A few things Jerry, They will give you 1" lower ride height if you want it, the spring acts faster because its running on roller bearings, it allows more rise before it runs out of travel than a shackle will, and there is no side to side sway which is very handy when cornering with tight tyre clearances. The only downside other than the cost and the hassle of fitting them, is they do tend to rattle a bit on the street.
Most of the suspension movement is at the rear - especially with Split Mono's and Caltracs which effectively lok the front portion of the spring solid so it acts like a Ladder bar. You need that movement which is in an arc normally, hence the use of shackles.
autofetish wrote:Why do we have spring hangers and just not bolt then solid to the car like the front bush is ???
What Pete said, and just to spell it out, the reason for the movement is that the spring changes length as it compresses (it gets longer), or unloads (it gets shorter). If there were no shackle, or slider, you'd have no suspension as the spring couldn't compress....
Gavin Chisholm - 414ci W2 Stroker SmallBlock Panther Pink '71 Challenger convertible - in bits Car progress can be viewed here
Bit of a mock up to look at mounting the shocks upright. First job was to get Trev to turn up some plastic bushes with a steel insert for the top eyes.
