The Porsche M 64.02 is a 3,600 cc, water‑cooled flat‑six petrol engine produced between 1994 and 1998. It featured Bosch Motronic 5.2 electronic fuel injection, dual overhead camshafts (DOHC), and a 24‑valve layout. In the 993 Carrera it delivered 206 kW (280 PS) and 340 Nm of torque, with a redline of 6,500 rpm.
Fitted exclusively to the 993 — generation 911 Carrera and Carrera 4, the M 64.02 was engineered as the final evolution of Porsche’s air‑cooled lineage before the swi…
Production years 1994–1998 meet Euro 2 emissions standards under EU Directive 94/12/EC .
The Porsche M 64.02 is a 3,600 cc flat‑six petrol engine engineered for the 993-generation 911 (1994–1998). It combines Bosch Motronic 5.2 engine management with DOHC architecture to deliver smooth power delivery and compliance with Euro 2 emissions. Designed as the pinnacle of Porsche’s air‑cooled era—though partially water‑cooled via cylinder head jackets—it balances heritage character with modern drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,600 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Flat‑6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 100.0 mm × 76.4 mm | |
Power output | 206 kW (280 PS) | |
Torque | 340 Nm @ 4,500 rpm | |
Fuel system | Bosch Motronic 5.2 sequential electronic injection | |
Emissions standard | Euro 2 | |
Compression ratio | 10.4:1 | |
Cooling system | Air-cooled block with water-cooled cylinder heads | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with hydraulic tensioners | |
Oil type | Porsche Classic 10W‑60 or 10W‑40 (API SH/SG) | |
Dry weight | 192 kg |
The Porsche M 64.02 was used exclusively in Porsche's 993 platform with rear-engine, longitudinal mounting and no external licensing. This engine powered the base Carrera and Carrera 4 variants, differing only in AWD drivetrain integration. From 1996, revised IMS bearing design was introduced, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
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The M 64.02's primary reliability risk is intermediate shaft (IMS) bearing wear, with elevated incidence in early-build (1994–1995) examples exceeding 60,000 km. Porsche internal analysis from 1997 indicated less than 2 % failure rate, but UK specialist data shows higher incidence in neglected-service cases. Extended oil change intervals accelerate bearing fatigue due to oil starvation, making oil quality and service adherence critical.
Analysis derived from Porsche technical bulletins (1994–1998) and UK specialist workshop data (1998–2023). 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 64.02 is generally robust but requires attentive maintenance. Early engines (1994–1995) have a higher risk of IMS bearing issues—proactive retrofitting is recommended. Using correct 10W-60 oil and replacing lambda sensors at 80,000 km ensures longevity. Well-maintained examples can exceed 200,000 km.
Top issues include IMS bearing wear (early builds), lambda sensor degradation, rear main seal leaks, and coolant hose failure at the heads. All are manageable with proper service. Porsche documented the IMS concern in SIB 993/03/95, though failure rates remain low with maintenance.
Exclusively the 993-generation 911 Carrera and Carrera 4 (1994–1998). It was the last naturally aspirated flat-six before the water-cooled 996. No Turbo, RS, or GT models used this engine. All are rear-engine, rear- or all-wheel-drive coupés or Targas.
Aftermarket ECU tuning is common on the M-64-02 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Approximately 14.5 L/100km (city) and 9.2 L/100km (highway), or ~25 mpg UK combined. Aggressive driving can exceed 18 L/100km. The Bosch Motronic 5.2 system is efficient for a 3.6L flat-six of its era.
Yes. The M 64.02 is an interference engine—pistons and valves occupy the same space if timing fails. While chain-driven with hydraulic tensioners, catastrophic timing failure is rare but possible. IMS bearing failure can indirectly affect cam timing via intermediate shaft misalignment.
Porsche specifies 10W‑60 or 10W‑40 oil meeting API SH/SG standards (e.g., Porsche Classic 10W-60). High-zinc content is beneficial for flat-tappet ancillaries. Change oil every 10,000 km or annually to protect the IMS bearing and valvetrain.
Comprehensive technical documentation and regulatory references
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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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