DOHC 24-Valve
2.8L VR6 24V Engine
Complete technical specifications from official VW repair manuals. The 24-valve VR6 adds DOHC heads with four valves per cylinder and variable valve timing, increasing power to 201-204 PS.
2792cc
Displacement
150 kW
204 PS @ 6,200 RPM
274 Nm
@ 3,200 RPM
81.0 × 90.3
Bore × Stroke (mm)
10.5:1
Compression
15°
V-Angle
24V VR6 Engine Codes
2.8L FamilyBDF
1999-2005 • USA Market
201 hp (148 kW)
Primary USA code for Golf Mk4 V6 and Jetta GLX VR6. Variable intake manifold and VVT on intake cam. Most common 24V VR6 in North America.
AUE
1999-2005 • European Market
204 PS (150 kW)
European variant for Golf V6 and Bora V6 4Motion. Slightly higher output than BDF. Available with Haldex-based 4Motion AWD.
BDE
2001-2003 • Audi A3
204 PS (150 kW)
Audi-specific variant for A3 8L V6. European market only. Limited production numbers.
24V DOHC Architecture
Design OverviewValvetrain Design
- ConfigurationDOHC 24-valve
- Valves Per Cylinder4 (2 int / 2 exh)
- Camshafts2 (single shared head)
- Valve ActuationRoller rocker arms
- Hydraulic AdjustmentYes (HVA)
- VVT SystemIntake cam only
Timing System
- Primary DriveDuplex chain
- Chain LocationTransmission side
- TensionerHydraulic (oil pressure)
- Guide RailsPlastic (wear item)
- VVT Range~42° crankshaft
- VVT ControlN205 solenoid valve
Timing Chain System Maintenance
The 24V VR6 timing chain system is more complex than the 12V. Plastic guides wear over time, causing chain slap and timing issues. Inspect at 100,000 miles and replace tensioners/guides preventatively. Chain replacement requires transmission removal - budget 12-16 hours labor.
Crankshaft Specifications
Rep. Gr. 13Crankshaft Dimensions
- TypeDie-forged steel
- Main Bearings7
- Main Journal Diameter58.0 mm
- Rod Journal Diameter52.0 mm
- Axial Play (New)0.07-0.17 mm
- Axial Play (Wear Limit)0.25 mm
- Radial Clearance (New)0.03-0.08 mm
- Radial Clearance (Limit)0.17 mm
Crankshaft Design
- Rod Journal Offset22°
- Firing Interval120°
- Firing Order1-5-3-6-2-4
- BalanceInternally balanced
- Thrust BearingBearing #4
- Pulley BoltM18 x 1.5
Oil System Specifications
LubricationOil Pump
- TypeGerotor (internal gear)
- DriveDirect from crankshaft
- Relief Valve Pressure4.5-5.5 bar
- Oil Pressure @ Idle (warm)≥ 0.8 bar
- Oil Pressure @ 3000 RPM3.5-4.5 bar
- Warning Light0.3 bar
Oil Specifications
- VW SpecificationVW 502.00
- Recommended Grade5W-40 Synthetic
- Capacity with Filter5.5L (5.8 qt)
- Capacity without Filter5.0L (5.3 qt)
- Filter TypeCartridge
- Piston Cooling JetsYes (6 total)
Oil Quality Critical for VVT
The 24V VR6's variable valve timing relies on clean oil for proper operation. The VVT solenoid (N205) can clog with sludge if oil changes are neglected. Always use VW 502.00 specification synthetic oil and maintain 5,000-7,500 mile change intervals.
Pistons & Connecting Rods
Rotating AssemblyPiston Specifications
- MaterialCast aluminum
- Crown DesignTilted (15° offset)
- Measurement Point15mm from skirt
- Max Deviation0.04 mm
- Piston-to-Wall Clearance0.01-0.03 mm
- Pin Diameter22 mm
- Pin TypeFull-floating
Connecting Rod
- MaterialForged steel
- Length (C-to-C)164 mm
- Bearing Axial Play (New)0.15-0.40 mm
- Bearing Axial Play (Limit)0.50 mm
- Radial Clearance (New)0.02-0.06 mm
- Radial Clearance (Limit)0.10 mm
- Rod Bolt TypeTorque-to-yield
| Ring | Gap (New) | Gap (Limit) | Groove Clearance (New) | Groove Clearance (Limit) |
|---|---|---|---|---|
| Compression Ring 1 | 0.25-0.45 mm | 1.0 mm | 0.04-0.08 mm | 0.15 mm |
| Compression Ring 2 | 0.25-0.45 mm | 1.0 mm | 0.03-0.06 mm | 0.15 mm |
| Oil Control Ring | 0.25-0.50 mm | 1.0 mm | 0.02-0.05 mm | 0.12 mm |
Cylinder Head & Valvetrain
DOHC 24-ValveCylinder Head
- ConfigurationSingle shared head
- MaterialAluminum alloy
- Valves per Cylinder4 (2 int / 2 exh)
- Max Distortion0.1 mm
- Minimum Height139.8 mm
- Max Resurface0.3 mm total
Camshaft
- ConfigurationDOHC (2 cams)
- DriveDuplex chain
- Bearings5 journals each
- Axial Play (New)0.10-0.30 mm
- Axial Play (Limit)0.40 mm
- VVT CamIntake only
| Specification | Intake Valve | Exhaust Valve |
|---|---|---|
| Head Diameter | 33.2 mm | 30.2 mm |
| Stem Diameter | 6.0 mm | 6.0 mm |
| Seat Angle | 45° | 45° |
| Stem-to-Guide Clearance (New) | 0.02-0.05 mm | 0.03-0.06 mm |
| Stem-to-Guide Clearance (Limit) | 0.10 mm | 0.13 mm |
Torque Specifications
Official VW SpecsCylinder Head & Valvetrain
Cylinder head bolts (Stage 1)40 NmAll bolts
Cylinder head bolts (Stage 2)60 NmAll bolts
Cylinder head bolts (Stage 3)+ 90°Replace bolts
Cylinder head bolts (Stage 4)+ 90°Final pass
Camshaft bearing caps10 NmSequence critical
Camshaft sprocket bolt100 NmUse counterhold
VVT actuator bolt60 Nm
Crankshaft & Block
Main bearing cap bolts (M10)65 Nm + 90°Replace bolts
Connecting rod bolts30 Nm + 90°Replace bolts
Crankshaft pulley bolt90 Nm + 90°Replace bolt
Flywheel bolts100 Nm + 90°Replace bolts
Oil pan bolts (M6)10 Nm
Oil drain plug30 NmNew washer
Timing Chain & Accessories
Chain tensioner housing20 Nm
Chain guide rail bolts10 Nm
Upper timing cover10 Nm
Water pump bolts15 Nm
Intake & Exhaust
Intake manifold bolts20 Nm
Exhaust manifold nuts25 NmNew gasket
Downpipe to manifold25 NmNew gasket
Cooling & Fuel System
SpecificationsCoolant Specifications
- TypeG12 Pink
- VW SpecificationTL VW774 D/F
- Capacity8.0L (8.5 qt)
- Thermostat Opens87°C (189°F)
- Operating Temp85-105°C
Fuel System
- Injection TypeMulti-point
- Fuel Pressure3.0 bar
- Injector TypeTop-feed
- ECUBosch ME7.1
- Fuel Requirement91+ AKI (Premium)
Tuning Potential
PerformanceNaturally Aspirated
220-240 hp
Modifications
- Short runner intake manifold
- Headers/exhaust manifold
- High-flow exhaust
- Cold air intake
- ECU tune
Notes
- 24V head flows excellent
- VVT provides broad torque
- Limited gains vs cost
Supercharged
280-350 hp
Modifications
- Centrifugal supercharger
- 6-10 psi boost
- Standalone or flash tune
- Upgraded fuel injectors
- Intercooler required
Notes
- VF Engineering kits popular
- Stock internals to ~320 hp
- Smooth power delivery
Turbocharged
400-650+ hp
Modifications
- Custom turbo manifold
- Precision or Garrett turbo
- Standalone ECU
- Built bottom end (500+ hp)
- Transmission upgrade
Notes
- 10.5:1 compression = limit boost
- Head flows excellently
- Popular build platform
Common Issues & Maintenance
TroubleshootingKnown Problem Areas
- Chain TensionerWear/failure at high miles
- Chain GuidesPlastic degradation
- Coil PacksMisfires when failing
- Thermostat HousingPlastic cracks
- VVT SolenoidOil sludge clogs
- Oil ConsumptionValve seals at high miles
Maintenance Intervals
- Oil Change5,000-7,500 mi
- Chain Inspection100,000 mi
- Spark Plugs40,000 mi
- CoolantEvery 5 years
- Transmission Fluid60,000 mi
- Brake FluidEvery 2 years
Vehicle Applications
24V VR6| Vehicle | Years | Engine Code | Notes |
|---|---|---|---|
| VW Golf Mk4 V6 | 1999-2005 | BDF, AUE | FWD or 4Motion AWD |
| VW Jetta Mk4 GLX VR6 | 1999-2005 | BDF | USA market, FWD |
| VW Bora V6 4Motion | 1999-2005 | AUE | European Jetta, AWD standard |
| Audi A3 8L V6 | 2001-2003 | BDE | European market only |
| Seat Leon V6 | 2000-2005 | AUE variant | European market |
12V vs 24V VR6 Comparison
Evolution| Specification | 12V (AAA) | 24V (BDF) |
|---|---|---|
| Valvetrain | SOHC 12-valve | DOHC 24-valve |
| Power | 174 hp | 201-204 hp |
| Torque | 245 Nm | 265-274 Nm |
| Redline | 6,500 RPM | 6,800 RPM |
| Variable Valve Timing | No | Yes (intake) |
| Timing System | Chain (simpler) | Chain (complex) |
| Complexity | Lower | Higher |
| Reliability | Excellent | Good (chain attention) |
Why 12V Remains Popular
Despite lower power output, the 12V VR6 remains popular for: simpler valvetrain (fewer failure points), stronger mid-range torque, easier maintenance, and proven reliability. For turbo builds, many prefer the 12V for its robust bottom end, lower compression, and lower parts costs.
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