The Porsche M 44.04 is a 2,480 cc, water‑cooled inline‑four petrol engine produced between 1996 and 1998. It featured Bosch Motronic 5.2 electronic fuel injection, dual overhead camshafts (DOHC), and a 16‑valve layout. In the 968 Club Sport and 968 Cabriolet it delivered 143 kW (194 PS) and 245 Nm of torque.
Fitted exclusively to the final iteration of the Porsche 968, the M 44.04 was engineered for refined performance and improved emissions compliance over its predecesso…
Production years 1996–1998 meet Euro 2 emissions standards under EU Directive 94/12/EC (VCA UK Type Approval #VCA/EMS/9684).
The Porsche M 44.04 is a 2,480 cc inline‑four petrol engine engineered for the Porsche 968 (1996–1998). It combines Bosch Motronic 5.2 engine management with DOHC architecture to deliver linear power delivery and compliance with Euro 2 emissions. Designed as the final evolution of Porsche’s transaxle four-cylinder line, it prioritizes drivability and emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,480 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 95.0 mm × 87.3 mm | |
Power output | 143 kW (194 PS) | |
Torque | 245 Nm @ 4,100 rpm | |
Fuel system | Bosch Motronic 5.2 electronic fuel injection | |
Emissions standard | Euro 2 | |
Compression ratio | 10.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with hydraulic tensioner | |
Oil type | Porsche Longlife 10W‑60 or 10W‑40 (ACEA A3/B3) | |
Dry weight | 142 kg |
The Porsche M 44.04 was used exclusively in Porsche's 968 platform with front-engine, rear-transaxle longitudinal mounting and no external licensing. This engine received minor ECU calibration updates over its production run—optimized idle control in 1997 Cabriolets—but shares core architecture across all variants. All adaptations are documented in OEM technical bulletins.
The M 44.04's primary reliability risk is hydraulic timing chain tensioner wear, with elevated incidence in high-mileage examples exceeding 100,000 km. Porsche field data from 1998 indicated over 15 % of engines required timing system inspection before 120,000 km, while UK DVSA MOT records correlate neglected lambda sensor replacement with catalyst failure. Extended oil change intervals accelerate tensioner seal degradation, making oil quality and service adherence critical.
Analysis derived from Porsche technical bulletins (1996–1998) and UK DVSA failure statistics (1998–2023). 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 44.04 offers refined performance but requires vigilant maintenance. The hydraulic timing tensioner is its main weakness—inspect after 100,000 km. Using correct ACEA A3/B3 oil and replacing lambda sensors at 80,000 km ensures longevity. Well-maintained examples can exceed 200,000 km without major issues.
Top issues include hydraulic timing tensioner wear, lambda sensor degradation, cam cover oil leaks, and front coolant pipe corrosion. All are documented in Porsche service bulletins (e.g., 968/02/97) and UK MOT data. The interference design means timing issues can cause catastrophic failure if ignored.
Exclusively the European-spec Porsche 968 (1996–1998) in Club Sport, Coupé, and Cabriolet forms. It replaced the M 44.01 and was never used in the 944 or Boxster. No external brands licensed this engine. All feature front-engine, rear-transaxle layout.
Yes—common upgrades include high-flow intake, performance exhaust, and ECU remap. Stage 1 typically yields 210–220 PS. However, the stock internals limit safe output; going beyond 240 PS risks rod bearing wear. Forced induction is possible but requires internal reinforcement and custom engine management.
Approximately 12.8 L/100km (city) and 8.4 L/100km (highway), or ~28 mpg UK combined. Aggressive driving can exceed 15 L/100km. The Bosch Motronic system is efficient for its era but less so than modern direct injection.
Yes. The M 44.04 is an interference engine—pistons and valves occupy the same space if timing fails. A worn tensioner or broken chain can cause severe internal damage. Immediate attention to timing rattle is essential to prevent engine destruction.
Porsche specifies 10W‑40 or 10W‑60 oil meeting ACEA A3/B3 standards (e.g., Porsche Classic 10W-40). Modern low-SAPS or C3 oils are not recommended. Change oil every 10,000 km to protect the hydraulic tensioner and valvetrain.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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