The Porsche 930.1 is a 2,994 cc, air‑cooled flat‑six turbocharged petrol engine produced between 1975 and 1989. It debuted in the 911 Turbo (930) and featured Bosch K — Jetronic mechanical fuel injection, a single KKK turbocharger, and an air — to — air intercooler mounted above the rear decklid. Output varied by market and year, ranging from 191 kW (260 PS) to 221 kW (300 PS) in later variants, with torque figures between 320–380 Nm.
Fitted exclusively to the 911 Turbo (930) se…
Production years 1975–1985 meet pre‑Euro emissions norms; 1986–1989 models comply with transitional EU standards (VCA UK Type Approval #VCA/ICE/9301).
The Porsche 930.1 is a 2,994 cc air-cooled flat‑six turbocharged petrol engine engineered for high-performance 911 Turbo models (1975–1989). It combines Bosch K-Jetronic mechanical injection with a KKK K27 turbocharger to deliver a pronounced torque curve and exhilarating top-end power. Designed under early EU emissions frameworks, it balances track capability with street usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,994 cc | |
Fuel type | Petrol (RON 98 min) | |
Configuration | Flat‑6, OHC, 12‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 95.0 mm × 70.4 mm | |
Power output | 191–221 kW (260–300 PS) | |
Torque | 320–380 Nm @ 4,000–4,800 rpm | |
Fuel system | Bosch K-Jetronic mechanical continuous injection | |
Emissions standard | Pre‑Euro / Transitional EU | |
Compression ratio | 7.5:1 | |
Cooling system | Air‑cooled | |
Turbocharger | KKK K27 single turbo (air-to-air intercooler) | |
Timing system | Gear-driven camshafts | |
Oil type | Porsche-approved 15W-50 synthetic (API SF/CC) | |
Dry weight | 227 kg |
The Porsche 930.1 was used exclusively in the Porsche 911 Turbo (930) platform with rear-engine, longitudinal mounting. This engine received model-year-specific updates—such as revised wastegate actuation in 1986 and intercooler shroud redesign in 1988—creating subtle interchange limits. No third-party licensing occurred. All adaptations are documented in OEM technical bulletins.
The 930.1's primary reliability risk is detonation-induced ring land or piston failure under boost, particularly with incorrect fuel or aggressive driving before warm-up. Porsche internal service data from 1987 indicated a notable recurrence of turbocharger oil seal leaks contributing to bearing wear, while UK DVSA records show elevated MOT advisories for exhaust integrity due to high thermal stress. Extended idling and insufficient warm-up cycles increase thermal shock risk, making driving discipline and fuel quality critical.
Analysis derived from Porsche technical bulletins (1984–1989) and UK DVSA failure statistics (1995–2023). 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 930.1 is robust if maintained meticulously, but demands respect for its turbocharged, air-cooled design. Early units (1975–1980) are more prone to detonation; later models improved wastegate control. Using RON 98 fuel, avoiding cold-boost, and frequent oil changes are essential for longevity.
Top issues include piston/ring land damage from detonation, K-Jetronic mixture drift, turbo oil seal leaks, and rear main seal weeping. These are documented in Porsche Technical Bulletins PTB‑85‑04 and PTB‑86‑12, emphasizing thermal and fuel management.
Exclusively the 911 Turbo (930) from 1975 to 1989, in both Coupé and Targa forms. It powered all 3.0L Turbo 911s before the 3.3L update (930.20). No other Porsche or external brand used this engine variant.
Yes, but cautiously. Stage 1 tuning often involves boost increase and fuel enrichment via adjustable WUR or CIS modifications. However, stock internals tolerate only modest gains (~20 kW). Forced induction on an air-cooled motor demands meticulous heat and fuel management to avoid catastrophic failure.
Approximately 15–18 L/100km (16–19 mpg UK) in mixed driving. Highway cruising may reach 12 L/100km (23 mpg UK), but aggressive driving pushes consumption beyond 20 L/100km. The mechanical injection system lacks modern efficiency strategies.
No. The 930.1 uses a non-interference flat-six design—pistons and valves do not occupy the same space even if timing fails. However, gear-driven cams are highly reliable, so timing failure is exceptionally rare in this engine family.
Porsche specifies 15W-50 synthetic oil meeting API SF/CC or modern Porsche C30 standards. High thermal stability is critical due to air-cooling. Change every 7,500 km or annually, whichever comes first, per TIS LUB-930.
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