The Volkswagen CU is a 1,588 cc, air‑cooled flat‑four petrol engine produced between 1975 and 1983. It features a single overhead camshaft (SOHC) per bank, pushrod‑actuated valves, and a Solex 34 PICT‑3 carburettor. In standard form it delivered 52 kW (70 PS) and 118 Nm of torque, prioritising simplicity and serviceability over performance.
Fitted primarily to the Type 2 T2b (Bay Window) and early Type 2 T3 (Vanagon) models, the CU was engineered for durability in commerc…
All production years 1975–1983 meet pre‑Euro (Euro 0) emissions standards; no formal VCA type approval applies to this era (Volkswagen internal emissions classification E‑75/83).
The Volkswagen CU is a 1,588 cc air‑cooled flat‑four petrol engine engineered for light commercial and passenger vans (1975–1983). It combines a single-barrel carburettor with robust pushrod valve actuation to deliver dependable low‑speed torque and straightforward field maintenance. Designed before formal EU emissions frameworks, it complies with national standards of its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,588 cc | |
Fuel type | Petrol (RON 91 min) | |
Configuration | Flat‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 93.0 mm × 58.0 mm | |
Power output | 52 kW (70 PS) @ 4,800 rpm | |
Torque | 118 Nm @ 2,800 rpm | |
Fuel system | Solex 34 PICT‑3 single‑barrel carburettor | |
Emissions standard | Pre‑Euro (Euro 0 equivalent) | |
Compression ratio | 7.3:1 | |
Cooling system | Air‑cooled with belt‑driven fan | |
Turbocharger | None | |
Timing system | Gear‑driven camshafts with pushrods | |
Oil type | SAE 20W‑50 mineral oil (API SF/CC) | |
Dry weight | 102 kg |
The Volkswagen CU was used across Volkswagen's Type 2 platforms with rear‑mounted longitudinal mounting and no licensing partnerships. This engine received platform-specific adaptations—reinforced engine mounts in the T2b and updated cooling shrouds in the early T3—and from 1979 the European T2b adopted an air injection pump for emissions, creating minor accessory interchange limits. No cross‑manufacturer usage was documented. All adaptations are documented in OEM technical bulletins.
The CU's primary reliability risk is carburettor icing and valve train wear due to its pushrod design, with elevated incidence in high‑humidity or neglected‑maintenance vehicles. Volkswagen field reports from 1978 noted frequent stalling complaints in Nordic and coastal regions, while internal durability testing showed valve seat recession after 120,000 km without clearance adjustments. Infrequent oil changes and use of low‑octane fuel accelerate ring wear and overheating, making adherence to service intervals critical.
Analysis derived from Volkswagen technical bulletins (1975–1983) and internal field service reports (1976–1984). 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 CU is mechanically simple and robust when maintained properly. Key concerns include carburettor icing and valve wear, but these are manageable with regular valve adjustments, correct oil changes, and use of RON 91+ fuel. Well-serviced examples often exceed 200,000 km without major rebuilds.
Most frequent issues are carburettor icing in cold/humid weather, burnt exhaust valves from infrequent clearance adjustments, oil sludge from extended service intervals, and generator bracket cracking. All are documented in Volkswagen service bulletins and addressed through routine maintenance.
The CU appears in the Type 2 T2b (Bay Window) from 1975–1979 and very early Type 2 T3 (Vanagon) base models from 1979–1983 as the 1600 variant. It was not used in Beetles or other passenger cars; it was specific to rear-engined vans.
Yes. Common upgrades include dual-carburettor manifolds, performance camshafts, and higher-compression pistons, yielding 80–90 PS. However, the stock 7.3:1 compression limits safe tuning without internal changes. Always retain adequate cooling and oil capacity.
Typical consumption is ~11.5 L/100km (city) and ~8.5 L/100km (highway), or about 25 mpg UK combined. Real-world mixed driving in a T2b usually returns 22–28 mpg (UK), depending on load, terrain, and condition.
No. The CU is a non-interference design. If the timing gears fail (extremely rare), the pistons will not contact the valves, preventing catastrophic damage. This enhances its reputation for field reliability.
Volkswagen specifies SAE 20W-50 mineral oil meeting API SF/CC standards. Synthetic oils are not recommended due to potential seal incompatibility in the air-cooled system. Change every 5,000 km or 6 months, whichever comes first.
Comprehensive technical documentation and regulatory references
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