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VAG 2.0 16v ABF Ressort de soupape renforcé

SUPERTECH exhaust valve stem seals Audi S4 R8 V8 4.2

€21.68 (tax incl.)

€27.10 (tax incl.) -20%

Set of 16 exhaust valve stem seals for the Audi S4 B6, B7 and R8 V8 4.2, 6 mm stem.

Brand: SUPERTECH
Engines: BHF, BYH, CNDA
Material: Viton (FKM)

Audi engines concerned

This set serves the exhaust side of two Audi 4.2 V8s with 6 mm valve stems: the 40-valve 344 hp BHF of the S4 B6 and B7, saloon, Avant and Cabriolet, from 2003 to 2009, and the 32-valve FSI V8 of the R8, BYH with 420 hp then CNDA with 430 hp, coupé and Spyder, from 2007 to 2015.

Each engine has 16 exhaust valves, two per cylinder. On the BHF, Audi fits seal 036 109 675 A, 40 pieces covering inlet and exhaust; it surrounds the guide and gives the stem only its lubricating oil.

SUPERTECH exhaust valve stem seals

On these V8s the exhaust valve is the hottest part of the head and its seal absorbs that heat. With age it hardens and then cracks: oil it no longer holds back heads for the chamber, is consumed, drops the level and leaves black carbon on the valves and inside the ports, with blue smoke as a result. A fine oil film is still needed by stem and guide.

SUPERTECH makes this exhaust seal from Viton (FKM), an elastomer for high temperatures that ages slowly against scorching exhaust valves: the maker says it can bear higher temperatures, rated at 204 °C (400 °F) continuous. It bears on a guide with an 8.8 mm outside diameter, around a 6 mm stem. The set of 16 equips a complete V8 exhaust side; for the inlet, SUPERTECH uses polyacrylate (ACM), offered in separate sets.

Stem seal technical specifications

Part number	Brand	Position	Material	Stem Ø	Guide Ø	Seal outside Ø
VS-VBM6E-16	SUPERTECH	Exhaust	Viton (FKM)	6 mm	8.8 mm	12.2 mm

Stem seal installation

Part	Original	Reinforced
Exhaust stem seal	036 109 675 A (BHF)	Replaced by this set
Inlet stem seal	036 109 675 A (BHF)	VS-VBM6I-24 (S4) / VS-VBM6I-16 (R8)
Valves		Inlet / Exhaust (R8 BYH, CNDA)

Technical guide

The brand offered

SUPERTECH, a Californian firm from San Jose, has manufactured competition valves, springs and seals for well over 30 years. New models are first computed by simulation, then tried by reputed tuners in drag racing, rallying and on race circuits.

Why two different materials?

With equal dimensions, inlet and exhaust seals on these V8s differ only in heat resistance, the exhaust valve facing the highest temperatures. SUPERTECH picks Viton (FKM) for the exhaust (VS-VBM6-E), polyacrylate (ACM) going to the inlet (VS-VBM6-I). 16 seals per V8.

When valve stem seals must be replaced

Blue smoke and oil loss on the V8
Head redone or valves taken out
Valve guides renewed
Stronger valves or springs to fit

Vehicle compatibility

Audi

Model	Engine code	Power	Years
S4 (B6)	BHF	344 hp	2003-2004
S4 Avant (B6)	BHF	344 hp	2003-2004
S4 Cabriolet (B6)	BHF	344 hp	2004-2005
S4 (B7)	BHF	344 hp	2004-2008
S4 Avant (B7)	BHF	344 hp	2004-2008
S4 Cabriolet (B7)	BHF	344 hp	2005-2009
R8 (422, 423)	BYH	420 hp	2007-2010
R8 (422, 423)	CNDA	430 hp	2010-2015
R8 Spyder (427, 429)	CNDA	430 hp	2010-2015

OEM part number (VAG exhaust stem seal): 036 109 675 A (BHF)

Important: this set does not suit the R8 5.2 FSI V10, which has 20 exhaust valves. On the inlet side, the S4 BHF and the R8 V8 take different sets (24 and 16 seals).