20v ur-quattro differences (long)

[David Eaton <david.eaton@computerland.co.nz>]

i got into this after being asked by a lister the difference between the
20v and a wr in the front suspension, and well, so i was bored the other
night, and i went through the complete ur-q parts fiche, and catalogued
the differences between the 20v and the 10v models.  the result is not
exhaustive, but rather comprehensive...

points of interest:

1) the 20v has a different body shell, and front floor pan (cats), with
different front l+r wheel arches
2) front and rear track control arms (wishbones) on the 20v have
changed.
3) gearbox is different, with different gears
4) oil cooler, intercooler and aux radiator are different.
5) option of a lsd for the kw (sport quattro) the "alz"
6) the use of extensive front bracing for the sport
7) the sport (kw) uses the same pistons as the wr and mb, but not the
rr.
8) reference is made to an "allum engine wr".  they're out there
somewhere folks!

my chassis is an "85-l", engine an "rr", gearbox and "avc" and diff an
"rdv"

in the detailed list below, only differences are noted (along with the
part number).

-dave
'95 rs2
'90 ur-q
----------------------------------------------------------------------
engine:

block (034 103 101 l)
head (034 103 351 h)
crankshaft (034 105 101 k)
pistons (+bearings 034 107 065 m) 
con rods (054 198 401; interestingly the kw uses the same rods as the
mb/wr)
exhaust valve (98.2mm 027 109 611 b; not the same as the kw)
inlet valve (95.5mm 027 109 601c; not the same as the kw)
inlet manifolds (034 133 201g)
exhaust manifold (034 129 591j; single piece, same shape as kw)
hydralic pump (replaces vane pump; 054 145 165 bv)
valve guides (38mm 027 103 419 as kw)
alternator (034 903 016d)
coil (443 905 105e)
distributor (034 905 205q)
starter motor (034 911 023 x/y)
wiring loom (857 971 071t)
exhaust rear box(857 253 609e)
exhaust middle box(857 253 409g)

cooling:

water pump (as kw; 034 121 004v)
radiator is unchanged
aux readiator (857 121 251 d)
intercooler (034 145 805 e)
oil cooler (034 117 021c)

gearbox:

type 016-051d.  some surprise hear to find different gears, although the
ratios are the same i think.
selectors and shift are unchanged
case (016 301 103 ar)
cover (middle case) (016 301 231 al) 
input shaft (016 311 925 f)
1st gear is unchanged
2nd gear( 016 311 265 c)
3rd gear (088 311 285 a)
4th gear (088 311 351 a)
5th gear (016 311 353 a)

suspension:

front track control arms (857 407 147/8 b)
front ball joints (857 407 365/6 f)
rear track control arms (893 505 147/8b)
rear tie rod (893 501 499a)
front and rear struts are unchanged

drivetrain:

clutch assembly (plate, relaease bearing) with mb
front diff unchanged
rear diff new (rdv - 859 525 121)

body:

body shell wtih doors! (857 800 403 g) - didn't expect this
front floor plate (857 803 061a)
transmission tunnel (857 803 067b)
seat supports (857 803 173/4
transmission tunnel re-inforcement 857 804 035
wheel housing lf (857 809 101g)
wheel housing rf (857 809 102g)
changed front gusset plates
rear floor plate - unchanged
bumpers fr/rear - unchanged