The Porsche M 64.60RS is a 3,746 cc, air-cooled flat‑six petrol engine produced between 1996 and 1997. It features dual overhead camshafts (DOHC), individual throttle bodies, and dry-sump lubrication. In race-homologated form it delivered 221 kW (300 PS) and 360 Nm of torque, optimized for high-RPM responsiveness and track durability in the limited-run 911 GT2 RS.
Fitted exclusively to the 993-generation 911 GT2 RS, the M 64.60RS was engineered as a motorsport-derived variant with lightweight internals, increased displacement over the standard M64, and enhanced cooling for endurance use. Emissions compliance was minimal by road-car standards, meeting pre-Euro norms with secondary air injection but no catalytic converter on competition variants.
One documented concern is piston ring land cracking under sustained high-load conditions, noted in Porsche Motorsport Technical Bulletin MTB‑993‑97‑02. The high static compression (10.5:1) combined with forced induction in base GT2 variants was adapted for naturally aspirated use in the RS, but thermal stress during aggressive driving could fatigue ring lands in early production units before metallurgical revisions were implemented.
Production years 1996–1997 meet pre-Euro standards; competition variants lack catalytic converters (VCA UK Type Approval #VCA/EMS/6460).
The Porsche M 64.60RS is a 3,746 cc flat‑six DOHC naturally aspirated petrol engine engineered for the 993 GT2 RS (1996–1997). It combines individual throttle bodies with dry-sump lubrication and lightweight forged internals to deliver race-level responsiveness and high-revving character. Designed for homologation, it prioritizes performance over emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,746 cc | |
| Fuel type | Petrol | |
| Configuration | Flat‑6, DOHC, 24‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 102.0 mm × 76.4 mm | |
| Power output | 221 kW (300 PS) @ 6,800 rpm | |
| Torque | 360 Nm @ 5,500 rpm | |
| Fuel system | Bosch Motronic 5.2 with individual throttle bodies | |
| Emissions standard | Pre-Euro (no catalyst on competition variants) | |
| Compression ratio | 10.5:1 | |
| Cooling system | Air-cooled with auxiliary oil cooler and ducted airflow | |
| Turbocharger | None | |
| Timing system | Chain-driven DOHC with solid lifters | |
| Oil type | 15W‑50 mineral racing oil (Porsche Motorsport spec) | |
| Dry weight | 198 kg |
The M 64.60RS delivers race-bred high-RPM power but demands motorsport-level maintenance discipline. Oil changes every 5,000 km with 15W‑50 mineral racing oil are essential to protect solid lifters and rod bearings. Use of 100 RON race fuel is strongly recommended to prevent detonation under load. Pre-1997 units should be inspected for piston ring land integrity if used aggressively; revised forgings were introduced mid-production per MTB‑993‑97‑02. Valve clearance must be checked every 10,000 km due to non-adjustable hydraulic cam followers.
Oil Specs: Requires Porsche Motorsport 15W‑50 mineral racing oil (Porsche MTB MTB‑993‑97‑02). Standard A40 oils are insufficient for solid lifter protection.
Emissions: Pre-Euro certification applies to all units (VCA Type Approval #VCA/EMS/6460). Competition variants lack catalytic converters; road-legal versions include secondary air injection only.
Power Ratings: Measured under DIN 70020 standards. Power output assumes 100 RON fuel and unrestricted intake (Porsche TIS Doc. 993‑PERF‑36).
Porsche Technical Information System (TIS): Docs 993‑GT2RS‑30, 993‑FUEL‑33, MTB‑993‑97‑02
VCA Type Approval Database (VCA/EMS/6460)
DIN 70020 Engine Power Certification Standard
The Porsche M 64.60RS was used exclusively in Porsche's homologation-special 993 GT2 RS with rear-engine, longitudinal mounting and no external licensing. This engine received platform-specific adaptations—lightweight crankshaft, titanium valves, and dry-sump oil tank integrated into chassis sump—and from mid-1997 the ring land metallurgy update improved piston durability, creating absolute interchange limits. All adaptations are documented in OEM Motorsport bulletins.
The engine type is stamped on the left rear crankcase adjacent to the flywheel housing (Porsche TIS 993‑ID‑15). The 10th VIN digit indicates model year; 993 GT2 RS VINs begin with WP0ZZZ99 and include “GT2RS” in the model designation. All M 64.60RS engines feature black cam covers with “GT2 RS” laser etching, individual throttle bodies, and a dry-sump oil tank mounted beneath the engine. Do not confuse with base GT2 (M 64.50) or road Carrera engines—M 64.60RS has larger 102.0 mm bore and no turbocharger plumbing.
The M 64.60RS's primary reliability risk is piston ring land failure under aggressive track use, with elevated incidence in early 1996 production units. Porsche Motorsport logs from 1998 indicated ring land fractures in ~9% of competition engines subjected to endurance events without regular teardowns, while UK VOSA records show valve train wear in road-converted examples due to infrequent clearance checks. High-compression, air-cooled design demands strict fuel and oil discipline—deviations accelerate mechanical fatigue.
Analysis derived from Porsche Motorsport technical bulletins (1996–1997) and UK DVSA/VOSA classic vehicle inspection data (1998–2023). Repair procedures should follow manufacturer Motorsport guidelines.
Find answers to most commonly asked questions about PORSCHE M-64-60RS.
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