BMW N54/N55/S55 Turbo Conical Spring Kit – Set of 24 by Supertech

Supertech Spring / Retainer kits are precision matched sets for a complete valvetrain overhaul. Developed for the performance enthusiast that wants the best the industry has to offer, Supertech Spring / Retainer kits are second to none in terms of performance, quality and value.

Features

• InnSpr.OD: 21mm
• InnSpr.ID: 14.2mm
• Seat Pressure: 75 @ 36.5
• Open Pressure: 155 @ 10
• Max Lift: 12mm
• Coil Bind: 23.2mm
• Rate: 8
• Kit spring: SPR-FE20BE
• Retainer: RET-BMN54-TI (5mm) / RET-BMN54-TE (6mm)
• OutSpr.OD: 24.4mm
• OutSpr.ID: 17.6mm

Benefits

• Underwent a gas nitriding process before shot peening for improved fatigue life

Please Note: Use Factory Valve Stem Seal

Applications

• 2007-2010 BMW 135i
• 2006-2010 BMW 335i
• 2011-2013 BMW 335is
• 2007-2010 BMW 535i
• 2008-2012 BMW 740i
• 2008-2010 BMW X6
• 2009-2016 BMW Z4

What’s In The Box?

• 24 – Springs
• 24 – Retainers

Warranty

• Due to the nature of the application, these parts are sold without any express warranty or any implied warranty of merchantability, or fitness for a particular purpose.