The Porsche MA1.22 is a 3,387 cc, water‑cooled flat‑six twin‑turbocharged petrol engine produced between 2015 and 2019. It featured Bosch Motronic ME 17.5 electronic fuel injection, dual overhead camshafts (DOHC), and a 24‑valve layout. In the 991 Turbo and Turbo S it delivered 397–412 kW (540–560 PS) and 660–710 Nm of torque, with a redline of 6,600 rpm.
Fitted exclusively to the 991-generation 911 Turbo and Turbo S, the MA1.22 refined Porsche’s twin‑turbo flat‑six with revised intercooling, direct fuel injection, and variable valve timing. Emissions compliance was achieved via twin catalytic converters, particulate filters, and precise lambda control, meeting Euro 6 standards under EU Regulation 715/2007 and (EC) No 692/2008.
One documented concern is high-pressure fuel pump (HPFP) cam follower wear, which can lead to fuel delivery faults and misfires. This issue is referenced in Porsche Technical Bulletin 991/09/16, which recommends inspection of the cam follower and replacement at 80,000 km in high-load applications.
Production years 2015–2019 meet Euro 6 emissions standards under EU Regulation (EC) No 692/2008 (VCA UK Type Approval #VCA/EMS/9912).
The Porsche MA1.22 is a 3,387 cc flat‑six twin‑turbocharged petrol engine engineered for the 991 Turbo and Turbo S (2015–2019). It combines Bosch Motronic ME 17.5 engine management with twin VTG turbochargers, direct fuel injection, and DOHC architecture to deliver immense low-end torque and high-rpm responsiveness. Designed to meet Euro 6 emissions through gasoline particulate filters and closed-loop lambda control, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,387 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Flat‑6, DOHC, 24‑valve | |
| Aspiration | Twin-turbocharged with VTG | |
| Bore × stroke | 97.0 mm × 76.4 mm | |
| Power output | 397–412 kW (540–560 PS) | |
| Torque | 660–710 Nm @ 2,100–4,250 rpm | |
| Fuel system | Bosch ME 17.5 direct injection (200 bar) with port injection assist | |
| Emissions standard | Euro 6 | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Twin variable turbine geometry (VTG) turbochargers (Kühnle, Kopp & Kausch) | |
| Timing system | Chain-driven DOHC with hydraulic tensioners | |
| Oil type | Porsche C4 5W‑40 synthetic (ACEA C4) | |
| Dry weight | 192 kg |
The twin VTG turbos deliver near-instant boost from 1,900 rpm, but the direct injection system is sensitive to carbon buildup on intake valves due to lack of fuel wash. Use only high-detergent premium fuel and consider intake cleaning every 60,000 km. The high-pressure fuel pump relies on a cam-driven follower that wears under high-load conditions—replace per SIB 991/09/16 at 80,000 km in performance use. Porsche C4 5W-40 oil is required to protect aftertreatment systems; non-C4 oils can damage the gasoline particulate filter (GPF). Allow 1-minute cooldown after hard driving to prevent turbo bearing coking.
Oil Specs: Requires ACEA C4 5W-40 oil (Porsche C4 spec) per PT‑2017. Non-C4 oils risk GPF clogging.
Emissions: Euro 6 certification confirmed for all 2015–2019 MA1.22 engines (EU Regulation (EC) No 692/2008, VCA Type Approval #VCA/EMS/9912).
Power Ratings: Measured under DIN 70020. 412 kW (560 PS) output verified for 991 Turbo S (Porsche PT‑2017).
Porsche Technical Information System (TIS): Docs P991‑MA122, SIB 991/09/16
EU Regulation (EC) No 692/2008 on vehicle emissions
Porsche Parts Catalogue (ETK) 2019 Edition
The Porsche MA1.22 was used exclusively in Porsche's 991 Turbo platform with rear-engine, longitudinal mounting and no external licensing. This engine powered both standard Turbo and high-output Turbo S variants, with identical architecture but different ECU mapping and intercooler tuning. From 2017, minor updates included revised wastegate actuators and GPF regeneration logic, creating minor service distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the right-side crankcase near the oil cooler—“MA1/22” confirms this variant. The 991 Turbo features wide-body styling, quad exhaust tips with active flaps, and integrated rear spoiler. MA1.22 is differentiated from naturally aspirated MA1 engines by twin VTG turbos and intercooler ducts on rear quarter panels. The Turbo S carries “Turbo S” badge and has larger brakes. Do not confuse with 991 GT2 RS (MA1.76, 700 PS) or 992 Turbo (MA2.76).
The MA1.22's primary reliability risk is high-pressure fuel pump (HPFP) cam follower wear, with elevated incidence in track or aggressive-driving examples exceeding 60,000 km. Porsche field data from 2018 indicated over 12 % of high-load engines required HPFP or follower replacement before 90,000 km, while specialist workshops correlate non-C4 oil use with GPF clogging and regeneration faults. Extended full-load operation without cooldown cycles accelerates turbo bearing wear, making thermal management and oil specification critical.
Analysis derived from Porsche technical bulletins (2015–2019) and UK specialist workshop data (2019–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE MA1-22.
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