Audi ABC Specifications
| Engine Model: Audi ABC |
| Engine Type: 4-cycle 6-cylinder SOHC 12-valve liquid-cooled gasoline |
| Total Displacement: 158.6 cu.in (2.59 L) |
| Rated Engine Power: 150 Hp (110 kW) at 5750 rpm |
| Fuel System Type: Multi-point fuel injection (MPFI) |
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The Audi ABC is a 2.6-liter, naturally
aspirated V6 gasoline engine. This powerplant represents an early and
significant evolution in Audi's engine lineup, marking a transition from
inline-five cylinder configurations to compact, narrow-angle V6
architecture. Featuring a 90-degree cylinder bank angle, two valves per
cylinder, and Bosch Motronic multi-point fuel injection, the ABC engine
was engineered for smooth power delivery and refined operation in Audi's
executive-class vehicles of the late 1980s and early 1990s.
Its design prioritized mechanical simplicity and robust torque
production over high-revving power, delivering a driving experience
characterized by smooth, linear acceleration. While not a
high-performance unit, the ABC established foundational design
principles for Audi's future V6 engines. Its durability is proven,
though attention to specific maintenance items, particularly the timing
belt and cooling system, is essential for long-term reliability.
Engine Type: V6 cylinder, 90-degree bank angle, liquid-cooled, naturally
aspirated, multi-point fuel injection (MPFI). Displacement: 2598 cc (2.6
L) / 158.6 cu.in.
Bore x Stroke: 82.5 mm x 81.0 mm / 3.25 in x 3.19 in.
Compression Ratio: 9.0:1.
Firing Order: 1-4-3-6-2-5.
Direction of Rotation: Clockwise (viewed from the front/flywheel end).
Maximum Power Output: 110 kW (150 hp) at 5750 rpm.
Maximum Torque Output: 225 Nm (166 lb-ft) at 3500 rpm.
Fuel Requirement: Unleaded gasoline, 91 RON (87 AKI).
Emission Standards Compliance: Euro 1 / US Federal emissions standards
of the late 1980s.
Material: Cast iron. This provides structural rigidity and durability,
contributing to engine weight.
Construction: 90-degree V6 configuration with a split crankcase. The
block is a closed-deck design. The crankshaft is supported by four main
bearings. The cylinder banks are offset to allow for shared crankpins.
Crankshaft: Forged steel crankshaft with 90-degree firing intervals.
Main bearing journal diameter: 65.0 mm / 2.559 in. Crankpin journal
diameter: 54.0 mm / 2.126 in.
Pistons: Aluminum alloy pistons with a dished crown design.
Connecting Rods: Forged steel connecting rods.
Material: Aluminum alloy.
Head Construction: Single overhead camshaft (SOHC) per bank, 12-valve
design (2 valves per cylinder). The camshafts are driven by a single,
centrally mounted timing belt.
Valve Arrangement: Valves are arranged in a wedge-type combustion
chamber. They are actuated directly by the camshaft lobes via bucket
tappets. Valve clearance is adjusted by replacing shims located on top
of the tappets. This is an interference engine. Variable Valve Timing:
None.
Valve Diameters: Intake: 40.0 mm / 1.575 in. Exhaust: 34.0 mm / 1.339
in.
Injection Type: Multi-point fuel injection (MPFI).
Engine Management: Bosch Motronic M1.3 or M2.3 system. This system
integrates control of fuel injection and ignition timing.
Fuel Delivery: A single electric in-tank fuel pump supplies constant
pressure to the fuel distribution rail.
Fuel Rail & Injectors: Six individual solenoid-operated fuel injectors,
one per cylinder.
Throttle Body: Single-bore, cable-operated throttle body with an
auxiliary air valve for cold idle.
Air Intake: Naturally aspirated via a plastic intake manifold with
integrated resonance flaps to optimize torque across the rev range.
Type: Pressure-fed, full-flow filtration with a gear-type oil pump.
Oil Pump: Gear-type pump, driven by the crankshaft.
Oil Filter: Spin-on canister type, mounted on the front lower section of
the engine block.
Oil Cooler: Not standard equipment on all applications.
Oil Capacity (including filter): 5.5 L / 5.8 US qt.
Recommended Oil Grade: High-quality engine oil meeting API SG/SH or VW
500 00 specification. Viscosity: 15W-40 or 10W-40. Operating Oil
Pressure: 2.0 bar at hot idle (2000 rpm), 4.0 bar at 2000 rpm. Imperial:
29 psi (idle), 58 psi (2000 rpm).
Type: Pressurized, single-circuit system.
Water Pump: Centrifugal pump, driven by the timing belt. This is a
critical service item.
Thermostat: Wax pellet type, opening temperature 87°C (189°F).
Coolant Capacity: 8.0 L / 8.5 US qt (entire system).
Coolant Type: Conventional ethylene glycol-based antifreeze (blue or
green).
Electrical System: 12-volt negative ground.
Ignition System: Distributor-based ignition with a single ignition coil.
Ignition timing is controlled by the Bosch Motronic ECU.
Engine Management: Bosch Motronic as specified. The system uses a
flapper-type air flow meter (AFM). Crankcase Ventilation: A closed
Positive Crankcase Ventilation (PCV) system.
Overall Length: 550 mm / 21.7 in.
Overall Width: 700 mm / 27.6 in.
Overall Height: 650 mm / 25.6 in.
Dry Weight: 165 kg / 364 lbs.
Engine Oil Change Interval: Every 10,000 km or 12 months. Severe service
intervals are 5,000 km or 6 months. Imperial: 6,200 miles / 3,100 miles.
Oil Filter Change: Every oil change. Fuel Filter Change: Every 60,000 km
(37,300 miles). Air Filter Change: Every 30,000 km (18,600 miles) or as
inspected. Timing Belt Replacement: This is an interference engine.
Replace the timing belt, tensioner, and idler rollers every 60,000 km
(37,300 miles) or 5 years.
The water pump must be replaced concurrently due to its timing belt
drive. Spark Plug Replacement: Standard copper-core spark plugs every
15,000 km (9,300 miles). Coolant Replacement: Every 2 years. Valve
Clearance Adjustment: Check and adjust (via shim replacement) every
30,000 km (18,600 miles). Clearance (cold): Intake: 0.20 mm (0.008 in).
Exhaust: 0.40 mm (0.016 in).
Cylinder Head Bolts: Torque-to-yield (TTY) bolts. Tighten in the
specified sequence to 40 Nm (30 lb-ft), then turn an additional 180 deg
(1/2 turn). Bolts are single-use.
Main Bearing Cap Bolts: 65 Nm (48 lb-ft).
Connecting Rod Cap Bolts: 30 Nm (22 lb-ft) + 90° turn (replace bolts).
Spark Plugs: 30 Nm (22 lb-ft).
Oil Drain Plug: 30 Nm (22 lb-ft).
Camshaft Sprocket Bolts: 90 Nm (66 lb-ft).
Flywheel to Crankshaft Bolts: 100 Nm (74 lb-ft).
Wheel Bolts: 120 Nm (89 lb-ft).
The Audi ABC 2.6L V6 engine was used in several Audi models from the
late 1980s through the mid-1990s, providing a smooth and torquey
alternative to inline-five cylinder engines.
Audi 100 (C3, 1988-1991): 100 2.6 E.
Audi 200 (C3, 1989-1991): 200 2.6.
Audi V8 (D1, 1990-1994): As the base engine in some markets.
Audi 80 (B3, 1988-1991): 80 2.6 E Quattro.
Audi Coupe (B3, 1988-1991): Coupe 2.6 E.
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