The Evolution of Volkswagen's V5 and V6 Engines

Volkswagen released a new V6 engine in 1999; a development of the VR6. The main change is the adoption of a 4-valve cylinder head with valves operated by two camshafts, the inner pair operated by the camshaft of the opposite bank.

A variable induction system enhances low-speed torque, improves fuel consumption and helps with emission control.

V6 head cross-section showing cross-bank valve actuation
V6/4-valve head cross-section showing cross-bank valve actuation.
Volkswagen's new V5 is similar.

Volkswagen's older V5 was based on the original VR6 engine with 2 valves/cylinder. Either V5 is basically the V6 with one cylinder lopped off at the chain-drive end, resulting in 3 cylinders in the front bank and 2 cylinders in the rear bank for transverse installations. Other changes include a different crankshaft for balanced operation and the addition of a variable-geometry intake manifold with the original V5. The new V6 is equipped with a variable-geometry intake manifold. (See below).

The revised V5, based on the current V6 was introduced in 2000, producing almost as much power (125kW compared to 128kW) and more, wider torque than the old VR6.

V6 engine cut-away model
V6 engine cut-away model

V5 (110kW) in Golf engine bay
V5 (110kW) in Golf
V5 (125kW) in New Beetle
V5 (125kW) in New Beetle
V6 in Golf engine bay
V6 in Golf
V6/4-valve head showing valves V6/4-valve head showing camshafts
V6/4-valve head showing valves V6/4-valve head showing camshafts

Comparison of V5 and V6 Engines
Engine V5 110kW V5 125kW V6 150kW
Material cylinder head
engine block
Gray cast iron casting
Bore/Stroke [mm] 81.0 / 90.2
Effective displacement [cm³] 2324 2324 2792
Valves per cylinder
2 parallel
direct bucket-follower
4 at an angle/indirect,
roller cam followers
Number of camshafts
Drive configuration
2 at the top of the cyl. head
with chain
Crankshaft throw in degrees 144 120
Number of crankshaft bearings 6 7
Compression [:1] 10.1 10.8 10.75
Mixture preparation Electronic multi-point port injection
Ignition system Mapped characteristic Mapped
single spark coils
Emission control system catalytic converter, lambda control
Power output [kW (bhp) at rpm] 110 (150) / 6000 125 (170) / 6200 150 (204) / 6200
Max. torque [Nm at rpm] 205/ 3200 220/ 3300 265/ 4000
Alternator (A)/battery (A) (Ah) 70 / 280 (60) - / - (60) 120 / 340 (70)
Exhaust emission classification D3 Euro IV

V5 Torque/Power Curves V6 Torque/Power Curves

Source: Volkswagen AG, Germany