The Audi AKG is a 1,781 cc, inline-four petrol engine produced between 1991 and 1994. It belongs to Audi's EA827 engine family and features a single overhead camshaft (SOHC) with 8 valves, along with multi-point fuel injection (MPI). In standard tune, it delivers 85 kW (115 PS) at 5,800 rpm and 160 Nm of torque at 3,500 rpm, offering refined performance for compact and mid-size executive models.
Fitted to the Audi 80 (B4) and Audi A6 (C4), the AKG was engineered for balanced drivability and improved emissions compliance. It was designed to meet Euro 2 emissions standards, utilizing a three-way catalytic converter and closed-loop lambda control system. Its naturally aspirated design and SOHC valvetrain prioritized reliability and smooth operation over high specific output.
One documented concern is premature camshaft wear observed in early production units, particularly under sustained high-load conditions. This issue, highlighted in Audi Service Information Bulletin 01.1 89, stemmed from marginal oil pressure at idle and insufficient surface hardening on cam lobes. Later production engines received revised camshaft materials and updated oil pump calibration to mitigate wear risks.
All AKG production (1991–1994) complies with Euro 2 standards (VCA UK Type Approval #VCA/EMS/5682).
The Audi AKG is a 1,781 cc inline-four petrol engine engineered for mid-size Audi models (1991–1994). It combines multi-point fuel injection with SOHC valvetrain technology to deliver responsive urban performance and moderate fuel consumption. Designed to meet Euro 2 emissions standards, it balances durability with improved environmental performance over prior generations.
| 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 | 85 kW (115 PS) @ 5,800 rpm | |
| Torque | 160 Nm @ 3,500 rpm | |
| Fuel system | Bosch Motronic M2.8.1 MPI | |
| Emissions standard | Euro 2 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | N/A | |
| Timing system | Timing belt (non-interference design) | |
| Oil type | SAE 10W-40, API SG/CD | |
| Dry weight | 132 kg |
The naturally aspirated design provides linear throttle response ideal for city driving but requires strict adherence to 60,000 km timing belt replacement intervals to prevent valve interference. SAE 10W-40 oil meeting API SG/CD is recommended to ensure adequate camshaft lubrication under load. Fuel quality should meet EN 228 standards to maintain Motronic system longevity. Post-1991 models feature revised camshaft hardening and oil pump calibration, reducing wear risk. Catalytic converters on Euro 2 models are sensitive to leaded fuel; only unleaded petrol should be used. Lambda sensor maintenance is essential to prevent drivability issues and failed emissions tests.
Oil Specs: Requires SAE 10W-40, API SG/CD specification (Audi SIB 01.1 89). Compatible with ACEA A2-96.
Emissions: Euro 2 certification applies to all AKG production (1991–1994) (VCA Type Approval #VCA/EMS/5682).
Power Ratings: Measured under DIN 70020 standards. Output consistent across all markets (Audi Group PT-1990).
Audi Technical Information System (TIS): Docs A18720, A19005, SIB 01.1 89
VCA Type Approval Database (VCA/EMS/5682)
ISO 1585: Road vehicles — Test method for the measurement of specific power
The Audi AKG was used across Audi's B4/C4 platforms with longitudinal mounting. This engine received platform-specific adaptations-shorter intake manifolds in the 80 and revised exhaust routing in the A6-and from 1991 all units adopted the Euro 2-compliant variant with updated catalytic converter, 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 belt cover (Audi TIS A18800). The 7th VIN digit indicates engine type ('K' for AKG in B4/C4 chassis). All AKG units have smooth black valve covers. Critical differentiation from AEL/ABF: AKG uses Bosch Motronic M2.8.1 ECU with trapezoidal diagnostic connector, while AEL uses M2.5 with square port. Service parts require chassis verification—timing belts for B4 80 are incompatible with C4 A6 due to different accessory drive layouts (Audi SIB 02.3 91).
The AKG's primary reliability risk is camshaft wear in early production units, with elevated incidence in high-mileage or poorly maintained vehicles. Audi internal quality reports from 1992 noted increased warranty claims for cam lobe deterioration, while UK DVSA MOT data shows a notable share of emissions failures linked to degraded lambda control. Extended oil intervals and low-RPM operation increase wear risk, making adherence to service schedules and use of correct oil critical.
Analysis derived from Audi technical bulletins (1991-1994) and UK DVSA failure statistics (1992-1995). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI AKG.
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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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