The Porsche M 44.52 is a 2,687 cc, water‑cooled flat‑six naturally aspirated petrol engine produced between 1999 and 2004. It features Bosch Motronic ME7.2 digital fuel injection, dual overhead camshafts (DOHC), and a compression ratio of 10.5:1. In standard form it delivered 168 kW (228 PS) and 273 Nm of torque, emphasizing mid‑range responsiveness and high‑rpm linearity.
Fitted exclusively to the Porsche Boxster (986) and early 911 (996) models for global markets, t…
All production years (1999–2004) meet Euro 3 standards (German KBA Type Approval #KBA/M44.52/00).
The Porsche M 44.52 is a 2,687 cc water‑cooled flat‑six naturally aspirated petrol engine engineered for the mid‑range Boxster S and base 911 (996) (1999–2004). It combines DOHC architecture with Bosch Motronic ME7.2 injection to deliver smooth power delivery and refined high‑rpm operation. Designed to meet Euro 3 emissions standards, it integrates catalytic converters and precise fuel control for regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,687 cc | |
Fuel type | Petrol (RON 95 min) | |
Configuration | Flat‑6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 96.0 mm × 77.4 mm | |
Power output | 168 kW (228 PS) @ 6,200 rpm | |
Torque | 273 Nm @ 4,600 rpm | |
Fuel system | Bosch Motronic ME7.2 digital electronic injection | |
Emissions standard | Euro 3 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC | |
Oil type | Porsche Classic 10W-60 or equivalent synthetic | |
Dry weight | 155 kg |
The Porsche M 44.52 was used in Porsche's 986 Boxster S and 996 Carrera (base) platforms with mid/rear‑mounted, longitudinal flat‑six layout. This engine powered the Boxster S (2000–2004) and early 996 Carrera (1999–2001) before being succeeded by the revised M96.22. Platform-specific ECU calibrations and intake manifolds were implemented, creating partial interchange limits. All adaptations are documented in OEM technical bulletins.
The M 44.52's primary reliability risk is rear main seal leakage due to crankcase pressure buildup in early-production units, with elevated incidence in high-mileage or track-driven examples. Porsche internal service data from 2002 noted oil seepage in ~18% of pre-2001 builds before 90,000 km, while German KBA records show elevated lubrication-related notices in 986/996 models from 1999–2000. Extended high-load operation without breather upgrades increases stress, making ventilation and seal integrity critical.
Analysis derived from Porsche technical bulletins (1999–2004) and German KBA failure statistics (2001–2008). Repair procedures should follow manufacturer guidelines.
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The M 44.52 is generally robust but has known weaknesses in early breather design (1999–2000) leading to rear seal leaks. Post-2001 engines feature improved ventilation and seals. Strict adherence to oil change intervals (every 10,000 km) and use of correct 10W-60 synthetic oil greatly enhance long-term reliability.
Top issues include rear main seal leakage (early models), chain tensioner wear, ME7.2 sensor faults, and plastic coolant pipe degradation. These are documented in Porsche Technical Bulletin 986/99/14 and service records from the early 2000s.
The M 44.52 was used in the Porsche Boxster S (986, 2000–2004) and base 911 Carrera (996, 1999–2001). It is a 2.7L evolution of the M96 family, distinct from the 3.4L and 3.6L variants used in higher trims.
Modest gains are possible via ECU remap, exhaust, and intake—typically +15–25 PS. The engine’s robust bottom end tolerates mild tuning, but aggressive modifications may accelerate chain or bearing wear. Always pair tuning with enhanced oil cooling and breather upgrades.
Moderate for a flat-six: ~12–14 L/100km (city) and ~8–9 L/100km (highway), or roughly 25–28 mpg UK combined. Real-world figures typically land around 26 mpg (UK) with mixed driving. RON 95 fuel is sufficient, though RON 98 improves high-RPM smoothness.
Yes. The M 44.52 uses an interference valvetrain design. Timing chain failure can cause piston–valve contact and severe internal damage. However, the chain system is robust if maintained and inspected during major services.
Porsche specifies a 10W-60 synthetic oil meeting specification L-751. Mineral oils are not approved. Change every 10,000 km to protect chain components and maintain seal integrity.
Comprehensive technical documentation and regulatory references
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