Audi’s five-cylinder engines of the 1980s were powerful, sporty engines that reinforced the brand’s “Vorsprung durch Technik” commitment.
These five-cylinder engines combined the efficiency of a four-cylinder with the power of a six-cylinder, resulting in lighter and more compact engine packages. A turbocharged version was a sensation.
|Engine type||Five-cylinder inline engine|
|Displacement||151.3 cu in (2480 cc)|
|Maximum power||335.2 hp (250 kW) @ 5400–6500 rpm|
|Maximum torque||331.9 lb ft (450 Nm) @ 1600–5300 rpm|
|Valves per cylinder||4 – Sodium Filled for cooling|
|Bore||3.24 in (82.5 mm)|
|Stroke||3.65 in (92.8 mm)|
|Compression ratio||10 : 1|
|Fuel system||FSI (homogeneous) direct injection with demand-based high and low|
fuel pressure regulation
Engine management without an air mass meter
|Fuel grade||91 AKI|
|Engine weight||403.4 lb (183 kg)|
|Engine management||Bosch MED 9.1.2|
|Exhaust emission standard||LEV II|
|Emissions control||Sensors upstream and downstream of the catalytic converter|
Because of its very short overall length, this engine lends itself very well to transverse mounting.
The cylinder block is made from high tensile strength cast iron. The strength of this material is needed because the connecting rod bearings and main bearings have relatively small widths. Piston cooling jets are mounted in the cylinder block.
The liquid sealants using during engine assembly and repair are specifically designated for various components.
The oil pan is constructed from two parts. The cast upper part acts as a baffle plate and is bolted to the crankcase. This upper part supports the oil pump, which is bolted to the cylinder block.
The lower part of the oil pan is made from sheet steel. It houses Oil Level Thermal Sensor G266 and the drain plug.
Both the front sealing flange and lower timing case cover are sealed against the cylinder block by a liquid sealant.
The forged steel crankshaft is supported by six main bearings.
A torsional vibration damper reduces radial vibration by the pistons and crankshaft. The damper, referred to as a viscodamper in repair
literature, uses a high viscosity silicone.
|Audi TT RS 2.5 ltr TFSI Reciprocating component||Specifications|
|Center-to-center distance between cylinders||3.46 in (88 mm)|
|Block height||8.66 in (220 mm)|
|Connecting rod length||5.66 in (144 mm)|
|Crankshaft main bearings||6|
|Main bearing diameter||2.28 in (58 mm)|
|Connecting rod bearing diameter||188 in (47.8 mm)|
Pistons and Connecting Rods
To better respond to high loads, the pistons are a “boxed” design. They have an asymmetrical skirt with beveled box walls on the thrust and counter-thrust sides. They are manufactured from a high heat resistant alloy and have cast in ring lands for the upper piston ring. Lower weight and low oil consumption characteristics were designed into these pistons.
Mini headland rings 451_027a
N2, taper-face piston ring
N1, asymmetrical, spherical,
steel nitride + PVD*
N3, DSF** ring with
*PVD = Physical Vapor Deposition is a coating process in which
the coating material is physically vapor-deposited (by kinetic
or impact energy) on a material in a vacuum environment.
- *Top-beveled oil control ring with coil expander
Reinforced threads M9 bolt
Optimized design with
large cross section