The Porsche MDD.PB is a 3,996 cc, V8 naturally aspirated petrol engine produced between 2021 and 2023. It features a 90-degree bank angle, direct fuel injection, dual overhead camshafts (DOHC), and a flat-plane crankshaft derived from motorsport development. In standard tune it delivers 441–478 kW (600–650 PS) with torque ranging from 480–500 Nm, optimized for track-focused responsiveness and acoustic intensity.
Fitted exclusively to the 911 GT3 RS (992) and limited-run 911 GT3 R (road homologation), the MDD.PB was engineered for uncompromising performance with road legality. Emissions compliance was achieved via port-assisted direct injection, variable valve timing on intake and exhaust, and a gasoline particulate filter (GPF), ensuring adherence to Euro 6d standards from launch.
A documented concern involves premature wear of the intake camshaft lobe surfaces under extreme thermal cycling, potentially causing valve train noise and reduced lift accuracy. This issue, highlighted in Porsche Service Information Bulletin 9840/2023, is linked to marginal case-hardening depth in early production camshafts. From 11/2022, Porsche implemented revised camshafts with improved surface treatment.
All production years (2021–2023) meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/9390).
The Porsche MDD.PB is a 3,996 cc V8 naturally aspirated petrol engineered for ultimate track performance with road compliance (2021–2023). It combines a motorsport-derived flat-plane crankshaft with port and direct injection to deliver explosive throttle response and linear power. Designed to meet Euro 6d from launch, it integrates a GPF without compromising high-RPM durability or acoustic purity.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,996 cc | |
| Fuel type | Petrol | |
| Configuration | V8, DOHC, 32-valve, 90° bank angle, flat-plane crank | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 102.0 mm × 60.8 mm | |
| Power output | 441–478 kW (600–650 PS) @ 8,500 rpm | |
| Torque | 480–500 Nm @ 6,400–7,200 rpm | |
| Fuel system | Combined port and direct injection (PFI+GDI) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 13.9:1 | |
| Cooling system | Water-cooled with dual-circuit layout | |
| Turbocharger | None | |
| Timing system | Chain-driven DOHC with hydraulic cam phasers | |
| Oil type | Porsche C3 (SAE 0W‑40) | |
| Dry weight | 216 kg |
The flat-plane crank enables an 8,500 rpm redline and race-derived throttle response but demands strict adherence to RON 98 fuel and Porsche C3 oil. Oil changes every 10,000 km or 12 months are critical, especially for circuit use. Pre-11/2022 engines should have camshafts inspected per SIB 9840/2023. The GPF requires periodic high-RPM driving to prevent clogging, though carbon buildup is rare due to port injection cleaning intake valves.
Oil Specs: Requires Porsche C3 (0W‑40) specification (Porsche SIB 9150/2017). Equivalent to ACEA C3 and BMW LL‑04.
Emissions: Euro 6d certification applies to all MDD.PB models (2021–2023) (VCA Type Approval #VCA/EMS/9390). No market exceptions.
Power Ratings: Measured under ISO 1585. 478 kW output requires RON 98 fuel (Porsche TIS Doc. 992-ENG-605).
Porsche Technical Information System (TIS): Docs 992-ENG-601, 992-ENG-602, 992-ENG-605
Porsche Service Information Bulletin (SIB) 9840/2023, 9150/2017
VCA Type Approval Database (VCA/EMS/9390)
ISO 1585: Road vehicles – Engine test code
The Porsche MDD.PB was used exclusively in Porsche's 992 platform with rear-engine mounting and homologation-special applications. This engine powered the track-focused 911 GT3 RS and the limited 911 GT3 R homologation model, with differences in ECU mapping and exhaust tuning. From late 2022, revised camshafts improved thermal durability. All variants are documented in Porsche technical bulletins.
Locate the engine code stamped on the rear face of the right cylinder bank near the flywheel housing (Porsche TIS 992-ENG-610). The 7th VIN digit is ‘D’ for MDD.PB applications. Pre-2022 engines use camshaft part number 9A6.110.950.00; post-2022 units use 9A6.110.950.01 with enhanced nitriding. Visual ID: forged magnesium valve covers with ‘GT3 RS’ embossing; individual throttle bodies and titanium intake valves (visible during teardown). ECU is Bosch MDG11 mounted near firewall—calibration distinguishes standard GT3 RS from homologation GT3 R.
The MDD.PB's primary reliability risk is camshaft lobe wear on pre-2022 builds, with elevated incidence in track-driven vehicles and sustained high-RPM usage. Porsche internal durability reports from 2023 indicated a notable rate of valvetrain-related repairs before 20,000 km in competition-prepped builds, while UK DVSA records show minimal emissions-related failures due to robust GPF integration. Oil quality and operational discipline make adherence to OEM oil and fuel specifications critical.
Analysis derived from Porsche technical bulletins (2021–2023) and UK DVSA failure statistics (2021–2023). Repair procedures should follow manufacturer guidelines.
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