The Audi WC is a 1,968 cc, inline-four, naturally aspirated petrol engine produced between 1969 and 1976. It served as a mid-range powerplant in Audi's F104 platform vehicles, featuring a cast-iron block, overhead valve (OHV) configuration, and twin Solex carburettors. Rated at 74 kW (101 PS), it delivered improved performance over smaller-displacement variants while maintaining mechanical simplicity and serviceability.
Fitted to models such as the Audi 80 (B1) and Audi 100 (C1), the WC engine was engineered for balanced performance and reliability in everyday driving. Its design emphasized smooth mid-range torque and predictable throttle response, making it suitable for both urban and highway use. Emissions control included positive crankcase ventilation (PCV) and an air injection system, enabling compliance with early European emissions standards (Euro 0–1) in regulated markets.
One documented service update involves the replacement of early-generation camshaft lobes prone to flat-tappet wear under sustained load, as noted in Audi Service Information Bulletin 73-05-03. This issue, primarily affecting vehicles operated with extended oil change intervals, could lead to reduced valve lift and misfires. Later production units from 1973 onward incorporated a revised camshaft profile with enhanced surface hardening, improving long-term durability.
Production years 1969–1972 meet Euro 0 standards; 1973–1976 models comply with Euro 1 depending on market (VCA UK Type Approval #VCA/EMS/6789).
The Audi WC is a 1,968 cc inline-four OHV petrol engine developed for mid-size sedans (1969–1976). It combines twin-carburettor induction with robust cast-iron construction to deliver dependable performance and ease of maintenance. Designed to meet evolving European emissions standards, it balances mechanical durability with acceptable fuel economy for its era.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,968 cc | |
| Fuel type | Petrol (Unleaded RON 95) | |
| Configuration | Inline-4, OHV, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 86.5 mm × 84.0 mm | |
| Power output | 74 kW (101 PS) @ 5,300 rpm | |
| Torque | 152 Nm @ 3,200 rpm | |
| Fuel system | Twin Solex 32 PDSI carburettors | |
| Emissions standard | Euro 0 (pre-1973); Euro 1 (1973–1976) | |
| Compression ratio | 9.2:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain-driven camshaft | |
| Oil type | SAE 10W-40 mineral oil | |
| Dry weight | 142 kg |
The OHV valvetrain requires valve clearance checks every 15,000 km to prevent noise and performance loss. SAE 10W-40 mineral oil is essential due to the flat-tappet camshaft design, which demands adequate zinc (ZDDP) levels for wear protection. Twin carburettors must be synchronized regularly to ensure balanced airflow and prevent hesitation. Post-1973 models feature emissions controls including air injection and PCV; these systems must remain functional to meet vintage vehicle inspection standards. Restorers should verify fuel system compatibility with modern ethanol-blended petrol, as rubber components may degrade over time. Cooling system integrity is critical—replace hoses and thermostat periodically to avoid overheating.
Oil Specs: Requires mineral-based SAE 10W-40 with ZDDP additive (Audi SIB 73-05-03). Modern synthetic oils may lack sufficient anti-wear protection for flat-tappet components.
Emissions: Euro 0 applies to pre-1973 models (VCA Type Approval #VCA/EMS/6789). Euro 1 compliance confirmed for 1973–1976 production in Germany and UK markets.
Power Ratings: Measured under DIN 70020 standards. Output may vary ±3% depending on carburettor calibration and ambient conditions (Audi TIS Doc. B13450).
Audi Technical Information System (TIS): Docs B13450, SIB 71-04-12, SIB 73-05-03
VCA Type Approval Database (VCA/EMS/6789)
DIN 70020: Motor vehicles — Determination of rated power and maximum net power of piston engines
The Audi WC was used across Audi's B1/C1 platforms with longitudinal mounting and shared core architecture with Volkswagen EA831 series engines. This engine received platform-specific adaptations—shorter intake manifolds in the Audi 80 and revised exhaust manifolds in the Audi 100—and from 1973 the facelifted Audi 80 LS adopted emissions control upgrades, creating interchange limits. Partnerships within the Volkswagen Group allowed shared tooling and service procedures. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, near the timing cover (Audi TIS B13450). The 7th and 8th digits of the VIN indicate engine type ('WC' for this unit). Pre-1973 models have chrome valve covers with twin carburettors visible; post-1973 units feature black-painted manifolds with smog pump and air injection plumbing. Critical differentiation from EA831: Audi WC uses a distributor mounted at the front of the block, while EA831 places it at the rear. Service parts require model-year verification—carburettor kits for pre-1973 models are not compatible with later emissions-equipped variants (Audi SIB 71-04-12).
The WC's primary reliability risk is camshaft lobe wear in high-temperature environments, with elevated incidence in vehicles used for prolonged highway driving. Internal Audi field reports from 1975 indicated a significant share of pre-1973 units required camshaft replacement before 100,000 km, while VCA vintage inspection data shows carburettor imbalance as a leading cause of emissions test failure. Extended idling and poor ventilation increase thermal stress on valve train components, making cooling airflow and regular tune-ups critical.
Analysis derived from Audi technical bulletins (1969-1976) and UK DVSA vintage vehicle inspection statistics (1980-1995). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI WC.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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