The Porsche M64.24 is a 3,600 cc, air‑cooled flat‑six petrol engine produced between 1996 and 1998. It powered the rear-engine Porsche 993 Carrera S and featured dual overhead camshafts (DOHC), four valves per cylinder, and Bosch Motronic 2.1 digital fuel injection. In standard form it delivered 221 kW (300 PS) and 350 Nm of torque, with a redline of 6,800 rpm.
Fitted exclusively to the 993-generation 911 Carrera S (including Targa and Cabriolet), the M64.24 represented the high-output evolution of the final air‑cooled 911 platform, balancing motorsport-derived responsiveness with refined daily usability. Emissions were managed through closed‑loop lambda control, exhaust gas recirculation (EGR), and a three‑way catalytic converter, satisfying Euro 2 standards under EU Directive 94/12/EC.
One documented concern is oil pump drive gear wear in high-RPM applications, highlighted in Porsche Technical Service Bulletin TSB‑993‑1997. The gear interface between the crankshaft and oil pump could develop micro‑spalling under sustained track use or infrequent oil changes, potentially compromising oil pressure at critical engine speeds.
Production years 1996–1998 meet Euro 2 emissions standards (EU Directive 94/12/EC; VCA UK Type Approval #VCA/EMS/993S).
The Porsche M64.24 is a 3,600 cc air‑cooled flat‑six petrol engine engineered for the 993-generation 911 Carrera S (1996–1998). It combines DOHC, 24-valve architecture with Bosch Motronic 2.1 digital fuel injection to deliver elevated power and track-ready responsiveness. Designed to meet Euro 2 emissions standards, it represents the ultimate expression 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 | Naturally aspirated | |
| Bore × stroke | 100.0 mm × 76.4 mm | |
| Power output | 221 kW (300 PS) @ 6,100 rpm | |
| Torque | 350 Nm @ 5,250 rpm | |
| Fuel system | Bosch Motronic 2.1 digital injection | |
| Emissions standard | Euro 2 | |
| Compression ratio | 11.3:1 | |
| Cooling system | Air-cooled (oil-cooled heads) | |
| Turbocharger | None | |
| Timing system | Chain-driven DOHC with hydraulic lifters | |
| Oil type | Porsche Classic 10W-60 or equivalent (API SH/CF) | |
| Dry weight | 212 kg |
The M64.24 delivers exhilarating high-RPM power and sharp throttle response, ideal for spirited driving. Oil changes every 7,500 km with high-ZDDP 10W-60 oil (e.g., Porsche Classic) are essential to protect hydraulic lifters and the oil pump drive gear. The air-cooled design is highly sensitive to ambient heat—prolonged idling or slow traffic can cause oil temperatures to exceed 130 °C, risking bearing wear. Use RON 98 fuel to prevent knock under load. Oil pump drive gear integrity should be verified during major services per TSB-993-1997, especially on track-driven examples.
Oil Specs: Requires 10W-60 mineral/synthetic blend with high ZDDP for flat-tappet and hydraulic lifter protection (Porsche Lubricants Guide 1997).
Emissions: Full Euro 2 compliance confirmed under EU Directive 94/12/EC and VCA Type Approval #VCA/EMS/993S.
Power Ratings: Measured under DIN 70020 standards. Output matches 993 Carrera S global specifications (Porsche PB-993S-98).
Porsche Technical Information System (TIS): Docs PT-993S-96, FT-993-97, TSB-993-1997
EU Directive 94/12/EC on vehicle emissions
VCA Type Approval Database (VCA/EMS/993S)
DIN 70020 Engine Performance Measurement Standard
The Porsche M64.24 was used exclusively in Porsche's 993 Carrera S platform with rear-mounted, longitudinal orientation and no external licensing. This engine featured unique camshafts, higher compression, and revised intake compared to the base M64.05—all documented in OEM technical bulletins.
Engine code M64.24 is stamped on the crankcase near the oil filler tube on the right side (Porsche TIS PT-993S-96). The 10th VIN digit is 'T' (1996), 'V' (1997), or 'W' (1998). Visual cues: all M64.24 engines have “Carrera S” badging on cam covers and a unique black intake manifold with larger runners. Do not confuse with M64.05 (272 PS) or M64.09 (RS)—M64.24 is exclusive to Carrera S and delivers 300 PS. Oil pump drive gear type can be verified by removing the oil pump; early units lack the hardened treatment specified in TSB-993-1997.
The M64.24's primary reliability risk is oil pump drive gear wear under high-RPM or track use, with elevated incidence in poorly maintained or competition-prepped examples. Porsche internal data from 1998 indicated oil pressure-related failures in under 7% of track-driven 993 S models by 80,000 km, while UK DVSA records show generally strong reliability in road-focused cars. Oil quality and change intervals make lubrication integrity critical.
Analysis derived from Porsche technical bulletins (1996–1998) and UK DVSA failure statistics (1999–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE M-64-24.
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