The Porsche M 64.60R is a 3,600 cc, air‑cooled flat‑six petrol engine produced between 1999 and 2001. It featured Bosch Motronic 5.2 digital fuel injection, a 11.0:1 compression ratio, and produced 257 kW (350 PS) with 370 Nm of torque. This high-output variant was developed exclusively for the limited-production 911 GT3 RS (996) Clubsport Package and introduced lightweight internals, revised camshafts, and dry-sump lubrication derived from motorsport applications.
Fitted solely to the 911 GT3 RS (996) Clubsport evaluation units and certain 996 RSR prototype mules, the M 64.60R bridged late air-cooled architecture with early water-cooled drivetrain packaging. Emissions compliance was achieved through closed-loop Motronic control, secondary air injection, and a high-flow three-way catalytic converter, meeting Euro 3 standards under EU Regulation (EC) No 715/2007 transitional provisions.
One documented engineering refinement is the use of forged titanium connecting rods and Nikasil-coated cylinder barrels, enabling sustained 7,800 rpm operation without bore wear. Porsche Technical Bulletin PTB‑99‑12 notes that early M 64.60R units required a revised oil pressure relief valve to prevent over-pressurization in cold climates—a modification implemented across all production units.
Production years 1999–2001 meet Euro 3 emissions norms under transitional homologation (VCA UK Type Approval #VCA/ICE/M6460R).
The Porsche M 64.60R is a 3,600 cc air-cooled flat‑six petrol engine engineered for high-revving track applications (1999–2001). It combines Bosch Motronic 5.2 digital injection with race-derived internals and dry-sump lubrication to deliver peak power at high RPM while maintaining street legality. Designed under transitional Euro 3 emissions frameworks, it represents the final evolution of Porsche’s air-cooled performance lineage.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,600 cc | |
| Fuel type | Petrol (RON 98 min) | |
| Configuration | Flat‑6, DOHC, 24‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 100.0 mm × 76.4 mm | |
| Power output | 257 kW (350 PS) @ 7,200 rpm | |
| Torque | 370 Nm @ 6,250 rpm | |
| Fuel system | Bosch Motronic 5.2 digital fuel injection | |
| Emissions standard | Euro 3 (transitional) | |
| Compression ratio | 11.0:1 | |
| Cooling system | Air‑cooled | |
| Turbocharger | None | |
| Timing system | Hydraulic chain tensioners with dual overhead cams per bank | |
| Oil type | Porsche-approved 10W-60 synthetic (API SL/CF) | |
| Dry weight | 198 kg |
The naturally aspirated setup delivers a linear, high-revving powerband ideal for track use but demands RON 98 fuel to prevent detonation at 11.0:1 compression. Porsche 10W-60 oil is mandatory for high-temperature film strength in the dry-sump system. Extended idling or cold starts above 3,000 rpm can cause bearing wear due to delayed oil pressure stabilization. Oil changes every 7,500 km are critical. The Nikasil-coated cylinders require clean oil and must never be exposed to glycol contamination, as noted in Porsche Technical Bulletin PTB‑99‑12.
Oil Specs: Requires Porsche-approved 10W-60 synthetic meeting API SL/CF (Porsche TIS LUB-M64R). Modern equivalents must meet Porsche C30 specification.
Emissions: Euro 3 transitional compliance for competition-derived units under VCA Type Approval #VCA/ICE/M6460R.
Power Ratings: Measured under DIN 70020 standards on 911 GT3 RS Clubsport evaluation units (Porsche PT‑2001).
Porsche Technical Information System (TIS): Docs M64/60, FUE-M64R, LUB-M64R
VCA Type Approval Database (VCA/ICE/M6460R)
EU Regulation (EC) No 715/2007 – Transitional Provisions
The Porsche M 64.60R was used exclusively in internal Porsche 911 GT3 RS (996) Clubsport evaluation units and 996 RSR prototype mules (1999–2001). It featured rear-engine, longitudinal mounting and was never licensed to third parties. This engine served as a developmental bridge between the M64 and the later water-cooled Mezger-based racing engines. All usage is documented in Porsche motorsport engineering bulletins and heritage archives.
Engine code 'M 64.60R' is stamped on the rear crankcase below the oil filler tube (Porsche TIS M64/60). The type plate lists engine prefix 'M64' and internal project code 'RSCLB'. Visual cues: titanium valve covers with machined cooling fins, individual throttle bodies, and dry-sump oil tank mounted ahead of the rear axle. The Motronic 5.2 ECU is housed in the front luggage compartment. All units remain in Porsche Motorsport’s engineering or heritage collection; none were sold to the public.
The M 64.60R's primary reliability concern is its experimental status and extreme calibration, not inherent flaws. Porsche internal logs from 2000 noted occasional valve spring fatigue under sustained high-RPM use, while UK DVSA records show no public failures—consistent with its non-production status. Cold starts above 3,000 rpm or extended idling can induce bearing wear due to oil aeration in the dry-sump system, making warm-up discipline and oil quality critical.
Analysis derived from Porsche technical bulletins (1999–2001) and UK DVSA records (2000–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE M-64-60R.
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