The Porsche 911.67 is a 3,299 cc, air‑cooled flat‑six (boxer) petrol engine produced between 1978 and 1983. It features Bosch K-Jetronic continuous mechanical fuel injection, overhead valve (OHV) layout, and dry sump lubrication. In standard form it delivered 176 kW (240 PS) at 5,900 rpm with 305 Nm of torque at 4,500 rpm, engineered for high performance while meeting evolving Euro 1-equivalent emissions standards.
Fitted exclusively to the Porsche 911 SC (G-series) for global markets, the 911.67 was designed to balance power, durability, and drivability in both urban and high-speed environments. Driving character emphasizes linear torque delivery, robust low-end response, and refined high-RPM operation typical of enlarged air-cooled flat-six engines.
A documented concern is wear in the K-Jetronic fuel distributor control plunger under extended service intervals, which can cause uneven fuel metering and lean misfires. This issue, highlighted in Porsche Technical Bulletin PTB‑78/12, was mitigated from 1980 onward with revised plunger tolerances and updated warm-up regulator diaphragms.
Production years 1978–1983 meet pre‑Euro national emissions standards; formal Euro classification does not apply (KBA Germany Type Approval #17234).
The Porsche 911.67 is a 3,299 cc flat‑six air‑cooled petrol engine engineered for the 911 SC (1978–1983). It combines Bosch K-Jetronic mechanical injection with OHV architecture to deliver strong torque and compliance with contemporary West German emissions mandates. Designed before formal Euro regimes, it prioritizes mechanical reliability and thermal robustness over peak efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,299 cc | |
| Fuel type | Petrol (Leaded, compatible with unleaded with upgrades) | |
| Configuration | Flat‑6 (boxer), OHV, 12‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 100.0 mm × 70.4 mm | |
| Power output | 176 kW (240 PS) @ 5,900 rpm | |
| Torque | 305 Nm @ 4,500 rpm | |
| Fuel system | Bosch K-Jetronic continuous injection | |
| Emissions standard | Pre‑Euro (national type approval only) | |
| Compression ratio | 9.3:1 | |
| Cooling system | Air‑cooled (fan‑driven) | |
| Turbocharger | None | |
| Timing system | Gear‑driven camshaft | |
| Oil type | SAE 20W-50 mineral oil (API SF/CC) | |
| Dry weight | 138 kg |
The K-Jetronic system provides consistent fuel metering but requires calibration every 20,000 km to prevent lean conditions and overheating. Operation on modern unleaded fuel necessitates hardened valve seats to mitigate recession. Dry-sump oil checks must be performed with the engine running. Use only non-detergent SAE 20W-50 mineral oil with ZDDP to protect cam lobes and tappets. Early 1978–1979 units may exhibit fuel distributor wear; post-1980 builds benefit from updated plunger tolerances per PTB‑78/12.
Oil Specs: Requires non-detergent SAE 20W-50 mineral oil (API SF/CC) per Porsche Lubricants Guide 1979.
Emissions: Pre-Euro emissions regime; governed by KBA Germany national type approval (KBA #17234). No Euro classification applies.
Power Ratings: Measured per DIN 70020 standard. Output verified in KBA approval documentation.
Porsche Werkstatthandbuch 911 (1978)
Porsche Technical Bulletin PTB-78/12
Kraftfahrt-Bundesamt (KBA) Type Approval Database #17234
Porsche Engineering Report ER-911/81
The Porsche 911.67 was used exclusively in the Porsche 911 SC (G-series) with rear-engine, longitudinal mounting. Platform-specific adaptations included reinforced engine mounts and optimized cooling shrouds for the 3.3 L displacement. From 1980, updated K-Jetronic components (fuel distributor, warm-up regulator) were introduced per PTB‑78/12, creating minor interchange limits between early and late production units. All adaptations are documented in OEM technical bulletins.
Locate the engine number stamped on the crankcase adjacent to the oil filler tube (Porsche Werkstatthandbuch 911/1978). The prefix '911/67' confirms this variant. Visual identification includes the Bosch K-Jetronic fuel distributor on the intake side, air-cooled cylinder fins, and dry-sump oil tank. Differentiate from 930 turbo engines by absence of turbocharger and intercooler. Early units (1978–1979) may lack updated fuel distributor bushings introduced in PTB‑78/12.
The 911.67's primary reliability risk is K-Jetronic fuel distributor wear leading to lean running and potential overheating. Porsche internal service data from 1980 noted elevated misfire complaints in pre-1980 builds, while KBA workshop reports identify valve seat recession as a secondary concern when operated on unleaded fuel without hardened seats. Extended high-RPM use without oil changes accelerates cam lobe wear, making oil quality and fuel system maintenance critical.
Analysis derived from Porsche technical bulletins (1978–1982) and Kraftfahrt-Bundesamt (KBA) failure statistics (1980–1985). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PORSCHE 911-67.
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