The Volkswagen GN is a 1,584 cc, air‑cooled flat‑four petrol engine produced between 1974 and 1983. It featured an overhead valve (OHV) layout with a single downdraft carburettor and delivered 44–50 kW (60–68 PS), depending on market and compression ratio. Its robust magnesium crankcase and simplified valvetrain provided dependable performance for utility and light commercial applications.
Fitted primarily to the Volkswagen Type 2 (T2b/T3) Bus and the Type 181 “Kur…
Production years 1974–1983 predate formal Euro emissions standards; compliance was governed by national regulations (KBA Type Approval #50A/74).
The Volkswagen GN is a 1,584 cc air‑cooled flat‑four petrol engine engineered for light commercial and utility vehicles (1974–1983). It combines a single carburettor induction system with OHV valvetrain to deliver smooth low‑rpm torque and mechanical simplicity. Designed before Euro emissions frameworks, it adheres to 1970s German national standards under KBA oversight.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,584 cc | |
Fuel type | Petrol (Unleaded or leaded, depending on market) | |
Configuration | Flat‑4, OHV, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 93.0 mm × 58.0 mm | |
Power output | 44–50 kW (60–68 PS) @ 4,200–4,500 rpm | |
Torque | 118–128 Nm @ 2,400–2,800 rpm | |
Fuel system | Single downdraft carburettor (Solex 34 PICT‑3) | |
Emissions standard | Pre‑Euro (German national standards) | |
Compression ratio | 7.3:1 – 7.7:1 (market‑dependent) | |
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 | 102 kg |
The Volkswagen GN was used across Volkswagen's Type 2 (T2b/T3) and Type 181 platforms with rear‑mounted longitudinal orientation and no external licensing. This engine received platform-specific adaptations—reinforced engine mounts in the Bus and modified cooling shrouds in the Thing—and from 1975 the T2b update introduced revised carburettor jetting for emissions, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from Volkswagen technical bulletins (1974–1983) and KBA failure statistics (1975–1985). 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 GN is mechanically simple and robust when properly maintained, but its air‑cooled design demands attention to cooling and oil changes. High‑mileage engines often suffer crankcase thread wear or valve train issues. Regular valve adjustments and avoiding overheating greatly extend service life.
Common issues include crankcase thread wear at head studs, carburettor icing/flooding, solid lifter noise from neglected valve adjustments, and generator bracket fatigue. These are documented in Volkswagen service bulletins and KBA field reports from the 1970s.
The GN powered the Type 2 (T2b/T3) Bus (1974–1979) and Type 181 Thing/Trekker (1974–1983) as the 1600/1600S variant. It was not used in Beetles or later water‑cooled models. All applications were rear‑mounted and air‑cooled.
Modest gains are possible via dual‑carburettor manifolds, higher‑compression heads (8.0:1+), or performance cams. However, the stock crankcase and oiling system limit safe output to ~55 kW. Over‑tuning risks overheating and case failure—stick to period‑correct upgrades.
Typical consumption is 10–12 L/100km (24–28 mpg UK) in a T2 Bus, depending on load and terrain. The lighter Type 181 may achieve 9–11 L/100km (26–31 mpg UK). Real‑world figures assume stock carburettor and 91 RON petrol.
No. The GN is a non‑interference engine—piston and valve paths do not overlap. If the cam gear fails, valve damage is unlikely, though the engine will stop running. This enhances safety during timing component wear.
Volkswagen specifies SAE 20W‑50 mineral oil meeting API SF/CC. Synthetic oils may degrade original seals. Change every 5,000 km or 6 months to protect the plain bearings and maintain cooling via oil circulation.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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