In a message dated 7/1/2010 8:56:32 P.M. Eastern Daylight Time,
scottdaniel@turbovans.com writes:

the  cranks are different between 1.9 and 2.1 since the only real
difference
is  stroke...
they both take the same pistons and barrels..
it's the longer  stroke that makes it a 2.1

on bare cranks ....don't know if there's a  part # or ...could measure
stoke
..

Hey Scott  I have 2 sets of pistons here.  one has a dome top and  the
other a flat top , the wrist pin holes are different.  1.9L  P&Ls  #  025 198
075      2.1L  P&L#  025 198 075D      how can they be the  same when they are
different physical and part #  ??    Now  I have 2 cranks setting in front
of me  one is out of a 2.1(Main bearings  are different in how they lock
into place) other is out of a 1.9L   No  part # and they look the same.  Dealer
gives a different part #  025  105 101A  1.9L  and 025 105 101B  for 2.1 L
all the  journels measure the same , laying a stright edge down the center
and the  strokes measure the same.  It is my thinking that the size
difference  between 1.9 and 2.1 is from the differences in the piston height and the
stock  compbustion chambers between the heads.  Bentley only shows that
they are  color coded but there is no color dots on either of these cranks . I
have been  working on these guys a long time and can tell an aircooled crank
apart just by  looking at it. but I can not see any differences in the WBX
cranks    later  mark d