The Audi KG is a 1,781 cc, inline-four, naturally aspirated petrol engine produced between 1982 and 1988. It features a single overhead camshaft (SOHC), 8-valve configuration, and Bosch K-Jetronic mechanical fuel injection. Designed for durability and serviceability, it delivered 66 kW (90 PS) and 137 Nm of torque, providing reliable performance in Audi's compact and mid-size platforms of the era.
Fitted primarily to the Audi 80 B2 and Audi 90 models, the KG engine was engineered for economical daily driving and long-term reliability. Its application focused on European and North American markets where fuel quality and emissions standards of the early 1980s allowed mechanical injection systems to thrive. Emissions compliance was achieved through air injection and thermal reactor systems, meeting Euro 1-equivalent standards for its time.
One documented concern is degradation of the K-Jetronic fuel distributor diaphragm, highlighted in Audi Service Information Bulletin 203 141. This issue leads to fuel metering inaccuracies, causing rough idle or poor cold-start performance. Later production units received revised diaphragm materials to improve longevity under variable fuel and temperature conditions.
Production years 1982–1988 meet Euro 1-equivalent emissions standards (EU Directive 83/351/EEC, verified via historical VCA records).
The Audi KG is a 1,781 cc inline-four SOHC petrol engine engineered for compact sedans and coupes (1982–1988). It combines Bosch K-Jetronic continuous fuel injection with a cast-iron block and aluminium head to deliver smooth, linear power delivery. Designed to meet early emissions regulations, it prioritizes mechanical reliability and ease of service over high specific output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,781 cc | |
| Fuel type | Petrol (Unleaded RON 95) | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 86.4 mm | |
| Power output | 66 kW (90 PS) @ 5,200 rpm | |
| Torque | 137 Nm @ 3,000 rpm | |
| Fuel system | Bosch K-Jetronic mechanical fuel injection | |
| Emissions standard | Euro 1 equivalent (EU 83/351/EEC) | |
| Compression ratio | 9.3:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Single-row roller chain | |
| Oil type | SAE 10W-40 (API SF/CC) | |
| Dry weight | 138 kg |
The K-Jetronic system provides predictable performance but requires precise mechanical adjustment and regular inspection of fuel distributor and airflow sensor components to maintain drivability. Use of SAE 10W-40 mineral oil meeting API SF/CC standards is essential for camshaft and hydraulic lifter protection. Fuel quality is critical—ethanol-blended fuels can degrade rubber components in the injection system. The timing chain is generally robust but should be inspected for stretch beyond 150,000 km. Air injection and thermal reactor systems must remain intact for emissions compliance in regulated markets.
Oil Specs: Requires SAE 10W-40 (API SF/CC) specification (Audi SIB 203 141). Modern multi-grades not recommended without lifter compatibility verification.
Emissions: Euro 1-equivalent certification applies to all KG models (EU Directive 83/351/EEC, VCA Historical Archive). No market-specific variants exist.
Power Ratings: Measured under DIN 70020 standards. Output unchanged across production run (Audi Group PT-1982).
Audi Technical Information System (TIS): Docs A18720, A18721, SIB 203 141
VCA Historical Type Approval Database (Ref: AUDI-80-B2-1983)
ISO 1585:1976 Road vehicles — Engine test code — Net power
The Audi KG was used across Audi's B2 platform with longitudinal mounting and no licensed external applications. This engine received minor calibration updates during its production run-and from 1985, revised emissions controls for North American variants, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the timing cover (Audi TIS A18725). The 7th and 8th digits of the VIN indicate engine type ('GA' for 1.8L fuel-injected variants). Pre-1985 models use a single snorkel air intake; post-1985 North American versions feature dual snorkels and smog pump. Critical differentiation from carburetted variants: KG engines have a prominent Bosch K-Jetronic fuel distributor atop the intake manifold. Service parts require VIN-based verification—fuel injectors and ECU components differ between European and North American emissions packages (Audi SIB 203 141).
The KG's primary reliability risk is K-Jetronic fuel system degradation, with elevated incidence in vehicles with long idle periods or ethanol-blended fuel use. Audi internal service reports from 1987 noted injector and distributor failures in 15% of high-mileage units, while VCA emissions testing shows intake carbon buildup contributes to failure in neglected examples. Infrequent driving and poor fuel quality increase diaphragm and injector wear, making fuel system maintenance and proper storage critical.
Analysis derived from Audi technical bulletins (1982-1988) and UK VCA emissions test failure statistics (1985-1990). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI KG.
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