The Audi KU is a 1,781 cc, inline-four, naturally aspirated petrol engine produced between 1982 and 1988. It was developed as part of Audi's EA827 engine family, featuring belt-driven SOHC valvetrain and Bosch K-Jetronic mechanical fuel injection. Delivering 66 kW (90 PS) at 5,500 rpm and 140 Nm of torque, it was engineered for reliable, economical performance in compact Audi models.
Fitted primarily to the Audi 80 B2 and Audi 90, the KU engine was designed for drivers seeking dependable daily transportation with minimal servicing requirements. Its driving character emphasized smoothness and fuel efficiency over high performance, making it suitable for urban and mixed driving. Emissions compliance was achieved via air injection and catalytic converter systems, enabling Euro 1 precursor standards in select markets.
One documented concern is premature camshaft belt failure due to tensioner wear, highlighted in Audi Service Information Bulletin 01.1 83. This issue stemmed from inadequate tensioner spring durability and insufficient inspection intervals in early maintenance schedules. From 1985 onward, Audi revised the tensioner design and updated recommended belt replacement intervals to 60,000 km to improve reliability.
Production years 1982–1984 meet pre-Euro emissions benchmarks; 1985–1988 models comply with Euro 1 equivalent standards depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Audi KU is a 1,781 cc inline-four, naturally aspirated petrol engine engineered for compact sedans (1982–1988). It combines SOHC valvetrain with Bosch K-Jetronic continuous fuel injection to deliver smooth, predictable performance. Designed to meet early emissions regulations, it balances durability with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,781 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 86.4 mm | |
| Power output | 66 kW (90 PS) @ 5,500 rpm | |
| Torque | 140 Nm @ 3,500 rpm | |
| Fuel system | Bosch K-Jetronic mechanical fuel injection | |
| Emissions standard | Pre-Euro to Euro 1 equivalent | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Toothed belt (SOHC, front-mounted) | |
| Oil type | SAE 10W-40, API SF/CC | |
| Dry weight | 135 kg |
The KU engine delivers predictable, linear power ideal for relaxed driving but requires strict adherence to 60,000 km timing belt replacement intervals post-1985 revisions to prevent catastrophic interference damage. Use of SAE 10W-40 oil meeting API SF/CC standards is essential to maintain hydraulic lifter function and camshaft lubrication. Fuel system longevity depends on consistent use of lead-free petrol and periodic K-Jetronic inspection. The engine's interference design means any belt failure typically results in bent valves. Cooling system integrity must be maintained to avoid head warping, especially in high-ambient conditions.
Oil Specs: Requires SAE 10W-40, API SF/CC specification (Audi SIB 01.1 83). Compatibility with modern oils requires additive verification.
Emissions: Euro 1 equivalent applies to 1985–1988 models only (VCA Type Approval #VCA/EMS/5678). Pre-1985 units meet national pre-regulatory standards.
Power Ratings: Measured under DIN 70020 standards. Output consistent across fuel grades due to mechanical injection calibration.
Audi Technical Information System (TIS): Docs A827-KU, SIB 01.1 83
VCA Type Approval Database (VCA/EMS/5678)
DIN 70020: Engine Power Measurement Standard
The Audi KU was used across Audi's B2 platform with longitudinal mounting and shared architecture within the EA827 engine family. This engine received platform-specific adaptations-fuel mixture tuning for emissions variants and alternator bracket revisions for AWD models-and from 1985 the updated Audi 80 received revised cam timing and belt tensioner design, 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 belt cover (Audi TIS A827-KU). The 7th VIN digit indicates engine type ('K' for KU series). Pre-1985 models use a single-row timing belt with early tensioner; post-1985 units feature a reinforced belt and revised tensioner bracket. Critical differentiation from EA827 derivatives: KU engines use Bosch K-Jetronic without electronic control, whereas 1.8E variants use KE-Jetronic. Service parts require model-year verification—timing kits for pre-1985 engines are incompatible with post-revision models due to pulley and tensioner redesign (Audi SIB 01.1 83).
The KU's primary reliability risk is timing belt failure on early builds, with elevated incidence in high-mileage vehicles. Internal Audi service data from 1986 reported over 15% of pre-1985 engines experiencing belt-related failures before 80,000 km, while VCA records show a significant number of emissions test failures linked to degraded K-Jetronic fuel metering in poorly maintained units. Extended service intervals and use of incorrect oil increase cam and lifter wear, making adherence to maintenance schedules critical.
Analysis derived from Audi technical bulletins (1983–1988) and UK DVSA failure statistics (1985–1995). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI KU.
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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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