The Porsche M 44.07 is a 2,480 cc, naturally aspirated inline‑four petrol engine produced between 1996 and 2000. It features sequential multi‑point fuel injection, DOHC with hydraulic valve adjusters, and a maintenance‑free timing chain. In standard form it delivers 110–118 kW (150–160 PS) and 225–240 Nm of torque, engineered for cost‑effective performance in entry‑level sports applications.
Fitted exclusively to the 986 — generation Boxster base model, the M 44.0…
All production years (1996–2000) meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/POR1998).
The Porsche M 44.07 is a 2,480 cc naturally aspirated inline‑four petrol engine engineered exclusively for the 986-generation Boxster (1996–2000). It combines Bosch Motronic 5.2 sequential fuel injection with dual overhead camshafts to deliver linear throttle response and mid‑range flexibility. Designed to meet Euro 2 emissions standards, it prioritizes reliability and serviceability in Porsche’s first mid‑engine roadster.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,480 cc | |
Fuel type | Petrol (RON 95 min) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 104.0 mm | |
Power output | 110–118 kW (150–160 PS) | |
Torque | 225–240 Nm @ 4,000–5,000 rpm | |
Fuel system | Bosch Motronic 5.2 sequential multi-point injection | |
Emissions standard | Euro 2 | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with hydraulic tensioners | |
Oil type | Porsche A40 10W-40 (or ACEA A3/B3 10W-40) | |
Dry weight | 142 kg |
The Porsche M 44.07 was used exclusively in the 986-generation Boxster platform with mid-mounted, longitudinal orientation and no external licensing beyond the initial Toyota co-development. This engine features platform-specific intake manifolds, dry-sump oiling (shared sump with transmission), and bespoke engine mounts. From 1999, Porsche introduced an updated intermediate shaft bearing with enhanced grease retention, creating minor service distinctions documented in technical bulletins.
The M 44.07's primary reliability risk is intermediate shaft (IMS) bearing wear in early builds, with elevated incidence in low-RPM, short-trip driving. Porsche internal service data from 1999 indicated a measurable uptick in IMS-related noise before 100,000 km in urban-driven vehicles, while UK DVSA statistics show minimal emissions-related MOT failures due to robust catalyst design. Extended low-RPM operation without periodic high-RPM cycling accelerates bearing wear, making oil quality and driving pattern critical.
Analysis derived from Porsche technical bulletins (1996–2000) and UK DVSA failure statistics (1998–2005). Repair procedures should follow manufacturer guidelines.
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Generally yes—with proactive maintenance. The inline-four is simpler and more robust than the contemporary M96 flat-six. Early units (1996–1998) have IMS bearing concerns, but 1999–2000 updates improved durability. With regular oil changes and occasional high-RPM driving, the M 44.07 offers excellent longevity and lower ownership costs.
IMS bearing wear in early builds, rear main seal leaks, ignition coil failures, and coolant tank cracking. All are well-documented in Porsche service bulletins and are largely preventable with proper maintenance and part updates.
Exclusively the 1996–2000 Boxster (986) 2.5L. This was Porsche’s only production inline-four engine, developed in collaboration with Toyota. It is not used in 911, Cayenne, or any other model line.
Limited potential. ECU remaps and exhaust upgrades typically yield +10–15 kW. Major gains require forced induction or engine swaps (e.g., to flat-six), which is common in enthusiast circles. Most owners preserve the engine’s simplicity and reliability.
In combined driving, expect 9.0–10.5 L/100km (31–27 mpg UK). Highway cruising can drop to ~7.2 L/100km (39 mpg UK). Real-world figures vary with driving style—gentle use may approach 8 L/100km, while spirited driving can exceed 12 L/100km.
Yes. The M 44.07 is an interference design. Timing chain failure—though rare due to its robust design—could cause piston-to-valve contact. However, the chain is engineered for life with proper oil changes.
Porsche specifies A40 10W-40 or ACEA A3/B3 10W-40 synthetic oil. Change every 10,000 km or annually. Proper oil ensures IMS bearing lubrication and timing chain longevity.
Comprehensive technical documentation and regulatory references
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