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Looking for some tii strut measurement info.....


markmac

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Working on a blog post now comparing my AlpinA CSL Racing struts with a set or AlpinA Green Dots I have.  This is what I am looking for from 

a tii strut preferably - standard strut will do since I don't believe these measurements differ from standard to tii:

 

Measurement of the the strut tube from either very bottom of strut (spindle) to where the spring perch attaches.  (Or from the top of the spindle to the underside of the spring perch)...or both.

 

Measurement from inside where the spring perch attaches to the top of the strut.

 

Diameter of the strut tube.

 

IF someone has a Bilstein Sport insert, the diameter of the damper (the chrome part, not the housing).

 

I did  a search and found some dimensions for the tii vs standard strut spindles but nothing with these measurements.  

 

Tx

 

http://www.alpinabmw2002.com

 

 

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The chrome shaft OD diameter of Bilstein P30-0025 sport strut insert for a 2002, 2002tii is 33.5mm. The P30 in the part number I believe is the valving piston diameter inside the strut. The E9 or E12 inserts begin in P36 and have a 36mm internal piston. The same goes for the rear shocks that have a part numbers that begin in B46, they have a 46mm valving piston.

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I took these measurements from the remains of a tii strut tube that I had.  115mm from the top of the tube to the base of the spring perch was rounded to the nearest 5mm because of the Mig weld covering the base of the Perch. I figured the German engineers probably work in nice round numbers.    

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Thanks Jeff, the OD diameter for both the Bilstein "Green Dot" insert as well as the AlpinA CSL/race strut insert is 39.89 mm.  The valving is just slightly different between the two though: "Green Dot"  is 150/80 .... the AlpinA race strut is valved at 440/120.  Should be a good post, need to do some photography and some editing....

 

http://www.alpinabmw2002.com

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So it is a pile of work to do this, but good to keep for my records anyway.  I only have time today for the Green Dot negative camber strut, another day for the AlpinA Race Strut.  This particular set is in sequence #3475, #3476, Part # 3131101 dated 03 '81.  Unlike a standard o2 or Tii strut, the damper threads through the bottom of the spindle (10mm fine thread rod), an appropriate size lock nut holds everything in place.  This particular set does have -1.5 degrees of negative camber, I believe the spring perch is lower as well, though I would need to see the dimensions of a Tii strut from the top of the spindle to the bottom of the spring perch to know for sure.  This is a really nice setting for a street car, not too hard/soft.  This damper has some minor damage so off to Bilstein it will go at some point to be looked at.

 

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http://www.alpinabmw2002.com

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  • 2 years later...

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