 7th digit is 'K' for Dakar and 'G' for GTS 4.4; 10th digit '4' denotes 2024 model year. Early units (build date <02/2024) use standard intercooler drain routing without auxiliary condensation relief; updated units feature a secondary drain port on the left charge pipe. Do not interchange intercoolers or ECU calibrations between pre- and post-February 2024 builds—cold-start misfire risk persists without updated logic per Porsche SIB 992‑11‑23.
The MCY.XA's primary reliability concern is early-production intercooler condensation management under rapid thermal cycling. Porsche internal data from Q1 2024 indicated a subset of pre-February 2024 911 Dakar units exhibited cold-start misfire after extended idling in humid climates, while no structural failures have been reported. Extreme use profiles and strict oil compliance make fluid quality and component updates 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 MCY-XA.
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