Although dedicated to the VW Engine the STK Dual Valve Spring Kit can be used on the following engine types :
VW 8v , 16v , VR6 , Audi 5 Cylinder 20v & 10v , Combi 2.3/2.5/2.6
Uprated Valve Springs and Retainers ( REV Kit ) are a must if you are considering a Camshaft with High Lift and intend to run at Higher Rpm.
The STK Dual Valve Spring Kit is a Competition Kit which will eliminate coil bind and valve float when installed correctly. The STK Dual Valve Spring is made from High Quality Chrome Silicone Materials and is rated 9000rpm and suitable up to 13.5mm of Camshaft Lift.
The STK Rev Kit ( Dual Valve Spring Kit ) is used Worldwide from street , Drags , race track etc with great success and reliability.
STK Dual Valve Spring Kits are must for Turbo , Super Charger and/or Nitrous Oxide applications as they will keep the valves closed at the correct times as the standard valve springs are too soft for this type of setup.
A standard VW valve spring is rated at around 80lbs of pressure where the STK Dual Valve Spring is rated at around 185lbs of pressure.
The STK Dual Valve Spring Kit is Complimented with the STK Chromoly 4140 Valve Spring Retainer ( Suitable for 3 groove cotters for 7mm valve train ) and the STK Lower Spring Retainer ( the STK Lower Valve Spring Retainer is used in place of the Standard Production part and there is no need to use a 1mm spacer when fitting the STK Lower Valve Spring Retainer ) http://stk.co.za/technical/valve-spring-travel
Installation of the STK REV KIT ( see below link )
1. The Spring Heights and Spring Travel need to be Measured & Adjusted accurately to avoid coil bind ,breakage or damage to the camshaft lobes.
2. Allow an Automotive Engineering Specialist or a Master Mechanic to install these springs correctly , if you get it wrong it's gonna hurt your pocket !
3. STK Dual Valve Spring kits are not a DIY Kit and we strongly recommend that a Master Mechanic installs this product kit.
Valve Spring Break-in Procedures
- Ensure correct Spring Pressures, Spring Travel, Spring Height & Clearances.
- On Initial Start-up limit between 1500 & 2000 Rpm until operating temperatures are achieved.
- Shut-off engine and allow to cool to room temperature.
This break-in period will reduce the risk of Valve Spring failure and prolong the life of your Valve Springs.
Modification of the Cylinder Head maybe necessary in order to ensure reliability when fitting the STK Dual Valve Spring Kit , so ensure that a Master Mechanic fits these products to avoid damage to the camshafts, valve train and engine.
What Valve Spring is right for your application ?
Keep in mind that Motorsport Companies do not use standard valve springs in their “state of the art“ Cylinder Heads as the standard valve spring is designed for a production vehicle which is generally well looked after at a moderate rpm , low lift and low duration Camshafts.
Whereas a competition engine is designed to run at maximum rpm whether it be 8 000rpm or 10 000rpm , they need reliability and components that can handle the pounding from the high lift, high duration Camshaft.
With this in mind a Cylinder Head or Engine will be destroyed due to incorrect installation or incorrect valve spring applications due to valve float and coil bind.
So, when you decide to build a trick head ensure you do your homework thoroughly and get expert advice.... as going cheap on the Valve Springs will result in a hefty repair bill.