The Audi KH is a 1,781 cc, inline-four, naturally aspirated petrol engine produced between 1982 and 1988. It was engineered as a durable, fuel-efficient powerplant for Audi's compact and mid-size vehicles of the 1980s. Featuring a single overhead camshaft (SOHC), 8-valve configuration, and Bosch K-Jetronic continuous fuel injection, it delivered 66 kW (90 PS) at 5,600 rpm and 137 Nm of torque at 3,500 rpm, providing smooth daily drivability.
Fitted primarily to the Audi 80 B2 and Audi 90 models, the KH engine was designed for economical, reliable transportation with minimal maintenance demands. Its engineering prioritized longevity and cold-weather reliability, making it a common choice in European and export markets. Emissions compliance was achieved through a catalytic converter and lambda feedback system, allowing post-1985 models to meet early iterations of European emissions directives.
One documented service concern involves the Bosch K-Jetronic fuel distributor, which can suffer from internal wear or clogging due to fuel contamination. This issue, referenced in Audi Service Information Bulletin 203 780 12, may lead to poor idle quality, hesitation, or uneven cylinder loading. Regular fuel system maintenance and use of high-quality fuel were emphasized in owner documentation to preserve system integrity.
Production years 1982–1985 meet pre-catalyst emissions standards; 1986–1988 models comply with EC Directive 83/351/EEC (equivalent to early Euro 1) (VCA UK Type Approval #VCA/AUDI/KH/86).
The Audi KH is a 1,781 cc inline-four SOHC petrol engine engineered for compact sedans and coupes (1982–1988). It combines Bosch K-Jetronic mechanical fuel injection with a cast-iron block for durability and ease of service. Designed to meet early European emissions requirements, it balances fuel economy with dependable performance for daily driving.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,781 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 86.4 mm | |
| Power output | 66 kW (90 PS) @ 5,600 rpm | |
| Torque | 137 Nm @ 3,500 rpm | |
| Fuel system | Bosch K-Jetronic continuous fuel injection | |
| Emissions standard | EC Directive 83/351/EEC (pre-Euro 1 / early Euro 1) | |
| Compression ratio | 9.3:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Single-row roller chain (SOHC) | |
| Oil type | SAE 10W-40, API SF/CC | |
| Dry weight | 138 kg |
The KH engine delivers predictable performance ideal for city and highway driving, but requires consistent use of clean, high-octane petrol to prevent K-Jetronic fuel distributor issues. SAE 10W-40 mineral oil is recommended with 15,000 km (9,300 mi) service intervals. The mechanical fuel injection system is robust but sensitive to fuel quality and vacuum leaks, requiring precise diagnostics. The timing chain is generally durable but should be inspected for stretch or guide wear during major service. Post-1985 models with catalytic converters require unleaded fuel and regular lambda sensor checks to maintain emissions compliance and prevent exhaust restrictions.
Oil Specs: Requires SAE 10W-40, API SF/CC specification (Audi Owner's Manual 80 B2). Supersedes earlier SAE 20W-50 recommendations.
Emissions: EC Directive 83/351/EEC applies to 1986–1988 models only (VCA Type Approval #VCA/AUDI/KH/86). Pre-1986 models are non-catalyst variants.
Power Ratings: Measured under DIN 70020 standards. Output varies slightly with ambient temperature and fuel quality (Audi TIS Doc. A82-KH40).
Audi Technical Information System (TIS): Docs A82-KH40, A82-KH41
Audi ETK Parts Catalogue: Engine Group KH
VCA Type Approval Database (VCA/AUDI/KH/86)
Bosch K-Jetronic Service Manual (Document 0 280 001)
The Audi KH was used across Audi's B2 platform with longitudinal mounting. This engine received platform-specific adaptations-fuel trim adjustments for higher-altitude markets and revised exhaust manifolds for catalytic converter integration-and from 1985 the facelifted Audi 80 models adopted lambda-controlled fuel injection, creating interchange limits. 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 A82-KH40). The 7th digit of the VIN indicates engine type ('K' for KH series). Pre-1985 models have a chrome valve cover and lack a catalytic converter; post-1985 units feature a black valve cover and integrated O2 sensor. Critical differentiation from 1.8E with KE-Jetronic: KH uses mechanical K-Jetronic (no ECU), while KE-Jetronic is electronic (with ECU). Service parts require model year verification—fuel distributors for catalyst models (1986+) are calibrated differently (Audi SIB 203 780 12).
The KH's primary reliability risk is K-Jetronic fuel distributor degradation, with elevated incidence in vehicles with infrequent use or poor fuel quality. Audi internal field reports from 1987 indicated a significant number of drivability complaints linked to fuel head wear, while VCA emissions testing shows older KH units frequently fail due to lambda system faults. Extended storage and ethanol-blended fuels accelerate internal corrosion, making fuel system maintenance and correct petrol selection critical.
Analysis derived from Audi technical bulletins (1982-1988) and UK VCA emissions failure statistics (1985-1995). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI KH.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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