Suspension Guys!!! Help

[ollucky]

Just installed Del A Lum Bushings, and Landrum 180 lb front springs on a 69 Camaro. The front end weighs 1667 lbs.

Problem: car sits up with the front end fully extended...if i under stand spring rate correctly it takes 180 lbs to compress the spring 1 inch. If so each front wheel has 833 lbs of weight divided by 180 lbs of spring so it should come down 4.63 inches?

Please Help
Mark

[ollucky]

New Spring is about 4 inches taller the stock spring that came out of it. Does anyone know spring rate of a factory 69 camaro?

[VicR]

Spring rate is 280 lbs per inch. Information can be found online at Gm archive- 69 camaro- page 21 (actual page number)or 89 online page number. Notice different at wheel numbers - 6 cylinder vs v-8

[L79racer]

I just put Landrom 16" tall 200 lb springs in front of my 66 Vette. It compressed them down to 10 3/4" so, 5 1/4 times 200 is 1050lbs. I say your suspension is bound or springs arent into pockets correctly.

Just wanted to add, you should check the ride height of the shocks after you get the springs figured out so you know how much compression and extension you have for your shocks.
Set the car on the ground with no shocks in and measure the shock mounting points.

[Bob Mulry]

I don't want to get techie, but...............

If you look at your lower control arm the spring is located approximately mid-way between the ball joint and the control arm inner pivot point.

This means that the force applied to the ball joint, will apply approximately 100% more force to the spring because of the reverse mechanical advantage of the ball joint / spring location..

Spring rate does not tell the full story of ride height changes....

So if your front weights 1500 lbs., each wheel has 750 lbs. weight at the lower ball joint. With a ratio of 2 to 1 a 150 lb. spring rate would be compressed about 10" and a 200 lb. spring would be compressed about 7.5" and a 300 lb. spring about 5"...

Just my 2 cents..

Bob

[Marty Rinehart Jr]

Originally Posted by ollucky

Just installed Del A Lum Bushings, and Landrum 180 lb front springs on a 69 Camaro. The front end weighs 1667 lbs.

Problem: car sits up with the front end fully extended...if i under stand spring rate correctly it takes 180 lbs to compress the spring 1 inch. If so each front wheel has 833 lbs of weight divided by 180 lbs of spring so it should come down 4.63 inches?

Please Help
Mark

Mark
We use Del A Lum Bushings and Santhuff / Landrum springs on our cars exclusively. If you are still having these issues, please call us at Rineharts Performance 717-793-6819 , and we will do our best to get your problem sorted out.