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 the EA827 2.0 8V, which breathes without a turbo, each exhaust valve head works between 760 and 870 °C, and climbs above 1,000 °C the moment a turbo or supercharger gets grafted on. The seat dissipates about 75 % of the heat, the guide 20 %. Compared with the EV8 family, the original steel offers 550 MPa at 600 °C and only 300 MPa at 800 °C; beyond that, the head tires, warps and lets the gases escape.

The four SUPERTECH valves offered here are in black nitrided stainless steel: the treatment hardens the surface and makes it smoother, which slows stem wear against the guide. Their head is concave and their stem narrows just below the head.

Three of them enlarge the head: VWEVI-1015-4 to 33.5 mm (+0.5 mm), VWEVN-1017-4 to 34.0 mm (+1 mm), VWEVN-1019-4 to 35.0 mm (+2 mm). Burnt gases exit the cylinder more easily, fresh air enters more freely and power benefits; the 4 exhaust valve seats then have to be recut to the new size.

Exhaust valve technical specifications

Valve fitting

These 3-groove valves are fitted with KPR-VW7-T collets.

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 Silicon Valley firm, has devoted three decades and more to racing valves, plus the springs, guides and titanium parts around them. Stainless steel, titanium, Inconel: the valve is engineered for one precise engine, then dialled in with drag strip, rally and circuit tuners.

How to choose

All these valves share black nitrided stainless steel, the 7 mm stem and the 3 grooves that take the KPR-VW7-T collets. So only the head diameter remains to be chosen, according to seat condition and the desired flow:

When reinforced valves become necessary

• Turbo or supercharger added to the 2.0 8V
• Sharper camshaft, uprated valve springs
• Regular track days, autotests or hill climb events
• Rebuild of a cylinder head with marked exhaust valves
• Seats enlarged to give more exhaust flow

Vehicle compatibility

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

Don't forget the inlet valves

When the 2.0 8V cylinder head comes off, it pays to put new inlet valves in this engine during the same job. The matching reference is shown below: