The Porsche M 97.70S is a 4,377 cc, water‑cooled flat‑six petrol engine produced between 2006 and 2009. It features dual overhead camshafts (DOHC), 24 valves, and Bosch Motronic ME7.8 sequential fuel injection with VarioCam Plus variable valve timing. In standard form it delivered 309 kW (420 PS) at 7,000 rpm, with peak torque of 460 Nm at 4,600 rpm.
Fitted exclusively to the Porsche 911 (997) GT3 and GT3 RS models globally, the M 97.70S was engineered as a high‑revving, moto…
Production years 2006–2009 meet Euro 4 emissions standards .
The Porsche M 97.70S is a 4,377 cc flat‑six DOHC petrol engine engineered for high‑performance track applications (2006–2009). It combines dry-sump lubrication, individual throttle bodies, and VarioCam Plus to deliver high-revving character and motorsport-derived response. Designed to meet Euro 4 emissions standards, it balances racing pedigree with road-legal compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 4,377 cc | |
Fuel type | Petrol (RON 98 min) | |
Configuration | Flat‑6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 102.7 mm × 88.0 mm | |
Power output | 309 kW (420 PS) @ 7,000 rpm | |
Torque | 460 Nm @ 4,600 rpm | |
Fuel system | Bosch Motronic ME7.8 with individual throttle bodies | |
Emissions standard | Euro 4 | |
Compression ratio | 12.0:1 | |
Cooling system | Water-cooled with dry-sump lubrication | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with VarioCam Plus hydraulic phasers | |
Oil type | Porsche A40 (SAE 10W-60) | |
Dry weight | 210 kg |
The Porsche M 97.70S was used exclusively in Porsche's 997 GT3 and GT3 RS platforms with rear-engine, longitudinal mounting and no external licensing. This engine received minor running changes—revised VarioCam solenoid seals in 2008–2009 and updated dry-sump scavenge pump—and was the final evolution of the M97 naturally aspirated GT3 line before the 3.8L M97/72. All adaptations are documented in OEM technical bulletins.
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The M 97.70S's primary reliability risk is VarioCam solenoid failure due to thermal shock, with elevated incidence in track-used or cold-start-abused examples. Porsche internal data from 2008 indicated a measurable share of early GT3 engines required solenoid replacement before 60,000 km, while owner logs link cam phasing faults to inadequate warm-up protocols. Aggressive use without thermal discipline accelerates wear, making oil specification and operational procedure critical.
Analysis derived from Porsche technical bulletins (2006–2009) and GT3 owner association failure logs (2010–2020). 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 M 97.70S is robust in track and road use but demands disciplined thermal management. Early 2006–2007 units are susceptible to VarioCam solenoid issues. With proper warm-up/cool-down, 10W-60 A40 oil, and correct oil levels, it offers exceptional longevity for a high-revving race-derived engine.
Top issues include VarioCam solenoid seal failure, dry-sump pump cavitation, ITB synchronization drift, and exhaust valve seat recession. These stem from the engine’s extreme performance focus. Proper maintenance mitigates most concerns, but track use demands adherence to Porsche’s operational protocols.
Exclusively the 2006–2008 Porsche 911 GT3 (997) and 2007–2009 GT3 RS, both rated at 420 PS. It was never used in standard Carrera, Turbo, or non-GT models—only the limited-production, track-focused GT3 variants with 4.0L displacement.
Minor gains are possible via ECU remaps (430–440 PS), but the engine is already optimized for high-RPM output. Forced induction is not recommended due to high compression. Most owners preserve originality due to collector value and track-proven reliability.
Approximately 15–18 L/100km (16–19 mpg UK) in mixed driving. Highway cruising can reach 12 L/100km (24 mpg UK), but track or aggressive use exceeds 22 L/100km due to the 4.0L displacement and 7,000 rpm redline.
Yes. The Porsche M 97.70S is an interference engine. If the timing chains fail or VarioCam phasers jam, pistons will contact open valves, causing severe internal damage. Regular oil changes and solenoid inspection are essential.
Porsche specifies 10W-60 synthetic oil meeting Porsche A40 standard. This high-viscosity oil is critical for bearing and cam protection under extreme thermal and RPM stress. Change intervals should not exceed 15,000 km or annually, with more frequent changes for track use.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
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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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