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 .
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 | Refer to vehicle handbook / manufacturer specification | |
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.
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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 manufacturer technical service bulletins and industry workshop records. 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.
Aftermarket ECU tuning is common on the M-44-04 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
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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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
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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