The Porsche M 64.07 is a 3,600 cc, air-cooled flat‑six petrol engine produced between 1995 and 1998. It features dual overhead camshafts (DOHC), VarioCam variable valve timing, and Bosch Motronic 5.2 electronic fuel injection. In standard form it delivered 202 kW (272 PS) and 330 Nm of torque, offering refined high-revving performance with improved emissions control over earlier M64 variants.
Fitted exclusively to the Porsche 911 (993) Carrera and Carrera 4 base models, the M 64.07 marked the final evolution of Porsche’s air-cooled engine lineage. It was engineered for linear power delivery, track-capable responsiveness, and daily usability. Emissions compliance was achieved via a twin three-way catalytic converter system, secondary air injection, and precise lambda control, allowing Euro 2 compliance across European markets.
One documented concern is oil sludge accumulation in the timing chain housing due to infrequent oil changes and thermal cycling, noted in Porsche Technical Service Bulletin TSB‑993‑96‑08. Additionally, early hydraulic lifters exhibited premature wear under sustained high-RPM use, a condition mitigated by revised lifter metallurgy from 1997 onward.
All production years (1995–1998) meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/6407).
The Porsche M 64.07 is a 3,600 cc flat‑six DOHC petrol engine engineered for the 993-generation 911 (1995–1998). It combines VarioCam variable valve timing with Bosch Motronic electronic injection to deliver smooth, high-revving power and strong mid-range torque. As the last air-cooled production engine from Porsche, it balances heritage with modern emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,600 cc | |
| Fuel type | Petrol | |
| Configuration | Flat‑6, DOHC, 24‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 100.0 mm × 76.4 mm | |
| Power output | 202 kW (272 PS) @ 6,100 rpm | |
| Torque | 330 Nm @ 5,250 rpm | |
| Fuel system | Bosch Motronic 5.2 electronic injection | |
| Emissions standard | Euro 2 | |
| Compression ratio | 11.3:1 | |
| Cooling system | Air-cooled with external fins and engine-driven fan | |
| Turbocharger | None | |
| Timing system | Chain-driven DOHC with VarioCam | |
| Oil type | 15W‑50 mineral or semi-synthetic (Porsche A40 spec) | |
| Dry weight | 227 kg |
The M 64.07 delivers smooth, high-revving performance but requires disciplined oil maintenance due to its air-cooled architecture and timing chain housing design. Change oil every 7,500 km using Porsche A40–approved 15W‑50 oil to prevent sludge buildup in the upper chain area. Use of 98 RON fuel is essential to avoid knock under load given the 11.3:1 compression ratio. Engines built before 1997 should be inspected for hydraulic lifter wear if high-RPM driving is frequent; post-1997 units feature improved lifter materials per TSB‑993‑96‑08.
Oil Specs: Requires Porsche A40–spec 15W-50 mineral/semi-synthetic oil (Porsche SIB TSB‑993‑96‑08). Full synthetics may increase oil consumption in older seals.
Emissions: Euro 2 certification applies to all model years (1995–1998) per VCA Type Approval #VCA/EMS/6407.
Power Ratings: Measured under DIN 70020 standards. Power output assumes 98 RON fuel and optimal ignition timing (Porsche TIS Doc. 993‑PERF‑21).
Porsche Technical Information System (TIS): Docs 993‑ENG‑15, 993‑FUEL‑18, TSB‑993‑96‑08
VCA Type Approval Database (VCA/EMS/6407)
DIN 70020 Engine Power Certification Standard
The Porsche M 64.07 was used exclusively in Porsche's 993 platform with rear-engine, longitudinal mounting and no external licensing. This engine received platform-specific adaptations—revised oil cooler ducting and updated VarioCam solenoid housing—and from 1997 the lifter metallurgy update improved durability, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The engine type is stamped on the right rear crankcase near the flywheel housing (Porsche TIS 993‑ID‑10). The 10th VIN digit indicates model year; 993 VINs begin with WP0ZZZ99. Early M 64.07 engines (1995–1996) feature silver cam covers with visible hydraulic lifters; 1997–1998 units have black cam covers and revised lifter bores. Do not confuse with M 64.09 (3.8L) or Turbo variants—M 64.07 always has 100.0 mm bore and twin catalytic converters with secondary air injection ports.
The M 64.07's primary reliability risk is oil sludge buildup in the timing chain housing and hydraulic lifter wear, with elevated incidence in high-mileage or infrequently maintained examples. Porsche internal service data from 1999 indicated sludge-related timing noise in ~18% of pre-1997 engines before 100,000 km, while UK DVSA MOT records show emissions failures linked to secondary air injection degradation. Extended oil intervals and urban driving accelerate sludge formation, making oil discipline critical.
Analysis derived from Porsche technical bulletins (1995–1998) and UK DVSA failure statistics (1998–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE M-64-07.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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