The Porsche M 44.02 is a 2,480 cc, water‑cooled inline‑four petrol engine produced between 1996 and 1998. It features a dual overhead camshaft (DOHC) valvetrain, 16 valves, and Bosch Motronic M5.2 sequential fuel injection. In standard form it delivered 103 kW (140 PS) at 5,800 rpm, with peak torque of 220 Nm at 4,200 rpm.
Fitted exclusively to the Porsche Boxster (986) in base trim and select markets, the M 44.02 was engineered for entry‑level sports driving with linear pow…
Production years 1996–1998 meet US EPA Tier 1 standards; European variants meet Euro 2 .
The Porsche M 44.02 is a 2,480 cc inline‑four DOHC petrol engine engineered for entry‑level sports applications (1996–1998). It combines water cooling with sequential fuel injection and a cross‑flow cylinder head to deliver smooth, linear response and compact packaging. Designed to meet US EPA Tier 1 and Euro 2 emissions standards, it balances affordability with Porsche driving dynamics.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,480 cc | |
Fuel type | Petrol (RON 95 min) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 95.0 mm × 88.0 mm | |
Power output | 103 kW (140 PS) @ 5,800 rpm | |
Torque | 220 Nm @ 4,200 rpm | |
Fuel system | Bosch Motronic M5.2 sequential injection | |
Emissions standard | US EPA Tier 1; Euro 2 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 145 kg |
The Porsche M 44.02 was used exclusively in Porsche's 986 Boxster platform with mid-engine, longitudinal mounting and no external licensing. This engine received minor running changes—revised flywheel design in 1998 and updated ECU maps—and was replaced in 1999 by the larger 2.7L M96 flat‑six variant. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from Porsche technical bulletins (1996–1998) and owner association failure logs (1999–2020). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The M 44.02 is mechanically simple and robust when maintained correctly, but early units (1996–1997) suffer from flywheel and timing guide wear. Later 1998 models include minor revisions. Regular oil changes, correct 10W-40 oil, and flywheel inspection during clutch work are essential for longevity.
Top issues include dual-mass flywheel cracking, Bosch Motronic sensor faults, valve cover oil leaks, and timing chain guide wear. These are well-documented in Porsche service bulletins. The inline-four layout is unusual for Porsche, so parts availability is narrower than for flat-six engines.
Exclusively the 1996–1998 Porsche Boxster (986) base model with 140 PS, sold only in Europe and select ROW markets—not offered in North America. It was replaced in 1999 by the 2.7L M96 flat-six.
Yes. Common upgrades include ECU remaps, performance cams, and free-flow exhaust, yielding 160–170 PS. However, the stock internals have modest limits—aggressive tuning risks head gasket or bearing wear. Most owners focus on drivability improvements rather than extreme power due to the engine’s entry-level role.
Approximately 10–12 L/100km (24–28 mpg UK) in mixed driving. Highway cruising can reach 8 L/100km (35 mpg UK), while aggressive use exceeds 14 L/100km due to the mid-engine layout and performance gearing.
Yes. The Porsche M 44.02 is an interference engine. If the timing chain fails or jumps, pistons will contact open valves, causing severe internal damage. Regular inspection of chain tensioners and guides is essential.
Porsche specifies 10W-40 synthetic oil meeting Porsche A40 standard. This viscosity ensures cam and bearing protection under high-RPM stress. Change intervals should not exceed 15,000 km or annually.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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