The Porsche MCT.BB is a 2,994 cc, twin‑turbocharged V6 petrol engine introduced in 2022 for mid‑range performance applications. It features direct fuel injection, variable valve timing (VarioCam Plus), and hot‑vee turbo layout with electric wastegates. In standard form it delivers 260 kW (354 PS) with torque of 500 Nm, engineered for responsive urban and highway driving.
Fitted to the Cayenne E-Hybrid (9YA) and Panamera 4 E-Hybrid (971.2), the MCT.BB was engineered for hybrid synergy, balancing electric boost with refined combustion output for low emissions and sporty character. Emissions compliance is achieved via gasoline particulate filters (GPF), cooled exhaust gas recirculation (EGR), and precise lambda control, meeting Euro 6d standards across all markets.
One documented engineering update relates to early‑production high‑pressure fuel pump calibration, addressed in Porsche Technical Service Bulletin 971‑05‑23. Affects Cayenne E-Hybrid units built before March 2023, causing intermittent lean codes under sustained load. Porsche issued revised fuel rail pressure mapping and injector dwell calibration to resolve combustion instability.
All production years (2022–present) meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/6789).
The Porsche MCT.BB is a 2,994 cc V6 twin‑turbo petrol engine engineered for hybrid applications in SUVs and sedans (2022–present). It combines a hot‑vee turbo architecture with VarioCam Plus and hybrid integration to deliver smooth, immediate torque. Designed to meet Euro 6d emissions, it balances efficiency with Porsche’s dynamic driving signature.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,994 cc | |
| Fuel type | Petrol (RON 98 min) | |
| Configuration | V6, DOHC, 24‑valve | |
| Aspiration | Twin‑turbocharged (hot‑vee) | |
| Bore × stroke | 86.0 mm × 85.8 mm | |
| Power output | 260 kW (354 PS) @ 6,400 rpm | |
| Torque | 500 Nm @ 1,600–4,500 rpm | |
| Fuel system | Direct injection (up to 350 bar) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.5:1 | |
| Cooling system | Dual‑circuit water‑cooled | |
| 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 | 182 kg |
The hot-vee turbo layout minimizes lag and enhances packaging in hybrid platforms but demands high-quality oil for turbo bearing and chain longevity. Porsche C4 (0W‑40) is mandatory to protect high-pressure fuel system components and timing chain under thermal stress. Extended hybrid-only operation can lead to GPF under-temperature; occasional combustion-mode driving above 2,500 rpm is advised. Early builds (pre-03/2023) require ECU update per SIB 971‑05‑23 to resolve lean misfire under load.
Oil Specs: Requires Porsche C4 (0W‑40) specification (Porsche SIB 971‑04‑23). Equivalent to ACEA C3 with Porsche-specific HTHS and SAPS limits.
Emissions: Euro 6d certification applies universally (VCA Type Approval #VCA/EMS/6789), including RDE compliance.
Power Ratings: Measured under ISO 1585 standards. Full 354 PS output requires RON 98 fuel and ambient temperatures below 35°C (Porsche TIS Doc. 971‑P02).
Porsche Technical Information System (TIS): Docs 971‑E30, 971‑T05, 971‑F09, SIB 971‑04‑23, SIB 971‑05‑23
VCA Type Approval Database (VCA/EMS/6789)
ISO 1585: Road vehicles — Engine test code
The Porsche MCT.BB is used exclusively in Porsche's 971.2 and 9YA hybrid platforms with longitudinal front‑mounting. This engine integrates with 100 kW electric motors and requires platform-specific engine mounts, cooling circuits, and hybrid control modules—creating strict interchange limits. No licensing partnerships exist. All adaptations are documented in OEM technical bulletins.
Engine code MCT.BB is laser-etched on the front right cylinder bank near the timing cover (Porsche TIS 971‑E30). VIN 7th digit is 'E' for E-Hybrid variants; 10th digit '3' denotes 2023 model year. Early units (build date <03/2023) use silver fuel rail pressure sensors; updated units feature black sensors with revised calibration. Do not interchange high-pressure fuel pumps or ECUs between pre- and post-March 2023 builds—calibration differences cause combustion instability per Porsche SIB 971‑05‑23.
The MCT.BB's primary reliability concern is early-production high-pressure fuel system calibration sensitivity, with elevated incidence in sustained-load highway driving. Porsche internal data from Q1 2024 indicated a subset of pre-March 2023 Cayenne E-Hybrid units exhibited lean misfire under aggressive acceleration, while no structural failures have been reported. Hybrid operation profiles and strict oil compliance make fluid quality and driving patterns critical.
Analysis derived from Porsche technical bulletins (2022–2025) and UK DVSA failure statistics (2023–2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE MCT-BB.
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