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Author Topic:   Compressed Spring height
twleach2
Dirt Full Roller

Total posts: 44
posted March 27, 2002 09:00 AM
Does anybody know what height the front coil springs are in a stock metric frame (83 Monte to be exact)? I am trying to decide which front springs to buy and at what rate. I got all the information for the stock springs, but I am not sure how to match this information up with a set of 12" or 9.5" racing springs. Any help would be greatly appreciated.

SLEEPY GOMEZ
Dirt Maniac

Total posts: 199
posted March 27, 2002 10:27 PM
The front springs of an 83 Monte Carlo are as follows:
without air, rate 346, loaded height 11" free height 15.157"
with air, rate 346, loaded height 11" free height 15.387"
spring I.D. 4.080, wire dia. .672"

Hope this helps, SLEEPY

twleach2
Dirt Full Roller

Total posts: 44
posted March 28, 2002 12:47 PM
Sleepy, I know you used 9.5 inch racing springs in your IMCA project car, but should I use 9.5 inch (height) racing springs or should I use 12 inch (height) racing springs. I am not allowed to use j-screws to adjust the ride height. If I use 9.5 height, I will be loosing 1.5 inches of spring height. I read an article that you wrote (Oct 2000, SCR) that said that you wanted as much travel as you can get without having the suspension bottom out. If I base my decision on what I have read, then I want to use 12" springs. Am I correct?

SLEEPY GOMEZ
Dirt Maniac

Total posts: 199
posted March 30, 2002 10:25 AM
Hi twleach2, use the 12" springs if you don't have weight jacks. The frame height needs to be in the range of 6 1/2" to 7". Measure this at each end of the side rail at the point where it welds to the stamped part of the frame. This is for the metric frame, others I'm not sure of the measurement.

With the frame blocked to this height and the front spring removed and the tire still on, there should be at minimum of 3" of upward (bump) travel before the a-frasmes touch the chassis. I found if therre is more than 3 1/2" the roll center gets to high. Hope this helps, SLEEPY

twleach2
Dirt Full Roller

Total posts: 44
posted April 01, 2002 11:17 AM
Thanks Sleepy, I will give this a try.

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