My Crown Vic's springs, or maybe some other suspension parts, make kind of a crunchy noise on cold mornings when I go over bumps. It doesn't do it when it's warmer than about 40 degrees. Is this normal or indicative of a problem?

11/10/2008 4:19:51 PM

sounds like the Motorcraft shock heaters are going out

11/10/2008 4:22:17 PM

did you replace your blinker fluid with a lower viscosity for cold weather?

11/10/2008 4:56:03 PM

totally the NGR valve

you have one that has a higher temp range than you need for raleigh

should get it changed asap to avoid costly suspension damage

11/10/2008 5:58:02 PM

i totally did a project on this in vibrations class

you'll need a spring stiffness around 100 kN/m and a damping coefficient of about 50 kn-s/m

what is the car's mass? what kinda sine wave do you ride on most often?

11/10/2008 6:52:36 PM

^lol

11/10/2008 7:20:14 PM

NRR, ftw

11/10/2008 7:47:44 PM

Quote :

"you'll need a spring stiffness around 100 kN/m and a damping coefficient of about 50 kn-s/m kn-m/s"

n00b. fixed it for you


as an interesting aside, the military qualifies ride quality as the vertical accelerations incurred on the driver at ~4.5Hz.

[Edited on November 10, 2008 at 9:42 PM. Reason : .]

11/10/2008 9:39:40 PM

^i had the units right:

F=-c*v

F [=] kN

v [=] m/s

therefore: c [=] kN-s/m

i suggest you refresh yourself in vibrations, noob

11/12/2008 10:04:10 PM

you should inspect your pittman-arm for wear damage

11/13/2008 1:07:09 AM

Crunchy noise like creaky/crunchy? Or crunchy with no creak? Front, rear, left, right, or all of them?

11/13/2008 10:43:41 AM