Valve springs
Posted: Thu Nov 02, 2006 8:02 pm
I have a set of new shankle valve springs for a 4 cyl. purchased a few years ago.
I know this subject was about earlier.
These springs have a foil damper in between the inner and outer coils. It is advised this damper be removed before installing the spring set.
My concern is having the inner and outer springs wound in the same direction which is not correct.
After contacting various spring suppliers they advise having the springs both wound in the same direction is very wrong. There is the danger that if either of the springs break there is a good chance it can fall inside the other coil making it become solid creating engine damage. The chances of spring breakage increases with higher spring loads and high lift camshafts.
What interested me was that most spring suppliers have springs for various makes of engines in that the inner spring O.D. dimmension is the same as the outer spring I.D. making a slight contact. I was told this cancels or reduces spring oscillations.
Has anyone have any experience with this style of springs for the alfa engines?
I know this subject was about earlier.
These springs have a foil damper in between the inner and outer coils. It is advised this damper be removed before installing the spring set.
My concern is having the inner and outer springs wound in the same direction which is not correct.
After contacting various spring suppliers they advise having the springs both wound in the same direction is very wrong. There is the danger that if either of the springs break there is a good chance it can fall inside the other coil making it become solid creating engine damage. The chances of spring breakage increases with higher spring loads and high lift camshafts.
What interested me was that most spring suppliers have springs for various makes of engines in that the inner spring O.D. dimmension is the same as the outer spring I.D. making a slight contact. I was told this cancels or reduces spring oscillations.
Has anyone have any experience with this style of springs for the alfa engines?