Posted by Janicholson on June 20, 2012 at 06:34:16 from (199.17.6.26):
In Reply to: Re: M valve springs posted by Johninmn on June 19, 2012 at 14:33:53:
a spring testing setup and a caliper are needed. Free length, installed length, compressed length, and pounds of pressure at installed length and compressed length are valuse of importance. Assuming the spring is selected for the inner and outer diameter match to your retainers and guide extension, (assumes a PC style valve guide seal as well). The free length is probably least important if close to original. That is the length in your hand. Be sure to measure the straightness, and parallelness of the end windings to assure uniform tension. The installed height is the distance from the block to the under side of the retainer. (measured) this is important due to the fact that the spring needs to hold that valve firmly against the seat when closed. Be sure the pressure is at or a bit higher than stock, but not dramatically. Compressed height is the head to underside of the retainer distance when the cam is at max "lift". This has the spring compressed to its working tension. This is where the 30% factor is important. Pressure readings here should be that much higher than the stock springs. Coil bind is the compressing of the spring such that the coils touch each other from being compressed too far. If this is the case, you will break the spring, or components of the valve train from non compressible metal where a spring should be. Variable pitch springs are common. They have coils that change distance from one to the next. This helps the spring avoid high frequency harmonic vibration, above 5000 RPM. Not much importance here. The flat second spring is also primarily a vibration dampener. It is wound to rub against the inside of the coils to dampen harmonics, like a finger touching a tuning fork. Best of luck, I hope this is enough. Jim
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