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Audi CAXA Specifications
| Engine Model: Audi CAXA |
| Engine Type: 4-cycle inline 4-cylinder DOHC 16-valve liquid-cooled gasoline |
| Total Displacement: 86.3 cu.in (1.39 L) |
| Rated Engine Power: 121 Hp (90 kW) at 5000 rpm |
| Fuel System Type: Direct fuel injection |
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| General Technical Data |
The Audi CAXA engine is a 1.4-liter, four-cylinder
petrol powerplant derived from the Volkswagen Group’s EA111 engine family.
Engineered for compact vehicles, it incorporates a single turbocharger combined
with direct fuel injection, marketed under the FSI and TSI designations. This
unit was produced from approximately 2007 through 2015, serving as a balance
between performance and fuel efficiency in the Audi model range.
Engine Code: CAXA.
Displacement: 1390 cc (1.4 L).
Configuration: Inline 4-cylinder.
Valvetrain: Dual overhead camshafts (DOHC) actuating 4 valves per cylinder,
total 16 valves.
Bore: 76.5 mm (3.012 in).
Stroke: 75.6 mm (2.976 in).
Compression Ratio: 10.0:1.
Induction System: Single turbocharger with an air-to-air intercooler.
Fuel System: Direct injection managed by a Bosch Motronic MED17 engine control
unit.
Camshaft Drive: Maintenance-free timing chain situated at the rear of the
engine.
Power Output: Maximum power is 90 kW, equivalent to 122 PS (121 hp), achieved at
5000 rpm.
Torque Output: Max torque is 200 Nm (148 lb-ft), delivered across a plateau from
1500 to 4000 rpm.
Emission Standard: Certified to Euro 5 emission regulations.
Fuel Requirement: Super unleaded gasoline with a minimum octane rating of 95
RON.
Engine Oil Capacity: The total oil capacity, inclusive of the oil filter, is 3.6
L (3.8 US qt).
Oil Specification: For vehicles operating on extended LongLife service
intervals, the oil must conform to Volkswagen standard VW 504 00, with a
viscosity grade of 5W-30. For fixed-interval service schedules, the
specification is VW 502 00, permitting viscosities of 0W-30, 0W-40, or 5W-40.
Cooling System Capacity: The total coolant system volume is 5.6 L (5.9 US qt).
Coolant Type: The engine requires G12++ or the later purple-colored G13 coolant
concentrate mixed with demineralized water.
Ignition System: Spark plugs are specified as NGK PZFR6R. The electrode gap must
be maintained between 0.8 and 0.9 mm (0.031 to 0.035 in).
Firing Order: The ignition sequence is 1-3-4-2.
| Cylinder Block |
The cylinder block is constructed from gray cast iron, a design choice providing robustness for the turbocharged application. The open-deck design facilitates coolant flow around the cylinder bores. The block integrates the main bearing caps as a single, rigid cast structure to enhance bottom-end stiffness. The oil pan is a pressed steel component sealed to the block with a liquid gasket.
| Cylinder Head and Valves |
The cylinder head is manufactured from lightweight aluminum alloy and features a cross-flow design with the camshaft drive located on the transmission side. The dual overhead camshafts are supported directly in the bearing bores without separate bearing caps.
Valve actuation is accomplished via roller finger followers with hydraulic lash adjusters, eliminating the need for manual valve clearance adjustments. Intake and exhaust valves are arranged in a pent-roof combustion chamber. The hollow camshafts are assembled using the sintered cam lobe process.
| Fuel System |
The fuel system employs high-pressure direct injection. A belt-driven high-pressure fuel pump, mounted on the cylinder head, pressurizes fuel to levels up to 150 bar (2175 psi). The Bosch Motronic MED17 engine control unit governs the injectors, enabling stratified and homogeneous combustion modes for optimized power and fuel consumption. A returnless low-pressure fuel supply system, utilizing a fuel pump module inside the fuel tank, delivers fuel to the high-pressure pump.
| Lubrication System |
A pressure-controlled lubrication system is utilized. A toothed chain drives a dual-stage oil pump from the crankshaft. This variable-displacement oil pump adjusts its output to match engine load and speed, reducing parasitic losses.
The oil circuit includes a full-flow oil filter with an integrated bypass valve and an oil cooler integrated into the oil filter housing. The system is designed to maintain stable oil pressure for the turbocharger bearings and the hydraulic valve lash adjusters.
| Cooling System |
The cooling system operates on a cross-flow principle with a main radiator supplemented by an auxiliary coolant cooler for the turbocharger. A map-controlled thermostat regulates the coolant temperature, allowing the engine to operate at higher temperatures under light loads to reduce friction and fuel consumption.
An electric water pump provides supplementary circulation for the turbocharger after engine shutdown, preventing localized overheating. The heater circuit is integrated into the main cooling loop.
| Other Systems |
The engine is equipped with a forced crankcase ventilation system incorporating a cyclone oil separator to prevent oil mist from entering the intake tract. The intake manifold is made of plastic and integrates the intercooler charge air ducts.
The exhaust manifold is integrated into the cylinder head, a design that reduces weight and allows the catalytic converter to reach operating temperature more rapidly. The turbocharger is mounted directly to this integrated manifold. The engine management system controls a drive-by-wire electronic throttle body, which eliminates a mechanical cable connection.
| Dimensions and Weight |
The overall dimensions of the engine assembly, without ancillary components, measure 650 mm (25.6 in) in length, 520 mm (20.5 in) in width, and 650 mm (25.6 in) in height. The complete engine weight, including the turbocharger, intake manifold, and standard accessories, is 118 kg (260 lb). The long engine, including the transmission bell housing and exhaust manifold, has a shipping weight near 125 kg (276 lb).
| Maintenance Data |
Engine oil and oil filter change intervals are determined by the vehicle’s service regime. LongLife service allows intervals up to 30,000 km (18,600 mi) or two years, while fixed intervals are generally set at 15,000 km (9,300 mi) or one year. The timing chain is designed for the life of the engine but should be inspected for elongation at regular intervals, particularly if timing-related faults occur.
Spark plug replacement is specified at 60,000 km (37,000 mi). The fuel filter is integrated with the in-tank fuel pump and is not a regular maintenance item. Coolant should be tested for frost protection and corrosion inhibitor effectiveness every two years.
| Tightening Torques |
Cylinder Head Bolts:
Stage 1: 15 Nm (11 lb-ft)
Stage 2: 30 Nm (22 lb-ft)
Stage 3: Additional 90° turn
Stage 4: Additional 90° turn
Connecting Rod (Big End) Bolts:
M8 bolts: 30 Nm (22 lb-ft) plus an additional 90° turn.
Standard bolts: 20 Nm (15 lb-ft) plus an additional 90° turn.
Main Bearing Cap Bolts: 50 Nm (37 lb-ft) plus an additional 90° turn.
Flywheel or Driveplate Bolts: 60 Nm (44 lb-ft) plus an additional 90° turn.
Oil Pan (Sump) Bolts: 13 Nm (10 lb-ft).
Camshaft Bearing Caps: 8 Nm (6 lb-ft).
High-Pressure Fuel Pump Mounting Bolts: 20 Nm (15 lb-ft).
Spark Plugs: 25 Nm (18 lb-ft).
| Vehicle Applications |
Audi A1 (8X) model years 2010 to 2015
Audi A3 (8P) model years 2007 to 2012
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