AWP 1.8T Engine - Complete Technical Specifications

ENGINE OVERVIEW

ENGINE CODE

AWP

DISPLACEMENT

1,781 cc

BORE × STROKE

81.0 × 86.4mm

COMPRESSION

9.5:1

POWER

180 HP

TORQUE

173 lb-ft

BLOCK

Cast Iron

HEAD

Aluminum 20V

VALVETRAIN

DOHC 20V

TURBO

KKK K03s

FUEL

Port Injection

MGMT

Bosch ME7.5

180 HP 1.8T VARIANTS

Three closely related engine codes shared the 180 HP rating in the MK4 platform.

CODE	YEARS	MODELS	ECU	KEY DIFFERENCES
AWD	1999-2000	Passat	Bosch ME7.1	Longitudinal mount. Different intake manifold. Earlier ECU revision.
AWW	1999-2001	Beetle, Golf, Jetta	Bosch ME7.5	Transverse mount. Earlier revision of transverse 180 HP. SAI system.
AWP	2001-2005	GTI, Jetta, Beetle	Bosch ME7.5	Updated revision. Revised intake manifold. Improved knock control. Most common in GLI.

BLOCK & CRANKSHAFT

Block Material

Cast iron (06A block)

Cylinder Bore

81.00mm (standard) — Max oversize: 81.50mm (+0.50mm)

Deck Height

220.0mm (nominal)

Max Cylinder Taper

0.02mm

Max Cylinder Out-of-Round

0.01mm

Crankshaft Material

Forged steel, nitride hardened

Main Journal Diameter

54.00mm (standard) — Undersizes: -0.25mm, -0.50mm, -0.75mm

Rod Journal Diameter

47.80mm (standard) — Undersizes: -0.25mm, -0.50mm

Main Bearing Clearance

0.03 – 0.08mm (oil clearance)

Rod Bearing Clearance

0.03 – 0.06mm (oil clearance)

Crankshaft End Play

0.07 – 0.17mm (thrust bearing at #3 main)

Main Bearing Caps

5 main caps, ladder frame (bedplate) design

Max Crank Runout

0.03mm TIR

Bearing shell color coding: VW uses a color-coded system to match bearing clearances. Main and rod bearings come in color-coded sizes (Red, Blue, Yellow). Always match using the codes stamped on the block and crank — do not assume standard size.

PISTONS & CONNECTING RODS

Piston Type

Cast aluminum, dish-top design

Piston Diameter

80.97 – 81.00mm (3 size grades: A, B, C)

Piston-to-Wall Clearance

0.01 – 0.03mm

Compression Ring Gap

0.20 – 0.40mm (top ring), 0.25 – 0.50mm (second ring)

Oil Ring Gap

0.25 – 0.50mm

Piston Pin Diameter

19.00mm (press fit in rod)

Piston Pin Type

Full-floating in piston, press-fit in rod

Connecting Rod Length

144.0mm (center-to-center)

Rod Material

Forged steel (cracked cap design)

Rod Bearing Width

17.2mm

Rod Big End Bore

51.80mm (with bearing installed: 47.80mm journal fit)

Rod Bolt Torque (OEM)

30 Nm + 90° (TTY — replace after removal)

Rod Bolt Torque (ARP)

50 ft-lbs with ARP moly lube (ARP 204-6004)

OEM rod bolts are torque-to-yield (TTY) and must be replaced after removal. For any performance build, ARP rod bolts (204-6004) are a mandatory upgrade — they are reusable and provide consistent clamping force. Stock rods with ARP bolts are reliable to approximately 350 WHP.

CYLINDER HEAD

Head Material

Aluminum alloy, crossflow design

Valves Per Cylinder

5 (3 intake, 2 exhaust)

Total Valves

20 (12 intake, 8 exhaust)

Intake Valve Diameter

27.5mm (6mm stem)

Exhaust Valve Diameter

30.0mm (6mm stem)

Valve Stem-to-Guide Clearance

Intake: 0.02 – 0.05mm / Exhaust: 0.03 – 0.06mm

Head Gasket Surface Flatness

Max distortion: 0.10mm

Min Head Height (Resurfaced)

139.20mm (below this, discard head)

Camshaft Drive

Timing belt to intake cam, chain to exhaust cam

Cam Chain Tensioner

Hydraulic, automatic (058 109 088 K — revised part)

Lifter Type

Hydraulic roller followers (self-adjusting)

Valve Spring Free Length

~38.5mm (OEM)

Valve Spring Installed Height

~34.0mm at seat

TORQUE SPECIFICATIONS

All specifications from VW Factory Repair Manual. TTY (torque-to-yield) bolts must be replaced after removal — they are designed for single use only. Always use calibrated torque wrenches and angle gauges where specified.

CYLINDER HEAD

FASTENER	SPEC	NOTES
Head bolts (OEM TTY)	40 Nm + 60° + 60°	4-stage torque sequence. Replace bolts after removal. Tighten in VW-specified pattern.
Head studs (ARP 204-4701)	75 ft-lbs	With ARP moly lube on threads and under nut. Reusable. Tighten nuts in same sequence as OEM.
Cam bearing caps	10 Nm	Tighten evenly in sequence from center outward.
Camshaft sprocket bolt	65 Nm	Hold cam with wrench flats during tightening.
Valve cover bolts	10 Nm	Use new gasket. Tighten in cross pattern.

BOTTOM END

FASTENER	SPEC	NOTES
Main bearing cap bolts	30 Nm + 90°	TTY — replace after removal. Tighten in sequence.
Connecting rod bolts (OEM)	30 Nm + 90°	TTY — single use. Cracked-cap design, do not mix caps.
Connecting rod bolts (ARP)	50 ft-lbs	ARP 204-6004 with ARP moly lube. Reusable.
Flywheel bolts	60 Nm + 90°	TTY — replace after removal.
Crank pulley bolt	90 Nm + 90°	Use impact gun or crank lock tool.
Oil pan bolts	15 Nm	Use new gasket/sealant. Tighten in cross pattern.
Oil drain plug	30 Nm	Use new crush washer each change.
Oil pump bolts	10 Nm	Check chain and sprocket wear during service.

TIMING SYSTEM

FASTENER	SPEC	NOTES
Timing belt tensioner	25 Nm	Set tension before final torque. Verify with TDC alignment.
Timing belt cover bolts	10 Nm	Upper and lower covers.
Water pump bolts	15 Nm	Always replace with timing belt. Use new O-ring/gasket.
Thermostat housing	15 Nm	Use new O-ring.

INTAKE & EXHAUST

FASTENER	SPEC	NOTES
Intake manifold bolts	20 Nm	Use new gasket. Tighten from center outward.
Exhaust manifold nuts	25 Nm	Apply anti-seize. Replace studs if corroded.
Turbo-to-exhaust manifold	25 Nm	Use new gasket. Check stud condition.
Downpipe-to-turbo nuts	30 Nm	Spring-loaded nuts on V-band or 3-bolt flange.
Spark plugs	25 Nm	NGK PFR6Q or equivalent. Gap: 0.028" (0.7mm) for turbo.

COOLING SYSTEM

Coolant Type

G12 (purple/pink) — VW TL 774 D. G12++ or G13 are acceptable replacements.

System Capacity

~6.0 liters (6.3 qt) including heater core

Thermostat Opens

87°C (189°F) — fully open at 102°C (216°F)

System Pressure

1.4 – 1.6 bar (20-23 psi) — cap rated at 1.5 bar

Fan On Temperature

Low speed: 92°C / High speed: 100°C (ECU controlled)

Water Pump Drive

Timing belt driven (replace with every belt service)

Coolant Flange (Crack Pipe)

06A 121 133 J — Common failure. Replace with aluminum upgrade.

Coolant Temp Sensor

059 919 501 A (4-pin, green top)

NEVER mix G12 (pink/purple) with G11 (blue/green) coolant. They use incompatible corrosion inhibitors and will gel, clogging the system. When switching, flush the entire system thoroughly. G13 (purple, VW TL 774 J) is backwards-compatible with G12.

TURBO SYSTEM

Turbocharger

KKK K03s (BorgWarner) — part 06A 145 713 D (revised)

Compressor Wheel

46mm inducer / 60mm exducer

Turbine Wheel

44mm inducer / 50mm exducer

Max Boost (Stock Tune)

~14 psi (0.96 bar) peak, tapering to ~8-10 psi at redline

Wastegate Control

N75 solenoid valve (ECU-controlled electronic boost)

N75 Valve

028 906 283 F — controls boost via wastegate actuator

Wastegate Actuator

Integrated, spring-loaded — opens ~7 psi without N75 control

Diverter Valve (OEM)

06A 145 710 N (revised "710N" — piston type)

Oil Feed Line

Banjo bolt with restrictor — replace with every turbo service

Oil Return Line

Rubber hose to block — check for kinks/leaks during service

Intercooler

Side-mount air-to-air (SMIC) — driver side fender area

FUEL SYSTEM

Fuel Pressure

3.0 bar (43.5 psi) at idle, vacuum referenced

Fuel Pump

In-tank electric, ~120 LPH (stock)

Injectors

4× port injectors, ~285cc/min (stock)

Injector Impedance

High impedance (~14 ohm)

Fuel Filter

Under-car inline filter — replace every 20,000 miles

Fuel Type

91 octane minimum (premium recommended)

ECU

Bosch ME7.5 — flashable via OBD2 port

MAF Sensor

06A 906 461 L (Bosch hot-film type)

Oxygen Sensors

Pre-cat: wideband / Post-cat: narrowband

FUELING UPGRADES BY POWER LEVEL

Stock injectors and fuel pump max out around 250 WHP. Beyond that, upgraded fueling is mandatory.

POWER TARGET	INJECTORS	FUEL PUMP	FUEL PRESSURE
Up to 250 WHP	Stock 285cc	Stock in-tank	Stock 3.0 bar
250 – 320 WHP	550cc (Siemens Deka)	Walbro 255 LPH	3.5 bar FPR
320 – 400 WHP	630cc (ID1050x)	Walbro 450 or AEM 340	4.0 bar FPR
400+ WHP	1000cc+ (ID1300x)	Dual pump or surge tank	4.0+ bar FPR

1.8T 20V TURBO

AWP ENGINE PARTS