Beginner question on rear suspension

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Spiderinmlnj

Beginner question on rear suspension

Post by Spiderinmlnj »

So i'm busy sorting out my new acquisition and have a beginer question.
The clearance on driver side tire is 1 to 2 inches less than on right side.
Is this normal?

The gas tank is full so based on its placement i would expect the weight might be part or all of the cause but wondering if anything else to look at?


Thanks
Geoff
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124JOE
Posts: 3141
Joined: Fri Jun 24, 2011 7:11 pm
Your car is a: 1978 124 fiat spider sport 1800
Location: SO. WI

Re: Beginner question on rear suspension

Post by 124JOE »

bounce each corner to see if your shocks are ok or sticking
when you do everything correct people arent sure youve done anything at all (futurama)
ul1joe@yahoo.com 124joe@gmail.com
Sunracer

Re: Beginner question on rear suspension

Post by Sunracer »

It should be a little higher, the plastic spring cups at the bottom of the spring that sit on the rear end are different sizes, with the passenger side being higher than the driver's side. this is because under accelleration the force of the engine twists down on the passenger side. But it shouldn't be a couple inches. I agree about a possibly seized shock. PB
azygoustoyou

Re: Beginner question on rear suspension

Post by azygoustoyou »

Sunracer wrote:It should be a little higher, the plastic spring cups at the bottom of the spring that sit on the rear end are different sizes, with the passenger side being higher than the driver's side. this is because under accelleration the force of the engine twists down on the passenger side. But it shouldn't be a couple inches. I agree about a possibly seized shock. PB
Is that the reason one is gray and the other blue? I never noticed any thickness difference.
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manoa matt
Posts: 3442
Joined: Thu Oct 26, 2006 4:28 pm
Your car is a: 1978 Fiat 124 Spider 1800
Location: Honolulu, Hawaii

Re: Beginner question on rear suspension

Post by manoa matt »

Its more likely a spring seat is missing or the spring is not indexed to the spring seat.
Sunracer

Re: Beginner question on rear suspension

Post by Sunracer »

azygoustoyou wrote:
Sunracer wrote:It should be a little higher, the plastic spring cups at the bottom of the spring that sit on the rear end are different sizes, with the passenger side being higher than the driver's side. this is because under accelleration the force of the engine twists down on the passenger side. But it shouldn't be a couple inches. I agree about a possibly seized shock. PB
Is that the reason one is gray and the other blue? I never noticed any thickness difference.
yes, they come in a variety of colors which all have different thicknesses. Always tall on Rt, short on Lt. If you measure you will see. PB : )
Spiderinmlnj

Re: Beginner question on rear suspension

Post by Spiderinmlnj »

Shocks seem same on both sides in terms of travel.
Difference is 1 inch.

Sounds like i need to lift it up and check suspension more closely.

Thanks for suggestions

Geoff
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v6spider
Posts: 1035
Joined: Tue Feb 28, 2006 6:57 pm
Your car is a: 4.3L V6 Powered 1972 124 FIAT Spider
Location: Mount Vernon WA

Re: Beginner question on rear suspension

Post by v6spider »

The drivers side sees more weight so naturally it would wear first... I would pull the springs(marking which is passenger side and which is driver side..) an compare spring heights. They should be exactly the same. If not you may need replacement springs.

Cheers!
Rob
http://www.v6spider.com
4.3L V6 Powered 1972 124 FIAT Spider
leftfield6

Re: Beginner question on rear suspension

Post by leftfield6 »

How are you measuring? If by clearance you refer to the distance between the tire and the fender lip, that's not a super reliable measurement. You want a measurement that is not influenced by any irregularities in the tires themselves.

A more accurate measurement is to measure from the center cap of the wheel to the fender lip. That removes the tire from the equation altogether. Be sure to measure from the exact same point on both sides. For example, on my 83, which I know has a tweak in the rear quarter on the passenger side, I get these measurements:

Driver's side, dead center of the center cap to the wheel well lip: 14 1/2 inches
Passenger side, dead center of the center cap to the wheel well lip: 15 inches

Measurements taken using a 36 inch straight edge with a level for a perfectly vertical measurement.
Daniel

Re: Beginner question on rear suspension

Post by Daniel »

your dealing with an older car anything can go bad even springs can go bad and sag it might be a faulty spring .
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v6spider
Posts: 1035
Joined: Tue Feb 28, 2006 6:57 pm
Your car is a: 4.3L V6 Powered 1972 124 FIAT Spider
Location: Mount Vernon WA

Re: Beginner question on rear suspension

Post by v6spider »

Most likely a bad spring and/or shock. I would disconnect the shocks first then check ride height.. For a quick check that is... still pulling them would be best.

Rob
http://www.v6spider.com
4.3L V6 Powered 1972 124 FIAT Spider
Spiderinmlnj

Re: Beginner question on rear suspension

Post by Spiderinmlnj »

So measuring from center of wheel I get 14.5" on driver's side and 15 on the passenger side.
Based on this my first task is to replace the tires which are showing signs of dry rot in any case.
Now to find good 185/70 R13 to replace what is there now.

Thanks for all advice to date
Geoff
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