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Date:         Sat, 3 Jul 1999 10:19:30 -0700
Reply-To:     "Steven X. Schwenk" <Steve@SCHWENK-LAW.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         "Steven X. Schwenk" <Steve@SCHWENK-LAW.COM>
Subject:      Re: SA HD Spring Rates
Comments: To: "James S. Cohen" <jscohen@sprynet.com>
Content-Type: text/plain; charset=us-ascii

The stock syncro springs are 450 lb/inch. My notes say 785 lbs./inch for the rears, but i think this is wrong. I will talking to the Betts engineer tuesday and will confirm then and get the length.

"James S. Cohen" wrote:

> All, > > I got the SA Heavy Duty springs measured today. The fronts were 500lbs/in., > and the rears were 280lbs/in. > > I did not get a chance to remove the stock springs from one of my "herd" of > Vans, so I don't know how much stiffer these really are. > > I'm somewhat skeptical of the device this guy used to measure the rate > however. It was VERY old, and beaten up. I have NO idea if he ever > calibrates it. > > It's probably accurate for springs tested on IT. I dont' know if it has > relevance to springs tested on another tester somewhere else in the country. > > I'll take the stock springs off and get them tested next week. > > Also, my book on chassis engineering clearly states that the springs ONLY > support the weight of the body, and the weight of the chassis is > irrelevent. Therefore, the extra weight of the syncros is not borne by the > springs since it's on the chassis. > > So, it would seem, that syncros don't need spring rates any higher than a > 2wd although they may need LONGER springs. > > If anyone disagrees with this, feel free to open a thread to debate it! > > I'm NOT an expert on springs, I have read books, and have experience with > my GTis and Corrado. So, if there ARE any experts, let's hear from them. > > Meanwhile, I'll consult some of the racers on my other lists, and see what > they say... (of course, this is all rather moot since there are only a few > springs even available for the Vanagons) ;) > > James


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