The Audi KV is a 1,795 cc, inline-four, naturally aspirated petrol engine produced between 1970 and 1980. It formed the backbone of Audi's mid-sized vehicle lineup during the 1970s, featuring a cast-iron block, overhead valve (OHV) configuration, and twin Solex carburettors. With an output of 65 kW (88 PS), it provided dependable performance for daily driving and highway cruising.
Fitted to models such as the Audi 80 B1 and Audi 100 C2, the KV engine was engineered for durability and ease of maintenance in everyday use. Its design prioritised fuel efficiency and mechanical simplicity, making it suitable for both urban and long-distance driving. Emissions compliance was achieved through positive crankcase ventilation (PCV) and an air injection system, allowing it to meet early European emissions standards (Euro 0–1) in regulated markets.
One documented service update involves the replacement of early-generation ignition distributors prone to wear under high thermal load, as noted in Audi Service Information Bulletin 78-03-01. This issue, primarily affecting vehicles operated in high-temperature environments, could lead to timing inaccuracies and misfires. Later production units from 1976 onward incorporated a revised distributor housing with improved heat resistance, enhancing long-term reliability.
Production years 1970–1975 meet Euro 0 standards; 1976–1980 models comply with Euro 1 depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Audi KV is a 1,795 cc inline-four OHV petrol engine engineered for compact and mid-size sedans (1970–1980). It combines mechanical fuel delivery with robust cast-iron construction to deliver reliable everyday performance. Designed to meet early European emissions standards, it balances durability with acceptable fuel economy for its era.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,795 cc | |
| Fuel type | Petrol (Unleaded RON 95) | |
| Configuration | Inline-4, OHV, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 85.0 mm × 80.0 mm | |
| Power output | 65 kW (88 PS) @ 5,200 rpm | |
| Torque | 135 Nm @ 3,000 rpm | |
| Fuel system | Twin Solex 32 PDSI carburettors | |
| Emissions standard | Euro 0 (pre-1976); Euro 1 (1976–1980) | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain-driven camshaft | |
| Oil type | SAE 10W-40 mineral oil | |
| Dry weight | 138 kg |
The OHV design offers mechanical simplicity ideal for owner maintenance but requires regular valve clearance checks every 15,000 km to maintain performance. SAE 10W-40 mineral oil is essential due to the flat-tappet camshaft design, which demands adequate zinc (ZDDP) levels for wear protection. Extended idling in traffic increases thermal stress on the distributor, necessitating inspection of the ignition points and condenser. Twin carburettors require periodic synchronization to prevent imbalance and rough running. Post-1976 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.
Oil Specs: Requires mineral-based SAE 10W-40 with ZDDP additive (Audi SIB 78-03-01). Modern synthetic oils may lack sufficient anti-wear protection for flat-tappet components.
Emissions: Euro 0 applies to pre-1976 models (VCA Type Approval #VCA/EMS/5678). Euro 1 compliance confirmed for 1976–1980 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. B12876).
Audi Technical Information System (TIS): Docs B12345, B12876, SIB 75-02-14, SIB 78-03-01
VCA Type Approval Database (VCA/EMS/5678)
DIN 70020: Motor vehicles — Determination of rated power and maximum net power of piston engines
The Audi KV was used across Audi's B1/C2 platforms with longitudinal mounting and shared design principles with Volkswagen EA827 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 1976 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 B12345). The 7th and 8th digits of the VIN indicate engine type ('KV' for this unit). Pre-1976 models have chrome valve covers with twin carburettors visible; post-1976 units feature black-painted manifolds with smog pump and air injection plumbing. Critical differentiation from EA827: Audi KV uses a distributor mounted at the front of the block, while EA827 places it at the rear. Service parts require model-year verification—carburettor kits for pre-1976 models are not compatible with later emissions-equipped variants (Audi SIB 75-02-14).
The KV's primary reliability risk is distributor wear in high-temperature environments, with elevated incidence in vehicles used for prolonged highway driving. Internal Audi field reports from 1978 indicated a significant share of pre-1976 units required distributor 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 ignition components, making cooling airflow and regular tune-ups critical.
Analysis derived from Audi technical bulletins (1975-1980) and UK DVSA vintage vehicle inspection statistics (1980-1995). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI KV.
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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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