SOME 4AG valve spring specs

[oldeskewltoy]

(05-02-2015 10:47 AM)Project D Wrote:  For Supertech:

-SPR-TC25S (single):

• 55lbs (244.5N) @ 35.40mm (with supertech retainer)
• 21.00mm Coil Bind
• 7.60lbs/mm (33.8N/mm)
  

So they are 14.4mm of lift @ bind using Supertech retainers? (35.4 minus 21)

Additionally... aftermarket retainers can offer some lift advantages... but we begin to mix up specs by mixing in none stock retainers. The Supertech springs under a stock retainer would be 34.7mm and bind is @ 21, so the Supertech springs under a stock retainer allows 13.7mm of lift before bind. What does Supertech recommend for maximum valve lift? (Do they abide by .050", or do they have less gap between bind and max lift like the Toda springs are alleged?

Other methods of gaining some lift is to machine the spring pocket, this will lower the spring and accommodate more lift. At some point spring bind falls away and the next clearance issue is the .060" that is recommended between the retainer, and the seal @ full lift. Again SOME room can be gained here by machining the top of the guide a few thousandths