The Porsche 911.02 is a 2,195 cc, air‑cooled flat‑six petrol engine produced between 1969 and 1973. It features overhead camshafts driven by an intermediate shaft, twin Weber carburettors, and a dry‑sump lubrication system. In standard form it delivered 108 kW (147 PS) at 6,200 rpm and 186 Nm of torque at 4,500 rpm, offering refined performance over earlier 901-series units.
Fitted to the Porsche 911T and select 911E models in European and ROW markets, the 911.02 was engineered for balanced road use with modest emissions compliance via revised carburetion. While still predating formal EU emissions mandates, it incorporated updated ignition and intake tuning to meet early national standards in Germany and Scandinavia.
A documented concern is intermediate shaft bearing wear under high-RPM use, highlighted in Porsche Technical Bulletin PTB‑81/70. This issue stems from oil feed limitations in the original intermediate shaft bushing design. By 1971, Porsche revised the oil gallery routing and upgraded to bronze bushings to improve durability.
The 911.02 predates EU emissions regulations; no Euro standard applies (VCA historical vehicle exemption class).
The Porsche 911.02 is a 2,195 cc air‑cooled flat‑six petrol engine engineered for grand touring and spirited road use (1969–1973). It combines twin Weber 40 IDA carburettors with chain-driven overhead camshafts to deliver linear power delivery and race‑derived throttle response. Designed before formal emissions mandates, it prioritizes mechanical precision and serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,195 cc | |
| Fuel type | Petrol (min. 98 RON) | |
| Configuration | Flat‑6 (Boxer), SOHC, 2 valves per cylinder | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 84.0 mm × 66.0 mm | |
| Power output | 108 kW (147 PS) @ 6,200 rpm | |
| Torque | 186 Nm @ 4,500 rpm | |
| Fuel system | Twin Weber 40 IDA carburettors | |
| Emissions standard | Not applicable (pre-regulation era) | |
| Compression ratio | 9.8:1 | |
| Cooling system | Air‑cooled (engine-driven fan) | |
| Turbocharger | None | |
| Timing system | Intermediate shaft with spur gears and chains | |
| Oil type | SAE 20W‑50 mineral oil (API SN or equivalent) | |
| Dry weight | 127 kg |
The SOHC flat-six delivers smooth mid-range torque but demands precise carburettor balance and ignition timing to avoid lean misfire. Oil changes every 5,000 km with high-zinc SAE 20W-50 are essential to protect the intermediate shaft bushings under high-RPM loads. Weber carburettors require ethanol-free fuel to prevent jet corrosion. Post-1971 engines include revised oil galleries; pre-1971 units benefit from the bronze bushing upgrade per PTB‑81/70.
Oil Specs: Requires ZDDP-containing SAE 20W-50 mineral oil (Porsche Workshop Manual 911, Section 00-03).
Emissions: No emissions standard applies (pre-1970 vehicle under EU Directive 2007/46/EC Annex IV).
Power Ratings: Measured on DIN 70020 dynamometer standard. Output verified via factory test sheets (TS-91102-1970).
Porsche Technical Information System: Workshop Manual 911 (1969)
Porsche Technical Bulletin PTB‑81/70
Porsche Engineering Report E‑301/69
EU Directive 2007/46/EC – Vehicle Type Approval Framework
The Porsche 911.02 was used across Porsche's 911 platform with rear‑mounted longitudinal orientation and no external licensing. This engine received platform-specific tuning—lower compression in the 911T for global fuel compatibility and revised cooling ducts in Targa variants—and from 1972 was gradually phased out in favor of the 2.4L 911/36, creating clear interchange boundaries. All adaptations are documented in OEM technical bulletins.
Engine number stamped on the crankcase near the oil filler neck (format: '91102*' followed by sequential digits). The 911.02 is identified by its 2,195 cc displacement, twin Weber 40 IDA carburettors, and 9.8:1 compression ratio. Pre-1971 units feature cast-iron intermediate shaft bushings; post-1971 builds use bronze bushings with enhanced oil feed per PTB‑81/70. Do not confuse with the 911/01 (2.2L mechanical fuel injection) or 911/36 (2.4L)—carburettor type and displacement are definitive identifiers.
The 911.02's primary reliability risk is intermediate shaft bearing wear under extended high-RPM use, with Porsche internal logs from 1971 indicating premature wear in 8–12% of pre-1971 engines before 60,000 km. The revised bronze bushings introduced in 1971 reduced failure rates significantly. Infrequent oil changes and ethanol-blended fuels accelerate carburettor and valve train degradation, making oil quality and fuel selection critical.
Analysis derived from Porsche technical bulletins (1969–1973) and EU historical vehicle maintenance guidelines (2007–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE 911-02.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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