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Old 03-23-2020, 03:58 PM   #51
jwernerny
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Quote:
Originally Posted by shoestring View Post
How about a spreadsheet for these? I love a spreadsheet.
This should work. Change the rear corner weight as appropriate, and specify the spring length and lb/in. Everything is in reference to the first one, which should be a Nivomat.

Mk I Spring Rate Calculator
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Old 04-02-2020, 04:26 PM   #52
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Some navel-gazing about stock rates here: http://forums.turbobricks.com/showth...85#post6064885
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Old 05-20-2020, 02:54 PM   #53
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https://www.f1technical.net/forum/viewtopic.php?t=6371
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Old 03-05-2021, 04:12 PM   #54
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I was able to get some spring data from our friends at Lesjofors and they gave me permission to publish it :o)


Lesjofors {part number}
{description}
---
L: {length}
OD: {outer diameter}
WD: {wire diameter}
R: {spring rate}


################


Lesjofors 4095801
240 front
---
L: 452 mm
OD: 167 mm
WD: 13.5 mm
R: 15.3 N/mm (87.4 lbf/in)


Lesjofors 4095802
240 diesel front
---
L: 485 mm
OD: 166 mm
WD: 13.5 mm
R: 17.5 N/mm (100 lbf/in)


Lesjofors 4295801
240 sedan rear
---
L: 422 mm
OD: 127 mm
WD: 12 mm
R: 17.2 N/mm (98.3 lbf/in)


Lesjofors 4295803
240 wagon rear
---
L: 407 mm
OD: 134 mm
WD: 13 mm
R: 21.1 N/mm (121 lbf/in)


Lesjofors 4295816
240 ambulance rear
---
L: 410 mm
OD: 132 mm
WD: 14 mm
R: 30.0 N/mm (171 lbf/in)


Lesjofors 4595804
240 sedan sport kit (35 mm lower)
---
R front: 29 N/mm (166 lbf/in)
R rear: 26-35 N/mm (147-200 lbf/in)


Lesjofors 4595805
240 wagon sport kit (40 mm lower)
---
R front: 29 N/mm (166 lbf/in)
R rear:23-33 N/mm (131-188 lbf/in)


The sport kits have progressive rate in the rear. I also verified that the sport kit's rear rates are lower for the wagon.
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Last edited by sloopy; 03-10-2021 at 11:40 AM..
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Old 03-05-2021, 04:39 PM   #55
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Who did you contact at Lesjofors for spring rates? That's very interesting. I wonder what they're willing to tell me for 740/940 springs.
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Old 03-05-2021, 04:43 PM   #56
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I talked to Jim at the Pennsylvania office. I can PM you his number.
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Old 03-07-2021, 03:36 PM   #57
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Quote:
Originally Posted by aharres View Post
I was able to get some spring data from our friends at Lesjofors and they gave me permission to publish it :o)
Nice!!!

Any chance you can get the 240 diesel spring rate for the front? I had a pair that were a slight lift over stock and a go of bit stiffer.
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Old 03-07-2021, 03:48 PM   #58
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Yeah I'll give him a call on Monday.

Quote:
Originally Posted by culberro View Post
Nice!!!

Any chance you can get the 240 diesel spring rate for the front? I had a pair that were a slight lift over stock and a go of bit stiffer.
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Old 03-10-2021, 11:42 AM   #59
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I updated the table with data for the 240 diesel front spring.
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Old 03-10-2021, 12:18 PM   #60
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Jim says no rates for 740/940. They're kept by the applications engineers in Sweden. Now, they do publish wire diameters, along with diameter and length, and maybe they're made from the same material as the 240 springs...
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Old 03-10-2021, 12:29 PM   #61
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The material used has almost no variation within the iron alloy family. But when measuring the spring, knowing the coating is important. Powdercoating can add a mm to the wire thickness, most paints 0.5ish mm.
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Old 03-20-2021, 02:39 PM   #62
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Quote:
Originally Posted by jwernerny View Post
From an old post I wrote in 2008 (http://forums.turbobricks.com/showpo...0&postcount=26

IPD Nivomat Delete Rear Springs:

92.5 lbs/in. Free Length: 20". Compressed Length ~8" (1100 lb load on each spring)
Can anyone confirm, that they are really that soft? I read somewhere, there were two versions (old and actual).
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