Dual Valve Spring sets consist of an innerspring and an outer spring per valve.
These springs are rated at 200 pounds pressure compared to a standard production spring of around 80 – 90 pounds pressure.
These springs are rated at 200 pounds pressure compared to a standard production spring of around 80 – 90 pounds pressure.
There are various modifications to ensure the correct fitment of these springs the main factor is to ensure that the customer is aware of the following:
Chromoly 4140 is a lightweight hardened steel.
This retainer is suitable for VW 7mm stems with 3 cotter grooves.
Use with standard 3-groove cotter.
- A 1mm spacer needs to be placed under the spring to avoid damage to the seating area.
- Stainless Steel Billet valves must be used otherwise the force of the valves closing will pull the head off a standard two-piece valve.
- Spring Travel & Spring pressures are crucial and will differ depending on the lift, duration and rpm range.
- The Spring sets are designed for up to 9000rpm, however we have clients revving close to 10 000rpm with reliability.
- STK Cam Buckets or similar should be used, the standard production Camfollowers are not strong enough to handle this spring kit.
Chromoly 4140 is a lightweight hardened steel.
This retainer is suitable for VW 7mm stems with 3 cotter grooves.
Use with standard 3-groove cotter.
