This is primarily about the use of OE upper spring discs (aka upper spring perches), P/N suffix 111B and 113 (1st two photos below and item 29 in 3rd shot) but also asks about the cup spacer (item 28), and involves consideration of the strut, front or rear, and of course the particular spring one wants to hold captive.
Questions:
a) I'll begin by asking if as examples, a 1985 quattro and/or the S2 3B/ABY w/AC springs (last shot below) left the factory with the shorter type 111B discs (always found on just the rear struts of 7A coupes and sedans in North America) atop their front springs, as there is at least some unofficial written evidence such was the case (see 3rd and 4th screen-shots).
b) It may be that wherever the type 113 was used, it was accompanied by cup spacer item 28 underneath but never under the type 111B? IIRC, this convex-topped washer is about 3mm thick, but perhaps counter-intuitively, because it is not in the vertical weight-bearing load path of an installed strut, its' presence or absence does not alter the effective height of the strut. What purpose do you suppose it might serve?
c) No doubt some folks here have tried 111B types in place of their taller 113 types on the front struts. If yes, can you please comment on any perhaps basic fitment issues, and might you know of any combinations (with particular springs) which during use, may not sufficiently restrain the installed spring in situ under all conditions, if any. I ask as the front and rear struts lower perches are at slightly different heights on the struts (the rear struts lower perch being higher up), and the effective heights of various OE springs vary. So for instance, swapping the 7A's tall front top perches (113's) for shorter 111B rears, onto the front struts might result in a spring (particularly a short spring) that could get loose on full droop (I have not tested this)?
d) Although I have no personal interest to lower the front or raise the rear ride heights of mine, but depending your answers, some may want to use or avoid some of the possible combinations?
For those who might be interested, what I did do with all my perches was (very tediously, due to the odd and non-flat shapes), carve some plastic isolator plates to separate the spring from both the upper and lower perches. I didn't like the metal to metal squirming at the lowest coil to lower perch contact area of the stock install and occasional 'twang' that occurs while getting underway, and these plates also helped to negate that my springs are slightly shorter than stock.
Spring disc upper 893 412 111B Screen Shot 2021-06-04 at 23.24.50.png Spring disc upper 893 412 113 Screen Shot 2021-06-04 at 23.26.07.png S2 front strut parts 7Zap Screen Shot 2021-06-04 at 23.06.51.png items 28 cup spacer and 29 spring disc Screen Shot 2021-06-04 at 23.12.03.png item 19 S2 3b ABY AC springs Screen Shot 2021-06-04 at 23.10.49.png
Questions:
a) I'll begin by asking if as examples, a 1985 quattro and/or the S2 3B/ABY w/AC springs (last shot below) left the factory with the shorter type 111B discs (always found on just the rear struts of 7A coupes and sedans in North America) atop their front springs, as there is at least some unofficial written evidence such was the case (see 3rd and 4th screen-shots).
b) It may be that wherever the type 113 was used, it was accompanied by cup spacer item 28 underneath but never under the type 111B? IIRC, this convex-topped washer is about 3mm thick, but perhaps counter-intuitively, because it is not in the vertical weight-bearing load path of an installed strut, its' presence or absence does not alter the effective height of the strut. What purpose do you suppose it might serve?
c) No doubt some folks here have tried 111B types in place of their taller 113 types on the front struts. If yes, can you please comment on any perhaps basic fitment issues, and might you know of any combinations (with particular springs) which during use, may not sufficiently restrain the installed spring in situ under all conditions, if any. I ask as the front and rear struts lower perches are at slightly different heights on the struts (the rear struts lower perch being higher up), and the effective heights of various OE springs vary. So for instance, swapping the 7A's tall front top perches (113's) for shorter 111B rears, onto the front struts might result in a spring (particularly a short spring) that could get loose on full droop (I have not tested this)?
d) Although I have no personal interest to lower the front or raise the rear ride heights of mine, but depending your answers, some may want to use or avoid some of the possible combinations?
For those who might be interested, what I did do with all my perches was (very tediously, due to the odd and non-flat shapes), carve some plastic isolator plates to separate the spring from both the upper and lower perches. I didn't like the metal to metal squirming at the lowest coil to lower perch contact area of the stock install and occasional 'twang' that occurs while getting underway, and these plates also helped to negate that my springs are slightly shorter than stock.
Spring disc upper 893 412 111B Screen Shot 2021-06-04 at 23.24.50.png Spring disc upper 893 412 113 Screen Shot 2021-06-04 at 23.26.07.png S2 front strut parts 7Zap Screen Shot 2021-06-04 at 23.06.51.png items 28 cup spacer and 29 spring disc Screen Shot 2021-06-04 at 23.12.03.png item 19 S2 3b ABY AC springs Screen Shot 2021-06-04 at 23.10.49.png
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