Re: Leaf spring rates
[Re: astjp2]
#1227760
05/05/12 08:01 PM
05/05/12 08:01 PM
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Joined: Jan 2007
Posts: 7,664 IN
ahy
master
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master
Joined: Jan 2007
Posts: 7,664
IN
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Re: Leaf spring rates
[Re: ahy]
#1227761
05/05/12 10:53 PM
05/05/12 10:53 PM
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Joined: Jan 2005
Posts: 4,862 the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
Wow, your timing couldn't be more perfect!
I have a set ov leafs from a 69 B-wagon, and they match that description perfectly... 5 leafs (plus one half actually), pretty good arch, width, etc.
So "960" is the spring rate then? Sounds more like a load, and if so, where are the rates? I'd really like to know... i have to order matching T-bars for them this week.
More load (again, if i'm correct) than a hemi spring too, which is good for my uses. But with a thinner pack (wagon 1 5/16" vs hemi 1 5/8" & 2") they might be a lesser rate than the hemi?
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Re: Leaf spring rates
[Re: astjp2]
#1227766
05/06/12 09:01 AM
05/06/12 09:01 AM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
top fuel
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top fuel
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
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It looks like part numbers for Triangle Spring, a manufacturer. However other manufactuers may use a similar p/n system. Triangle sells through retail spring shops, eg. Jenson & Mitchell in North Jersey. As of a few years ago, Springs & Things was mail order retailer for Triangle.
edit: question answered! Thanks!
Stengel's list for a-bodies doesn't turn up the Triangle p/n for the springs I used (78-709 or the less arched version 78-609). Either its a different mfc or partial listing. It is certainly a helpful listing! For the springs that are available on-line, they also include the OEM p/n that it replaces. So with a bit of research you can cross reference to a Chrysler-Plymouth or Dodge parts book.
For example (a-body sorry I didn't copy all the other ones down when I was at the dealer). Stengel Bros p/n 78-581 replaces OEM 2808677 and 2835056. 2808-677 was for 383 equiped Darts and Barracudas 1967 - 1969. HD 383s only at least in '68-9 It used main leaf p/n 2808 688 unique to the 2808 677 spring packs. Thicker? Different Arch? I don't know but would like to find out.
Further, the DC Chassis Rally Prep chapter notes 2808-677 has a wheel rate of 130 #/inch and no increase in lift. Finally, the shop manuals indicate these cars should have 6 leaf rear springs, left and right same.
I don't have any notes on the 2835056. However by 1969, new leaf spring p/n were coming on line starting with 3004. It might be a '68 only part number.
Last edited by Mattax; 05/07/12 12:59 AM.
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Re: Leaf spring rates
[Re: TC@HP2]
#1227768
05/06/12 03:36 PM
05/06/12 03:36 PM
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Joined: Jan 2003
Posts: 27,468 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
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Posts: 27,468
So Cal
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Quote:
Abridged summation from the chassis manual;
Spring rate is the amount of force it takes to compress the leaf pack one inch.
Load rate is the amount of weight it takes to hold the leaf pack in a flat position.
Control rate is the ratio of stiffness in the front segement compared to the rear segment. 1 means the front is as stiff as the rear. Production rates range from 1 to 1.4. SS rates range 1.4 to 1.8.
So you take the Spring Capacity (Load Rating) divided by the Arch (Free Arch)???....
Ok I tried that for what I think is thier 70-72 340 heavy duty leaf spring p/n 78-611 and I get 112.78 lbs/in. That sounds about right. 340 springs were listed as 110 lbs/in in factory literature.
I think the Stengal 78-581 is the 68-69 340 leaf spring. That calcs to 106.67 lbs/in. Factory list that as a 110 lbs/in spring... Close.
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Re: Leaf spring rates
[Re: autoxcuda]
#1227769
05/07/12 12:51 AM
05/07/12 12:51 AM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
top fuel
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top fuel
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
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Quote:
I think the Stengal 78-581 is the 68-69 340 leaf spring.
Click on that p/n and the link shows the Chrysler p/n. Now you made me look at my '68 Book CD It still looks like that Chrysler number is only for some 383 equiped L, & B models 1967, 1968, 1969 1968 Standard Valiant, Dart 225cid 3004 581 Barr H T 225 3004 582 Barr Cnv, Ht Spcl 225 3004 585 Barr 318, 383 3004 588 Dart 318, 340 3004 583
Heavy Duty from the '68 Parts Book: V,L /6,273,318 3004 584 L2-S 340 3004 584 B exp 383, 3004 588 B 383,L2-S383 2808 677
My notes are that the '69 Parts Book give the following spring numbers for both the 318 & 340 cars. V,L,B 3004 584 Presumbly this is the spring used in '68 340 equiped Barracudas. I don't have supplementals for books.
To confuse things a bit, from the Chassis Manual, Ralley Prep, page 58: 340 H.P. 3549 059 110 lb/in 0" increase
Looking at the part parts books on Cd helps correct my notes, correction made in previous post regarding applications.
Last edited by Mattax; 05/07/12 12:55 AM.
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Re: Leaf spring rates
[Re: PlumCrazyChris]
#1227772
12/18/12 04:47 PM
12/18/12 04:47 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,442
NW Chicago suburban area
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And... to the list for 41" B and E-bodies, the 1.24" dia TB can be added at 425 lbs/in (I run these in my autocross T/A)... along with 225 lbs/in fiberglass mono-leafs having an uncompressd 5" arch (leaving about 1.5" uncompressed arch in race-trim).
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: Leaf spring rates
[Re: Mopar Mitch]
#1227773
07/09/13 07:21 PM
07/09/13 07:21 PM
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Joined: Jan 2003
Posts: 43,544 Round Lake Beach, Illinoisy
Rhinodart
Rhinotruck
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Rhinotruck
Joined: Jan 2003
Posts: 43,544
Round Lake Beach, Illinoisy
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Digging up an old thread. I found that the numbers on my 68 Dart GSS 440 car are 2835056 and I found a set of springs in my stash that have the number 2835064 that look identical, does anyone know what these springs fit?
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
JB Rhinehart, Realist
A-Body's RULE!
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