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 application…
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 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.
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.
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As a non-production, motorsport-derived engine, it was engineered for limited-life track use. With meticulous care—RON 98 fuel, strict 7,500 km oil changes using 10W-60, and proper warm-up—it can endure high-RPM operation. All known units are preserved in Porsche’s heritage collection and not driven regularly.
Top issues include valve spring fatigue from sustained high RPM, Nikasil bore degradation from fuel contamination, dry-sump oil aeration from overfilling, and Motronic throttle drift. These are documented in Porsche Technical Bulletin PTB‑99‑12 and Motorsport PDK-001 notes.
None in production form. It was used only in internal 911 GT3 RS (996) Clubsport evaluation units and 996 RSR prototype mules (1999–2001). No road-legal or customer cars were ever equipped with this engine variant.
It is already a motorsport-calibrated engine producing 350 PS. Minor gains are possible via ECU remap, but the 11.0:1 compression and air-cooling limit further tuning. Its historical and experimental status makes preservation the priority over modification.
Approximately 15–18 L/100km (16–19 mpg UK) in mixed driving due to high-revving calibration. Track use easily exceeds 20 L/100km. Highway cruising is not representative of its intended usage profile.
Yes. The M 64 series uses an interference valvetrain design—piston-to-valve contact will occur if timing fails. However, the hydraulic chain tensioners are robust with correct oil maintenance.
Porsche specifies 10W-60 synthetic oil meeting API SL/CF or modern Porsche C30 standards. High thermal stability is essential for dry-sump operation at high RPM. Change every 7,500 km or annually, per TIS LUB-M64R.
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