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Username Post: 47 RAG TOP--REAR END BOUNCES!!        (Topic#349963)
Broo102 
"3rd Year" Silver Supporting Member
Posts: 480
Broo102
Loc: RANCHO CUCAMONGA, CA.
Reg: 09-30-14
03-05-18 10:21 PM - Post#2726605    

My car really bounces in the rear when I hit a bump!
When I was building my car 2 years ago, I used a camaro rear end. Bought new Posie leaf springs and I think the rear shocks came with them.
I built an upper bar for the shocks to attach, but I couldn't stagger them (one on one side of the bar, one attached to the other side)
Anyone know, is that why the rear bounces so much?

Thanks!
Bru
John 3:16
32 Chev. 5 Win. Sports Coupe
47 Chev. convertible in progress


 
Rustchips 
"7th Year" Silver Supporting Member
Posts: 1114
Rustchips
Age: 81
Loc: DFW Texas
Reg: 02-24-05
03-06-18 08:02 AM - Post#2726633    
    In response to Broo102

It sounds like you need new shocks.
cleon

1928 Chevy Coupe
1942 Chevy Special Deluxe Coupe
1955 Chevy Bel Air HTP
1970 El Camino
1990 F##d Mustang Convertible

Life is like a roll of toilet paper the nearer the end the faster it goes.


 
lofat46 
2nd Year Silver Supporting Member
Posts: 230
lofat46
Loc: Bloomingdale, IL
Reg: 08-12-13
03-06-18 09:12 AM - Post#2726642    
    In response to Broo102

Broo,
Is it a bounce like worn out shocks? Step on the rear bumper and see if the how many times the car rocks before stopping. If it comes right back up and stops the shocks should be good. Perhaps you just need a softer shock. Or is it a hard bounce like possibly the springs are too stiff? If there aren't many miles on the car perhaps the springs just need t to wear a little more. Maybe a leaf has to come out.
I don't know it it makes a difference but are your shocks straight up and down or angled slightly? The Chassis Engineering kit I have in my '46 sedan has both shocks mounted on the same side of the upper shock mount/crossmember but the tops of the shocks are angled towards the center of the car I'm guessing about 30 degrees. Maybe remove the shocks or disconnect the the lower shock mounts and take the car for a short drive. This might tell you if it's stiff springs or the wrong shocks.
Tony

1946 Chevy Fleetmaster 4-door Street Rod



Edited by lofat46 on 03-06-18 09:13 AM. Reason for edit: No reason given.

 
Broo102 
"3rd Year" Silver Supporting Member
Posts: 480
Broo102
Loc: RANCHO CUCAMONGA, CA.
Reg: 09-30-14
03-06-18 09:27 PM - Post#2726704    
    In response to lofat46

Thanks Tony
The car has about 800 miles on it, the springs are those super soft design I believe. The shocks are at an angle toward the center of the car (I think Ill take a look)
I know the springs are the lowered version they sell.
If I stand on the rear bumper, it doesnt bounce up & down much; I already tried that.
The bounce i can describe is not a bottoming out type of thing its more like if I go over a speed bump, the front takes it normally, but the back "bucks" me out of my seat practically! Looks funny, cuz if it were a hard top I would hit my head!
Broo

Thanks!
Bru
John 3:16
32 Chev. 5 Win. Sports Coupe
47 Chev. convertible in progress


 
lofat46 
2nd Year Silver Supporting Member
Posts: 230
lofat46
Loc: Bloomingdale, IL
Reg: 08-12-13
03-07-18 08:17 AM - Post#2726739    
    In response to Broo102

Hmmm,another possibility is that the shock is bottoming out going over a bump because there isn't enough travel when the shock is "collapsing" while going over a bump.

1946 Chevy Fleetmaster 4-door Street Rod



 
Broo102 
"3rd Year" Silver Supporting Member
Posts: 480
Broo102
Loc: RANCHO CUCAMONGA, CA.
Reg: 09-30-14
03-07-18 11:13 PM - Post#2726825    
    In response to lofat46

you know, I never thought of that!

Thanks!
Bru
John 3:16
32 Chev. 5 Win. Sports Coupe
47 Chev. convertible in progress


 
Broo102 
"3rd Year" Silver Supporting Member
Posts: 480
Broo102
Loc: RANCHO CUCAMONGA, CA.
Reg: 09-30-14
03-08-18 09:23 AM - Post#2726869    
    In response to lofat46

Im wondering if the car is too light in the rear.
I was thinking of adding a couple of 50 lb. bags in the trunk and testing it.

Thanks!
Bru
John 3:16
32 Chev. 5 Win. Sports Coupe
47 Chev. convertible in progress


 
lofat46 
2nd Year Silver Supporting Member
Posts: 230
lofat46
Loc: Bloomingdale, IL
Reg: 08-12-13
03-08-18 12:05 PM - Post#2726898    
    In response to Broo102

Hey, it's worth a try, but you don't want to add an extra hundred pounds to the car all the time. Takes up too much trunk room.

1946 Chevy Fleetmaster 4-door Street Rod



 
Broo102 
"3rd Year" Silver Supporting Member
Posts: 480
Broo102
Loc: RANCHO CUCAMONGA, CA.
Reg: 09-30-14
03-11-18 06:20 PM - Post#2727240    
    In response to lofat46

Right, just for demo purposes

Thanks!
Bru
John 3:16
32 Chev. 5 Win. Sports Coupe
47 Chev. convertible in progress


 
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