The Porsche MCW.BA is a 3,996 cc, naturally aspirated flat‑six petrol engine introduced in 2020 for the 911 GT3 (992.1). It features direct fuel injection, variable valve timing (VarioCam Plus), and a high — revving valvetrain with solid lifters. In standard form it delivers 375 kW (510 PS) at 8,400 rpm with torque of 470 Nm, engineered for motorsport‑derived responsiveness and linear power delivery.
Fitted exclusively to the 992.1‑generation 911 GT3, the MCW.BA is the r…
All production years (2020–present) meet Euro 6d standards .
The Porsche MCW.BA is a 3,996 cc flat‑six naturally aspirated petrol engine engineered for high‑performance 911 GT3 applications (2020–present). It combines individual throttle bodies with dry‑sump lubrication and solid lifters to deliver motorsport‑level throttle response and high‑rpm stability. Designed to meet Euro 6d emissions, it balances track capability with road legality and daily usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,996 cc | |
Fuel type | Petrol (RON 98 min) | |
Configuration | Flat‑6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 102.0 mm × 81.5 mm | |
Power output | 375 kW (510 PS) @ 8,400 rpm | |
Torque | 470 Nm @ 6,100 rpm | |
Fuel system | Direct injection with port assist (up to 200 bar) | |
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 solid lifters | |
Oil type | Porsche C4 (SAE 0W‑40) | |
Dry weight | 210 kg |
The Porsche MCW.BA is used exclusively in Porsche's 992.1 GT3 platform with longitudinal rear‑mounting. This engine features motorsport-derived dry‑sump lubrication, individual throttle bodies, and solid lifters—and from mid‑2021, revised valve springs—creating strict interchange limits. No licensing partnerships exist. All adaptations are documented in OEM technical bulletins.
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The MCW.BA's primary reliability concern is early-production valve spring durability under sustained high‑rpm operation. Porsche internal data from Q3 2021 indicated a subset of pre‑May 2021 GT3 units exhibited valve float above 8,200 rpm, while no bottom‑end failures have been reported. High thermal and mechanical loads make oil quality and valvetrain inspection critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The MCW.BA is engineered for track durability with motorsport-derived internals. Early units (pre-May 2021) had minor valve spring issues, now resolved. With proper oil changes, RON 98 fuel, and periodic high-rpm operation, long-term reliability is excellent for a high-revving NA engine.
Main issues are valve spring fatigue (early builds), GPF clogging from urban use, oil pressure relief valve sticking, and throttle body synchronization drift. All are documented in Porsche SIBs 992‑06‑21 and 992‑07‑21, with official fixes available.
Exclusively the 992.1-generation 911 GT3 (2020–present). No other Porsche or partner vehicles use this naturally aspirated flat-six.
Limited tuning potential due to already optimized NA configuration. ECU remaps yield minimal gains (<10 PS) but can improve throttle response. Aggressive cam upgrades require valvetrain reinforcement. Porsche Motorsport offers official track-only kits with revised cams and exhaust.
Official combined: 12.5 L/100km (~23 mpg UK). Real-world mixed use typically yields 14–17 L/100km (20–17 mpg UK). Track days can exceed 22 L/100km. Requires RON 98 minimum for full performance and engine protection.
Yes. Like all modern Porsche flat-six engines, the MCW.BA is an interference design. Timing failure would cause catastrophic valve-piston contact. However, it uses a maintenance-free chain with solid lifters—failures are extremely rare when oil and valve clearance are maintained.
Porsche C4 specification (SAE 0W‑40) synthetic oil. Must meet Porsche’s HTHS and low-SAPS requirements. Change every 10,000 km or 12 months, or before/after track events. Never use non-C4 oils.
Comprehensive technical documentation and regulatory references
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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