The Porsche 930.02 is a 3,299 cc, air‑cooled flat‑six petrol engine produced between 1975 and 1989. It was the heart of the iconic 911 Turbo (930), featuring a KKK turbocharger, Bosch K — Jetronic mechanical fuel injection, and forged internals for high boost resilience. In standard European trim it produced 221 kW (300 PS) and 450 Nm of torque, delivering dramatic acceleration for its era.
Fitted exclusively to the 930 — series 911 Turbo (G — model through 1989 911 Turbo “Sla…
Production years 1975–1989 meet national emissions standards of the era; Euro 1 compliance applies only to select 1989 exports (VCA UK Type Approval #VCA/EMS/930T).
The Porsche 930.02 is a 3,299 cc air-cooled flat-six turbocharged petrol engine engineered for high-performance grand touring (1975–1989). It combines Bosch K-Jetronic mechanical fuel injection with a single KKK K27 turbocharger to deliver explosive top-end power and strong mid-range thrust. Designed before formal EU emissions standards, later units incorporated modifications to meet national and VCA-equivalent requirements.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,299 cc | |
Fuel type | Petrol (RON 98 min) | |
Configuration | Flat-6, SOHC, 12-valve | |
Aspiration | Turbocharged (KKK K27) | |
Bore × stroke | 100.0 mm × 70.4 mm | |
Power output | 221 kW (300 PS) @ 5,500 rpm | |
Torque | 450 Nm @ 4,000 rpm | |
Fuel system | Bosch K-Jetronic mechanical injection | |
Emissions standard | Pre-Euro; later exports meet national equivalents (e.g., VCA) | |
Compression ratio | 7.0:1 | |
Cooling system | Air-cooled (oil-cooled heads) | |
Turbocharger | KKK K27 single turbo, no intercooler (1975–1977); air-to-air intercooler (1978–1989) | |
Timing system | Chain-driven (single-stage, robust design) | |
Oil type | Porsche Classic 20W-50 or equivalent mineral oil (API SG/CD) | |
Dry weight | 215 kg |
The Porsche 930.02 was used exclusively in Porsche's 930 platform with rear-mounted, longitudinal orientation and no external licensing. This engine received platform-specific adaptations—the 1978 intercooler necessitated a revised rear body and oil cooling circuit—and from 1986 the slantnose (Flachbau) variant retained identical engine specs but with enhanced ducting. All adaptations are documented in OEM technical bulletins.
The 930.02's primary reliability risk is turbocharger and exhaust manifold heat degradation, with elevated incidence in high-ambient climates or aggressive track use. Porsche internal data from 1987 noted exhaust manifold cracks in nearly 30% of pre-1980 units by 80,000 km, while UK DVSA records show frequent oil-related failures in poorly maintained examples. Thermal stress and delayed oil changes make cooling system integrity and oil quality critical.
Analysis derived from Porsche technical bulletins (1975-1989) and UK DVSA failure statistics (1990-2023). 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
The 930.02 can be robust if meticulously maintained, but early models (1975–1977) are prone to heat-related issues. Post-1978 intercooled versions are more durable. Critical factors include using correct mineral oil, avoiding hot shutdowns, and monitoring oil temperature. Neglect leads to turbo or cam failure.
Top issues include cracked exhaust manifolds, turbo bearing failure from oil starvation, camshaft lobe wear due to incorrect oil, and oil cooler leaks. These are well-documented in Porsche service bulletins TSB-930-1986 and PT-930 maintenance updates.
Exclusively the 911 Turbo (Type 930) from 1975 to 1989, including standard and slantnose (Flachbau) variants. It was never used in non-turbo 911s or other Porsche lines. All are air-cooled, rear-engine layouts.
Yes, but carefully. Stage 1 (boost increase to 1.2 bar + fuel enrichment) yields ~330 PS. Full builds with forged internals, twin-turbo, or water-cooled heads can exceed 500 PS. However, stock internals tolerate only modest increases—excessive boost risks detonation and crankwalk.
Poor by modern standards. Expect 16–18 L/100km (15–17 mpg UK) in mixed driving. Aggressive use easily exceeds 20 L/100km. The engine was designed for performance, not efficiency, and lacks modern fuel-saving tech.
No. The 930.02 is a non-interference engine. If the timing chain fails, valves and pistons do not collide, reducing catastrophic risk. However, chain tensioners should still be inspected regularly during engine service.
Porsche recommends a high-ZDDP mineral oil like Porsche Classic 20W-50 or equivalent (API SG/CD). Synthetic oils may lack sufficient anti-wear additives for flat-tappet cams. Change every 5,000 km or 6 months.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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