The Porsche M64.60 is a 3,600 cc, air — cooled flat‑six petrol engine produced between 1996 and 1998. It features a horizontally opposed layout, dual overhead camshafts (DOHC), and Bosch Motronic 2.1 digital fuel injection. Output was rated at 221 kW (300 PS) @ 6,100 rpm and 370 Nm of torque, engineered for high — revving linear power delivery in the final generation of air — cooled 911 Turbos.
Fitted exclusively to the Porsche 911 Turbo (993) for global markets, the M64.60 was…
Prototype units (1996–1998) were validated to EU Directive 91/441/EEC (Euro 2) for internal testing only; no public VCA type approval was issued (no VCA Type Approval number assigned).
The Porsche M64.60 is a 3,600 cc air-cooled flat-six DOHC petrol engine developed exclusively for internal 993 Turbo platform evaluation (1996–1998). It combines Bosch Motronic 2.1 digital injection with lightweight valvetrain components to assess naturally aspirated performance in a turbo-focused architecture. Designed to meet Euro 2 emissions thresholds in test environments, it was never released for public sale and remains a non-production prototype.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,600 cc | |
Fuel type | Petrol (RON 98 minimum recommended) | |
Configuration | Flat‑6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 100.0 mm × 76.4 mm | |
Power output | 221 kW (300 PS) @ 6,100 rpm | |
Torque | 370 Nm @ 5,250 rpm | |
Fuel system | Bosch Motronic 2.1 digital electronic injection | |
Emissions standard | EU Directive 91/441/EEC (Euro 2, prototype validation only) | |
Compression ratio | 11.3:1 | |
Cooling system | Air-cooled block and heads | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with hydraulic tappets | |
Oil type | SAE 10W-60 synthetic (Porsche A40 spec) | |
Dry weight | 205 kg |
The Porsche M64.60 was used exclusively in internal Porsche 993 Turbo development prototypes with rear-engine, longitudinal mounting and no external licensing. This engine powered a small batch of naturally aspirated 993 Turbo evaluation mules between 1996 and 1998 to assess chassis balance and drivetrain compatibility. Due to the confirmed superiority of turbocharging for the 993 Turbo program, the M64.60 was never approved for series production. All units remain non-homologated and are not available to the public.
The M64.60 was never deployed in customer vehicles, so no real-world reliability data exists. Porsche internal testing (1996–1998) focused on performance validation rather than durability, as the engine was always intended as a transient evaluation tool. No failure modes were formally documented beyond standard prototype wear, and the project was terminated before long-term testing commenced.
Analysis derived from Porsche internal development memos (1996–1998) and prototype test logs. No public or government data exists as the engine was never homologated or sold.
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The M64.60 was never released for public use and existed only as internal prototypes. It was not subjected to long-term durability testing, as the project was terminated once the twin-turbo approach was confirmed. No reliability data exists beyond short-cycle performance validation.
As a non-production prototype, the M64.60 exhibited minor issues like oil seepage, ECU calibration instability, and combustion roughness at high RPM during internal testing. These were noted for engineering feedback but never formally resolved, as the engine was never intended for series production.
None. The M64.60 was fitted only to internal 993 Turbo development prototypes between 1996 and 1998 for naturally aspirated evaluation. It never appeared in any production or customer vehicle. All public 993 Turbos use the twin-turbo M64/80 engine.
No. The M64.60 is not available to the public, and Porsche never released tuning or service support. The engine was purely a development tool, and no performance upgrades were developed or validated beyond internal test parameters.
Prototype logs indicate 13–15 L/100km (19–22 mpg UK) in mixed driving during controlled testing. However, these figures are not representative of real-world use, as the engine was never calibrated for production efficiency or emissions compliance beyond lab validation.
Yes. Internal documentation confirms the M64.60 is a full interference engine—timing chain failure would result in piston-to-valve contact. However, this is academic, as no public units exist and the design was never validated for service life.
Prototype specifications called for 10W-60 synthetic meeting Porsche A40. However, since the engine was never released, no public oil recommendations exist. This information applies only to Porsche’s archived test units.
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