Our special on Supertech Performance Valves & Components!
This listing is for a complete set of 20 Supertech Valves STD Size, Valve Springs, Retainers and Seat Locators for all
VW/Audi 1.8T 20V applications
This listing includes Supertech part numbers:
AIVN-1103 x 12 (intake valves)
AEVN-1103 x 8 (exhaust valves)
Head Diameter: 26.9mm (intake)
Stem Diameter: 5.96mm (intake)
5.94mm (exhaust) Valve Length: 105.09mm (intake)
Material: Black Nitrided
Type: Single Spring
Seat Pressure: 54lb @ 36.6
Open Pressure: 123lb @ 10.5
Max Lift: 13.60mm
Coil Bind: 23.00mm
Retainer: Titanium (12)
Type: Single Spring
Seat Pressure: 80lb @ 33.2
Open Pressure: 185lb @ 10.5
Max Lift: 13.70mm
Coil Bind: 19.50mm
Retainer: Titanium + SEAT-H1000 (8)
This is a hardening treatment that even though it is not widely used as the chrome coating, it has several benefits and is becoming very popular, mainly for European and Japanese applications.
The microhardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer (microhardness is 800HV Minimum).
Surface finish is smoother than with chromed stems, having less friction between stem and guide.Valve seat surface is harder with the nitrided layer, lasting longer with lead free fuels, alcohols, nitro or other \"explosive\" mixes. Matches any kind of seats (nodular iron seats, steel powder metal seats, hard aluminum-copper seats or beryllium copper seats).Higher rpm\'s engines take full advantage of all previous features. The higher the engine speed the bigger the power loss due to internal engine friction! The black nitride layer reduces this power loss due to less valve-guide friction.
The nitrided layer is adhered to the base material at a microscopic level, so does not \"flake\" or break when the valves bend due to impacts with the pistons.
The Black Nitride applies to the whole valve while the chrome coating is only applied to the stem.
All valves are swirl polished, have stem undercut and a hardened tip.
We apply more than 30 years of experience in the development of each and every Supertech racing valve we sell. Combine this experience with state of the art equipment such as ultrasonic tests, x-rays, laser measurement equipment, and applications like computerized Finite Element Analysis (FEA) and it is no wonder why supertech has some of the best performance products on the market. While this is more than most manufacturers we don’t stop there. We also do extensive testing working very closely with many of today\'s top engine builders in order to
continuously improve our products. All of this is meant to insure Supertech\'s industry leading reputation for high flow rates, durability and uncompromising quality.