Reinforced exhaust valves VW Golf 3 Golf 4 New Beetle 2.0 8V

VW engines covered

The Volkswagen 2.0 8V, from the EA827 family, was fitted from the early 1990s into the 2010s to the Golf III and Vento, the Passat B3 and B4, the Corrado, then the Golf IV, Bora, New Beetle, Sharan and Polo IV. This naturally aspirated four-cylinder has only two valves per cylinder.

It therefore has 4 exhaust valves, part number 048 109 611 B: 32.9 mm head, 7.0 mm stem, 91.15 mm overall length. They are the parts that take the extra heat of a tuned engine.

SUPERTECH reinforced exhaust valves

On a naturally aspirated 2.0 8V, the head metal of the exhaust valve reaches 760 to 870 °C; a turbo or a supercharger takes it beyond 1,000 °C. The head sheds about 75 % of its heat through the seat and 20 % through the guide. The original steel, taken from the EV8 family, drops from 550 MPa at 600 °C to 300 MPa at 800 °C: past that point the head overheats, fatigues, distorts and ends up leaking at the seat.

The four SUPERTECH part numbers on this page are in black nitrided stainless steel. Nitriding hardens the valve surface and limits stem wear in its guide; SUPERTECH describes them with a stem reduced under the head and a dished head.

The VWEVI-1015-4, VWEVN-1017-4 and VWEVN-1019-4 enlarge the head by 0.5, 1 and 2 mm (33.5, 34.0 and 35.0 mm). Burnt gases leave faster, the cylinder empties better and power increases; the exhaust seats are then machined to the new size.

Exhaust valve technical specifications

SUPERTECH note: the VWEVN-1014-4 is listed as the standard size (33.00 mm); the VWEVN-1019-4 is slightly longer (91.55 mm against 90.95 mm).

Valve fitting

The original collets can be refitted if their profile matches the groove of the SUPERTECH valve: check it before assembly.

With the VWEVN-1014-4 the seats stay at the original size; heads from 33.5 to 35.0 mm require the 4 exhaust seats to be recut.

The 7 mm stem is the same as on the original valve 048 109 611 B.

Technical guide

Our brand

SUPERTECH Performance, a Californian maker of racing valves and valvetrain parts for more than thirty years, offers four head sizes in black nitrided stainless steel for the 2.0 8V, from standard size to +2 mm.

How to choose

All four part numbers share the same material: only the size remains to be chosen.

When reinforced valves become necessary

• Turbo or supercharger added
• Sportier camshaft or valve springs
• Regular track use
• Cylinder head rebuild with worn exhaust valves
• Enlarged seats for more flow

Vehicle compatibility

OEM part number (exhaust valve): 048 109 611 B

Don't forget the inlet valves

For a 2.0 8V with the cylinder head off, also think of the inlet valves and the valve stem seals.