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 (VCA UK Type Approval #VCA/EMS/0022).
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.
The EX engine's primary reliability risk is camshaft lobe wear in early builds, with elevated incidence in vehicles used for sustained high‑load operation or with extended oil change intervals. Volkswagen internal service data from 1977 indicated a measurable increase in cam/tappet replacements before 80,000 km in affected batches, while UK DVSA historical records show low mechanical failure rates when properly maintained. Oil quality and change frequency make cam longevity critical.
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.
Yes. Common upgrades include dual-carburettor manifolds, performance camshafts, and cylinder head porting. Stage 1 builds typically reach 90–100 PS. However, increased output demands improved cooling and oiling. Forced induction is rare due to case strength limits.
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
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with VOLKSWAGEN or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
VOLKSWAGEN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialVOLKSWAGEN documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.