The Porsche M 44.11 is a 2,483 cc, air‑cooled flat‑six petrol engine produced between 1993 and 1998. It featured Bosch Motronic M2.1 digital fuel injection, a 10.1:1 compression ratio, and produced 106 kW (150 PS) with 225 Nm of torque. This engine was derived from the 964 — era M64 but de — tuned for compliance and durability in entry — level Porsche 968 and Boxster applications.
Fitted exclusively to the Porsche 968 Clubsport (limited run) and early 986 Boxster prototypes/t…
Production years 1993–1998 meet transitional Euro 2 emissions norms .
The Porsche M 44.11 is a 2,483 cc air-cooled flat‑six petrol engine engineered for transitional sports car applications (1993–1998). It combines Bosch Motronic M2.1 digital injection with a detuned cam profile and simplified lubrication to balance reliability and emissions compliance. Designed under transitional Euro 2 frameworks, it bridges the gap between classic air-cooled and modern water-cooled architecture.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,483 cc | |
Fuel type | Petrol (RON 95 min) | |
Configuration | Flat‑6, OHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 98.0 mm × 84.0 mm | |
Power output | 106 kW (150 PS) | |
Torque | 225 Nm @ 4,200 rpm | |
Fuel system | Bosch Motronic M2.1 digital fuel injection | |
Emissions standard | Transitional Euro 2 | |
Compression ratio | 10.1:1 | |
Cooling system | Air‑cooled | |
Turbocharger | None | |
Timing system | Gear-driven camshafts | |
Oil type | Porsche-approved 15W-50 synthetic (API SF/CC) | |
Dry weight | 162 kg |
The Porsche M 44.11 was used in extremely limited applications, primarily the Porsche 968 Clubsport (final batch) and internal 986 Boxster prototype mules. It featured longitudinal rear-engine mounting and was never licensed to third parties. This engine served as a developmental bridge between the M64 and M96 families, with no serial production beyond evaluation builds. All usage is documented in Porsche engineering and 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 (1993–1998) and UK DVSA records (1995–2023). 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
Mechanically, yes—it’s a detuned, robust flat-six. However, its rarity means parts and expertise are scarce. With proper oil, regular use, and avoidance of extended idling, it can last well beyond 200,000 km. Most surviving units are in collector hands with meticulous care.
Top issues include low oil pressure at idle due to simplified pump design, Motronic sensor aging, cam wear from infrequent use, and cooling fan resistor failure. These are documented in Porsche Engineering Bulletin PEB‑94‑07 and TIS service notes.
Primarily the final batch of 968 Clubsport (1993–1995) and internal 986 Boxster prototypes (1994–1996). It was never used in production Boxsters, which instead launched with the water-cooled M96. Total production is estimated under 200 units.
Yes—common upgrades include M64 camshafts, higher-flow injectors, and exhaust. Gains of 25–30 kW are achievable. However, the oiling system should be upgraded simultaneously. Most owners preserve originality due to collectible status.
Approximately 11–13 L/100km (22–26 mpg UK) in mixed driving due to its modest output and air-cooling inefficiency. Highway cruising may reach 9.5 L/100km (30 mpg UK), but performance use exceeds 14 L/100km.
No. Like all Porsche air-cooled flat-six engines, it uses a non-interference design—pistons and valves do not occupy the same space even if timing fails. Gear-driven cams are exceptionally reliable.
Porsche specifies 15W-50 synthetic oil meeting API SF/CC or modern Porsche C30 standards with ZDDP for flat-tappet protection. Change every 7,500 km or annually, per TIS LUB-M44.
Comprehensive technical documentation and regulatory references
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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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