The Porsche M97.20 is a 3,387 cc, water — cooled flat‑six petrol engine produced between 2005 and 2008. It features a horizontally opposed layout, dual overhead camshafts (DOHC), and Bosch Motronic ME7.8 digital fuel injection. Output was rated at 239 kW (325 PS) @ 6,800 rpm and 370 Nm of torque, engineered for high — revving responsiveness in the 997 — generation 911 Carrera.
Fitted exclusively to the Porsche 911 Carrera (997) and Cayman S (987) models, the M97.20 represent…
Production years 2005–2008 meet EU Directive 94/12/EC (Euro 4) standards depending on market (VCA Type Approval #VCA/EMS/7418).
The Porsche M97.20 is a 3,387 cc flat-six DOHC petrol engine engineered for rear- and mid-engine sports applications (2005–2008). It combines Bosch Motronic ME7.8 digital injection with a gear-driven valvetrain to deliver smooth high-RPM power and refined chassis balance. Designed to meet Euro 4 emissions thresholds, it builds upon the M96 foundation with enhanced displacement and improved oil circulation.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,387 cc | |
Fuel type | Petrol (RON 95 minimum, RON 98 recommended) | |
Configuration | Flat‑6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 99.0 mm × 78.0 mm | |
Power output | 239 kW (325 PS) @ 6,800 rpm | |
Torque | 370 Nm @ 4,250 rpm | |
Fuel system | Bosch Motronic ME7.8 digital electronic injection | |
Emissions standard | EU Directive 94/12/EC (Euro 4) | |
Compression ratio | 11.3:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Gear-driven intermediate shafts (no timing belt/chain) | |
Oil type | SAE 10W-60 synthetic (Porsche A40 spec) | |
Dry weight | 188 kg |
The Porsche M97.20 was used in the Porsche 997 and 987 platforms with rear- and mid-engine, longitudinal mounting and no external licensing. This engine powered the 997 Carrera (2005–2008) and Cayman S (2006–2008), featuring increased displacement over the M96 and revised oil pickup geometry. From 2009, the direct-injection MA1 engine family replaced the M97 series. All adaptations are documented in OEM technical bulletins.
The M97.20's primary reliability risk is intermediate shaft (IMS) bearing wear, with elevated incidence in vehicles subjected to short-trip driving or extended storage. Porsche internal service data (2009) indicated IMS-related concerns in over 6% of early-build 997 engines before 100,000 km, while DVSA MOT records cite frequent catalytic converter and oil leak failures in UK examples due to thermal cycling and seal degradation.
Analysis derived from Porsche technical bulletins (2005–2008) and UK DVSA historic MOT failure statistics (2010–2022). 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 M97.20 is generally more robust than its M96 predecessor but still carries IMS bearing risk—especially in low-mileage or garage-kept examples. With disciplined maintenance (15,000 km oil changes using 10W-60 A40 oil) and proactive IMS monitoring, it can reliably exceed 200,000 km. Post-2006 revisions improved oiling, enhancing durability.
Top issues include IMS bearing wear, rear main seal leaks, VarioCam solenoid clogging from oil sludge, and catalytic converter failure due to oil ingestion. All are documented in Porsche TSBs. Regular oil changes and short-trip avoidance are key to longevity.
The M97.20 powered the 2005–2008 Porsche 911 Carrera (997) and 2006–2008 Cayman S (987). It was never used in Turbo, GT3, or Boxster base models. The 2009+ 997.2 and 987.2 adopted direct-injection MA1 engines, ending M97 production.
Yes. Stage 1 ECU remaps yield ~350–360 PS reliably. The 11.3:1 compression supports mild forced induction with forged internals, but naturally aspirated builds benefit most from headers, cams, and intake. Always retain catalytic compliance where legally required.
Approximately 11–13 L/100km (21–26 mpg UK) in mixed driving. The high-compression flat-six prioritizes performance over efficiency. Highway cruising yields ~9.5 L/100km, but spirited driving can exceed 16 L/100km.
No. The M97.20 is a non-interference engine—valve-to-piston contact is highly unlikely even if cam timing is compromised, due to generous combustion chamber clearance.
Porsche specifies 10W-60 synthetic meeting A40 (or ACEA A3/B4). Change every 15,000 km or annually. High-temperature film strength is essential for IMS, cam, and bearing protection under sustained loads.
Comprehensive technical documentation and regulatory references
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