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 t…
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 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.
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.
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The M64.24 is robust for road use but demands attentive maintenance under high-RPM or track conditions. Oil pump drive gear wear is the main concern in competition applications, but road cars rarely encounter this if serviced properly. With strict 7,500 km oil intervals using 10W-60 and avoidance of overheating, it can exceed 150,000 km reliably.
Top issues include oil pump drive gear wear (track use), hydraulic lifter degradation, Motronic sensor faults, and oil cooler system leaks. These are documented in Porsche service bulletin TSB-993-1997. Oil quality and thermal management are key preventative factors.
Exclusively the 1996–1998 Porsche 911 Carrera S (993), including Targa and Cabriolet body styles. It was never used in base Carrera, Turbo, RS, or GT2 models. All are rear-engine, air-cooled layouts with 300 PS output.
Modestly. Stage 1 (ECU chip, exhaust, intake) yields ~315–320 PS. Full builds with cams, head porting, and higher compression can reach 340+ PS. However, stock internals—especially the oiling system—limit safe tuning; upgraded oil pump and cooler are recommended for aggressive builds.
Typical consumption is 14–16 L/100km (20–18 mpg UK) in mixed driving. Highway cruising can reach 11.5 L/100km (24 mpg UK). The engine prioritizes performance over efficiency, typical for a high-output sports car of its era.
Yes. The M64.24 is an interference engine. If the timing chains fail or jump, pistons can contact open valves, causing severe internal damage. However, the chain system is robust if maintained with quality oil.
Porsche specifies 10W-60 mineral or synthetic blend meeting API SH/CF with high ZDDP content. Change every 7,500 km or annually. Porsche Classic 10W-60 is strongly recommended for hydraulic lifter and cam protection.
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