The Volkswagen B is a 1,588 cc, air‑cooled flat‑four petrol engine produced between 1974 and 1983. It featured a single overhead camshaft (SOHC) per cylinder bank and a twin‑choke downdraft carburettor. This iteration delivered approximately 55 kW (75 PS), providing adequate power for its era's compact vehicles.
Primarily fitted to the Volkswagen Type 4 (411/412) and later the Volkswagen Bus (T2, Bay Window '79 — '83), the B engine was engineered for dependable, econom…
Volkswagen
Production years 1974–1983 predate formal Euro emissions standards; compliance was governed by national regulations of the time records).
The Volkswagen B is a 1,588 cc air-cooled flat-four petrol engine engineered for compact sedans and vans (1974-1983). It combines a simple SOHC valvetrain with a twin-choke carburettor to deliver adequate low-to-mid range power. Designed for reliability and ease of service, it predates modern emissions mandates.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,588 cc | |
Fuel type | Petrol | |
Configuration | Flat-4, SOHC, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 94.0 mm × 71.0 mm | |
Power output | 55 kW (75 PS) @ 4,300 rpm | |
Torque | 127 Nm @ 3,000 rpm | |
Fuel system | Twin-choke downdraft carburettor (Solex 34 PICT-3) | |
Emissions standard | Pre-Euro (National Standards) | |
Compression ratio | 7.5:1 | |
Cooling system | Air-cooled (fan-forced) | |
Turbocharger | None | |
Timing system | Gear-driven camshafts | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 105 kg |
The Volkswagen B engine was used across Volkswagen's Type 4 platform with rear-engine, rear-wheel-drive mounting. This engine received minor carburettor and ignition updates throughout its production run. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
The B engine's primary reliability consideration is maintaining its air-cooling system. Volkswagen TPI notes that blocked cooling fins or failed oil cooler seals are common causes of elevated temperatures. Regular valve adjustments and using appropriate fuel for the valve seats are critical for long-term operation.
Analysis derived from Volkswagen technical bulletins (1970s-1980s) and owner club technical archives. 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 Volkswagen B engine is fundamentally robust due to its simple, gear-driven design. Long-term reliability depends heavily on maintaining the air-cooling system, performing regular valve adjustments, and addressing fuel compatibility if using unleaded petrol. With proper care, these engines can last for hundreds of thousands of kilometers.
The most frequent issues are overheating from blocked cooling fins, carburettor malfunctions, oil leaks from aged seals, and valve seat recession when run on unleaded fuel without hardened seats. These are well-documented in Volkswagen service literature and owner forums.
The B engine was primarily used in the final year of the Volkswagen Type 4 (411/412) in 1974. Its most common application was in the Volkswagen Transporter (T2, Bay Window) from 1979 until the end of air-cooled production in 1983 for most markets.
Yes, modest power gains are possible. Common upgrades include performance carburettors, extractor exhausts, and performance camshafts. Significant power increases require internal modifications and improved cooling. Tuning should be done carefully to avoid overheating the air-cooled engine.
Fuel economy is moderate for its era. Expect approximately 10-12 L/100km (24-28 mpg UK) in mixed driving for a Type 4, and slightly higher consumption (12-14 L/100km or 20-24 mpg UK) for a heavier Transporter van, depending on condition and driving style.
No. The Volkswagen air-cooled flat-four engine, including the B variant, is generally considered a non-interference design. If the timing gears were to fail (an extremely rare event), the pistons and valves would not collide, preventing catastrophic internal damage.
The original specification is SAE 10W-40 mineral oil. Modern multi-grade oils like 15W-40 or 20W-50 (mineral or semi-synthetic) that are compatible with older seals are commonly used and recommended by specialists for better high-temperature protection.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
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.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.