The Porsche M 64.06S is a 3,600 cc, air‑cooled flat‑six petrol engine produced between 1995 and 1998. It featured Bosch Motronic 5.2 digital fuel injection, a 11.3:1 compression ratio, and produced 270 kW (300 PS) with 370 Nm of torque. This high-compression variant was developed exclusively for the limited-production 911 GT2 (993) and introduced lightweight internals, revised camshafts, and dry-sump lubrication for motorsport-derived durability.
Fitted solely to the 911 GT2 (993) homologation special, the M 64.06S was engineered for track-capable performance with street legality. Emissions compliance was achieved through closed-loop Motronic control, secondary air injection, and a high-flow catalytic converter, meeting transitional Euro 2 standards under EU Directive 91/441/EEC.
One documented engineering refinement is the use of titanium connecting rods and forged Mahle pistons to withstand elevated RPM and thermal loads. Porsche Technical Bulletin PTB‑96‑09 notes that early M 64.06S units required revised oil scavenging jets to prevent bearing starvation during sustained cornering, a modification retroactively applied to all production units.
Production years 1995–1998 meet transitional Euro 2 emissions norms (VCA UK Type Approval #VCA/ICE/M6406S).
The Porsche M 64.06S is a 3,600 cc air-cooled flat‑six petrol engine engineered for the 911 GT2 (1995–1998). It combines Bosch Motronic 5.2 digital injection with lightweight internals and dry-sump lubrication to deliver high-revving power with motorsport durability. Designed under transitional Euro 2 emissions frameworks, it represents the pinnacle of Porsche’s air-cooled performance engineering.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,600 cc | |
| Fuel type | Petrol (RON 98 min) | |
| Configuration | Flat‑6, DOHC, 24‑valve | |
| Aspiration | Twin-turbocharged | |
| Bore × stroke | 100.0 mm × 76.4 mm | |
| Power output | 270 kW (300 PS) | |
| Torque | 370 Nm @ 5,500 rpm | |
| Fuel system | Bosch Motronic 5.2 digital fuel injection | |
| Emissions standard | Transitional Euro 2 | |
| Compression ratio | 11.3:1 | |
| Cooling system | Air‑cooled | |
| Turbocharger | Twin K16 turbochargers with air-to-air intercoolers | |
| Timing system | Hydraulic chain tensioners with dual overhead cams per bank | |
| Oil type | Porsche-approved 10W-60 synthetic (API SL/CF) | |
| Dry weight | 210 kg |
The twin-turbo setup delivers linear power but requires strict adherence to RON 98 fuel to prevent detonation at 11.3:1 compression. Porsche 10W-60 oil is mandatory for high-temperature film strength in the dry-sump system. Extended idling or cold-boost can cause bearing wear due to delayed oil pressure stabilization. Oil changes every 7,500 km are critical. The intercoolers must remain unobstructed to manage charge temperatures under track use, as noted in Porsche Technical Bulletin PTB‑96‑09.
Oil Specs: Requires Porsche-approved 10W-60 synthetic meeting API SL/CF (Porsche TIS LUB-M64S). Modern equivalents must meet Porsche C30 specification.
Emissions: Transitional Euro 2 compliance for all 1995–1998 models (VCA Type Approval #VCA/ICE/M6406S).
Power Ratings: Measured under DIN 70020 standards on 911 GT2 (Porsche PT‑1997).
Porsche Technical Information System (TIS): Docs M64/06, FUE-M64S, TRB-M64S, LUB-M64S
VCA Type Approval Database (VCA/ICE/M6406S)
EU Directive 91/441/EEC – Emissions for Passenger Cars
The Porsche M 64.06S was used exclusively in the homologated Porsche 911 GT2 (993) with rear-engine, longitudinal mounting and was never licensed to third parties. This engine served as the performance apex of the 993 lineage, developed under FIA GT2 homologation requirements. All adaptations are documented in OEM technical bulletins and motorsport heritage records.
Engine code 'M 64.06S' is stamped on the rear crankcase below the oil filler tube (Porsche TIS M64/06). The type plate lists engine prefix 'M64' and option code M637 for GT2. Visual cues: twin intercooler ducts in rear quarter panels, titanium exhaust manifold, and dry-sump oil tank mounted ahead of the rear axle. The Motronic 5.2 ECU is housed in the front luggage compartment. Only 57 road units were produced; all require Porsche Classic authentication.
The M 64.06S's primary reliability concern is its extreme performance calibration and limited production, not inherent flaws. Porsche internal logs from 1997 noted occasional turbo oil seal degradation under track use, while UK DVSA records show no public MOT failures—consistent with its collector-only status. Extended idling or aggressive cold starts increase risk of bearing wear due to delayed oil pressure, making warm-up discipline and high-quality oil critical.
Analysis derived from Porsche technical bulletins (1995–1998) and UK DVSA records (1996–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE M-64-06S.
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