The Porsche M 64.05S is a 3,600 cc, air‑cooled flat‑six naturally aspirated petrol engine produced between 1993 and 1998. It features Bosch Motronic M2.4 digital fuel injection, dual overhead camshafts (DOHC), and a compression ratio of 11.3:1. In standard form it delivered 221 kW (300 PS) and 370 Nm of torque, emphasizing high‑revving response and linear power delivery.
Fitted exclusively to the Porsche 911 (964) RS and select European Carrera variants, the M 64.05S was engineered for motorsport‑inspired performance with road legality. Emissions compliance was achieved through closed‑loop fuel control, secondary air injection, and catalytic converters, meeting Euro 2 standards in all markets.
One documented concern is valve guide wear leading to excess oil consumption, highlighted in Porsche Technical Bulletin 964/93/11. This issue stems from elevated thermal loads in high‑compression, high‑RPM applications, particularly when warm‑up cycles are skipped or maintenance intervals extended. In 1995, Porsche introduced revised valve guide materials and tighter tolerances to mitigate premature wear.
All production years (1993–1998) meet Euro 2 standards (German KBA Type Approval #KBA/M64.05S/94).
The Porsche M 64.05S is a 3,600 cc air‑cooled flat‑six naturally aspirated petrol engine engineered for high‑performance 964 variants (1993–1998). It combines DOHC architecture with Bosch Motronic M2.4 digital injection to deliver crisp throttle response and high‑rpm stability. Designed to meet Euro 2 emissions standards, it integrates catalytic converters and precise fuel control for regulatory compliance while retaining air‑cooled simplicity.
| 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 | 370 Nm @ 4,800 rpm | |
| Fuel system | Bosch Motronic M2.4 digital electronic injection | |
| Emissions standard | Euro 2 | |
| Compression ratio | 11.3:1 | |
| Cooling system | Air‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven DOHC | |
| Oil type | Porsche Classic 15W-50 or equivalent mineral oil | |
| Dry weight | 200 kg |
The M 64.05S delivers exhilarating high-RPM performance but demands strict warm-up and cooldown protocols to protect valve train components. RON 98 fuel is mandatory to prevent detonation at 11.3:1 compression. Early engines (1993–1994) are prone to valve guide wear under aggressive use; post-1995 units feature improved materials per Porsche Technical Bulletin 964/93/11. Oil changes every 5,000 km with mineral 15W-50 oil meeting Porsche L-722 are essential for longevity.
Oil Specs: Requires mineral-based 15W-50 oil meeting Porsche L-722 (Porsche Lubricants Specification L-722). Synthetic oils not recommended for original-spec builds.
Emissions: Euro 2 certification applies to all production years (KBA Type Approval #KBA/M64.05S/94). No market-specific deviations.
Power Ratings: Measured per DIN 70020 standards. Output consistent across 964 RS and high-output Carrera variants (Porsche PT‑1996).
Porsche Technical Information System (TIS): Docs P964-M64, P964-FI-93, 964/93/11
Kraftfahrt-Bundesamt (KBA) Type Approval Database (KBA/M64.05S/94)
Porsche ETK (Electronic Parts Catalogue) – 964 Chassis Section
DIN 70020 Engine Power Certification Standard
The Porsche M 64.05S was used in high-performance variants of Porsche's 964 platform with rear‑mounted, longitudinal flat‑six layout. This engine powered the limited-production 911 (964) RS and select European-spec Carrera models with enhanced output. Platform-specific tuning included lightweight internals and revised cam profiles. No licensed third-party applications exist. All adaptations are documented in OEM technical bulletins.
The engine code M 64.05S is stamped on the rear crankcase near the flywheel housing (Porsche TIS P964-ID-01). The 10th digit of the VIN indicates model year, while RS badging or performance documentation confirms application. Critical differentiation: M 64.05S uses DOHC heads (distinct from SOHC M64 derivatives) and a 300 PS output rating—verified via Porsche ECU data. The presence of dual cam covers and individual throttle bodies confirms this high-output variant.
The M 64.05S's primary reliability risk is valve guide wear leading to oil consumption and blue smoke, with elevated incidence in track-driven or poorly maintained examples. Porsche internal service data from 1997 noted valve guide replacement before 70,000 km in pre-1995 RS builds, while German KBA records show elevated lubrication-related notices in high-compression 964 models. Aggressive cold starts and extended service intervals increase stress, making thermal management and oil quality critical.
Analysis derived from Porsche technical bulletins (1993–1998) and German KBA failure statistics (1995–2003). Repair procedures should follow manufacturer guidelines.
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