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 44.07 was developed in partnership with Toyota (sharing architecture with the 3S-GE) to reduce development costs while maintaining Porsche driving dynamics. Emissions compliance was achieved through three‑way catalytic converters and precise lambda control, allowing Euro 2 compliance across all production years.
One documented concern is intermediate shaft (IMS) bearing wear, though less severe than in six‑cylinder M96 engines. This issue, noted in Porsche Technical Service Bulletin TSIB‑986‑03, stems from inadequate lubrication of the sealed bearing during sustained low‑RPM operation. Later 1999–2000 units received a revised IMS bearing with improved grease retention.
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 M 44.07 delivers accessible performance with minimal complexity, making it one of Porsche’s most serviceable engines. Regular oil changes with 10W-40 A3/B3 oil every 10,000 km are essential to maintain IMS bearing life and timing chain lubrication. The engine benefits from occasional high-RPM operation to circulate oil through the intermediate shaft. Pre-1999 units are more susceptible to IMS wear; 1999–2000 models feature an improved bearing. Spark plug and coil maintenance is straightforward due to top-mounted ignition components.
Oil Specs: Requires Porsche A40 10W-40 or ACEA A3/B3 equivalent (Porsche Lubricants Guide 1998).
Emissions: Euro 2 compliance applies to all 1996–2000 models (VCA Type Approval #VCA/EMS/POR1998).
Power Ratings: Measured per ECE R85. Power figures assume RON 95 fuel (Porsche PIWIS Doc. ENG-M44-1996).
Porsche PIWIS Documentation: ENG-M44-1996, FUE-M44-1997, TIM-M44-1996
Porsche Technical Bulletin TSIB-986-03
VCA Type Approval Database (VCA/EMS/POR1998)
EU Regulation (EC) No 83/2005 (Euro 2 reference)
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.
Engine code M 44.07 is stamped on the left side of the engine block near the exhaust manifold (Porsche PIWIS ENG-ID-M44). VIN 7th digit '4' indicates 2.5L four-cylinder in 986 platform. Pre-1999 models use IMS bearing with part number 996.07.200.00; post-1999 use revised 996.07.200.01 with improved grease seal. Visual cue: black plastic valve cover with '2.5' embossing. Do not confuse with M 44.01 (2.7L) or flat-six M96 engines. IMS bearing condition should be assessed during major service per TSIB-986-03.
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.
Find answers to most commonly asked questions about PORSCHE M-44-07.
Comprehensive technical documentation and regulatory references
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