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) f…
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 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.
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.
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With proper K-Jetronic maintenance and valve seat upgrades for unleaded fuel, the 911.67 is robust. Early engines (1978–1979) may require fuel system attention. Regular oil changes and valve adjustments every 10,000 km are essential for longevity.
Top issues include K-Jetronic distributor wear, valve seat recession on unleaded fuel, cam/tappet wear, and oil leaks from aged seals. These are documented in Porsche Technical Bulletins PTB-78/12 and service manuals.
Exclusively the Porsche 911 SC (G-series) coupé, Targa, and Cabriolet from 1978 to 1983. These were the only 3.3 L naturally aspirated 911s before the 3.2 Carrera. All are rear-engine, RWD layouts with 4- or 5-speed manual transmissions.
Yes. Common upgrades include performance cams, higher-compression pistons (up to 10.0:1), and K-Jetronic recalibration. Period-correct builds stay under 260 PS to preserve air-cooled thermal limits. Forced induction is not factory-supported.
Typical consumption is 14–16 L/100km (20–18 mpg UK) in mixed driving due to larger displacement. Highway cruising yields ~11.5 L/100km (25 mpg UK). Short-trip driving significantly worsens economy due to thermal inefficiency in air-cooled design.
No. The 911.67 is a non-interference OHV flat-six. If timing fails (unlikely, as it uses gears), valves and pistons do not contact. However, valve train damage can still occur from loose components or excessive clearance.
Porsche specifies SAE 20W-50 mineral oil with API SF/CC rating and ZDDP anti-wear additive (≥1000 ppm). Modern synthetics may cause oil pump cavitation in dry-sump systems. Change every 10,000 km or annually, whichever comes first.
Comprehensive technical documentation and regulatory references
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