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Torsion Bar Dimensions
I'm trying to calculate the spring rates for the different early (Pre G50) 911 T-Bars. Does anyone have any near by from which they could take a couple of measurements for me?
What is the "working length" (excluding the fluting) for a front and a rear T-bar? The math is pretty straight forward and I'd be happy to post the results after I figure them out. Thanks! 
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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06-07-2002, 07:22 AM
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I have a spring plate angle calculator on my site - http://vintagebus.com/cgi-bin/spring.cgi - plug in your t-bar size and weight, and whammo, out comes the spring plate angle. Set your unladen spring plate to that angle using a protractor, and you're good to go.
The math credit goes to Will Ferch - I just did the programming and hard-coded the trig tables. Here's the t-bar data: mm:lbs 23:100 24:120 24.1:122 25:140 26:165 27:191 28:221 29:254 30:291 31:332 32:377 33:427
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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06-07-2002, 07:51 AM
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Screen Shots
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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06-07-2002, 07:55 AM
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Thanks Tom!
Now how about the front bars????
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman Last edited by jluetjen; 06-07-2002 at 11:05 AM.. |
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06-07-2002, 10:56 AM
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Maybe Will has some data on them - I don't.
 Quote:
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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06-07-2002, 11:16 AM
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Duh! I'm sorry Thom!
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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06-08-2002, 04:34 AM
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Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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Guys:
Sorry for the late response: Front torsin bars, ....given first in mm diameter..then lbs/in rate 18.8 = 110 21 = 173 22 = 210 23 = 250 24 = 296 25 = 350 Don't know if sizes greater than 23 are even available. --Wil Ferch
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08-21-2002, 07:59 AM
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1969 Porsche 911E 2.0 E
