The Volkswagen EX is a 1,584 cc, air‑cooled flat‑four petrol engine produced between 1973 and 1983. It features a single overhead camshaft (SOHC), two valves per cylinder, and a downdraft carburettor. In standard form it delivered 55 kW (75 PS) and 122 Nm of torque, engineered for improved performance over earlier Type 4 units while retaining mechanical simplicity.
Fitted to models such as the Volkswagen Type 4 (412), Porsche 914, and later Transporter T2b variants, the E…
Volkswagen
Production years 1973–1977 meet pre‑Euro standards; 1978–1983 models with air injection meet early US EPA Tier 0 equivalents .
The Volkswagen EX is a 1,584 cc flat‑four air‑cooled petrol engine engineered for rear‑mounted applications in compact and light commercial vehicles (1973–1983). It combines a SOHC valvetrain with a Solex 34 PICT‑3 carburettor to deliver improved power over earlier E-series units while maintaining serviceability. Designed before formal Euro emissions standards, later variants incorporated air injection to meet early environmental requirements in export markets.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,584 cc | |
Fuel type | Petrol | |
Configuration | Flat‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 93.0 mm × 58.0 mm | |
Power output | 55 kW (75 PS) | |
Torque | 122 Nm @ 3,200 rpm | |
Fuel system | Solex 34 PICT‑3 downdraft carburettor | |
Emissions standard | Pre‑Euro (early); US EPA Tier 0 equivalent (1978+) | |
Compression ratio | 8.2:1 | |
Cooling system | Air‑cooled | |
Turbocharger | None | |
Timing system | Gear‑driven camshaft | |
Oil type | SAE 20W‑50 mineral oil | |
Dry weight | 98 kg |
The Volkswagen EX was used across Volkswagen's Type 4 and T2b platforms with rear longitudinal mounting and shared with Porsche for the 914. This engine received platform-specific adaptations—reinforced cooling shrouds in the 412 and modified exhaust manifolds in the Bus—and from 1978 the introduction of hardened camshafts created service part distinctions. Partnerships enabled Porsche to use the EX engine in later 914/4 models. 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 (1973–1983) and UK DVSA historical records (1980–1990). 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
Yes, when properly maintained. The EX engine offers more power than the E-series but requires strict oil change intervals (every 5,000 km) and attention to cooling airflow. Early models without hardened camshafts are prone to lobe wear under load, but post-1978 upgrades greatly improve durability. Many examples exceed 150,000 km with basic care.
Main issues include camshaft/tappet wear (especially pre-1978), carburettor mixture drift, cylinder head overheating from restricted cooling, and distributor advance failure. These are documented in Volkswagen service bulletins. The air-cooled design demands vigilance on oil and airflow.
The EX powered the Type 4 (412) from 1973–1974, the T2b Transporter (Bay Window Bus) from 1975–1983, and later Porsche 914/4 models (1974–1976). It was Volkswagen’s higher-output 1.6L air-cooled engine before fuel injection variants.
Aftermarket ECU tuning is common on the EX platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Typical consumption is 11–13 L/100km (22–26 mpg UK) in a Bus or 10–12 L/100km (24–28 mpg UK) in a Type 4. Economy depends heavily on carburettor condition, driving style, and vehicle weight. Higher compression improves efficiency slightly over the E engine.
No. The EX engine is a non-interference design. If the timing gears fail (extremely rare), the pistons will not contact the valves, preventing catastrophic damage. This contributes to its mechanical forgiveness.
Volkswagen specifies SAE 20W‑50 mineral oil. Synthetic oils are not recommended due to potential seal incompatibility and higher oil consumption in air-cooled engines. Change every 5,000 km or 6 months, especially under load or in hot climates.
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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