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Rear shock mount info(stolen from Bliaw) (archive)

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Posted by //MMMGood on February 02, 2001 at 14:16:42:

for those interested, it would appear that BMW improved their rear shock
mounts *AGAIN*.

the new one, found on all E46 convertibles (not surprisingly) as well as
the E46 M3 (only non-convertible that is factory equipped with this mount)
seems even more beefy than it's predecessors. it's still produced by Boge
and appears to be much more sturdy than previous versions.

my quick analysis of the rubber material on this rubber shows the

E46 mount: 56-58 Shore A Hardness

to give you perspective on this hardness, i also measured a JTD "blue"
bushing for their rear shock mount and it measured to a 62 Shore A
Hardness. it uses a metal "post" similar to the one bonded into the Boge
made BMW E46 rear mount. i did not have the "black" bushing to measure.

although different in design execution, the Ground Control "bushings" were
measured at a 90 Shore A Hardness. however, since these mounts do not have
a central "post" going through the bushing, thier bushing needs to be much
more stiff to do it's job.

anyhow, the part number for this mount is 33-52-6-754-096 and lists for
only $18.40 retail.

for those interested in what the new mount looks like, here's a link:

not a bad upgrade for those that need to replace them. while you're at it,
get the Z3 reinforcement plate (BMW # 51 71 8 413 359) to get a more secure
mounting to the shock tower body. if you have a rear strut tower brace,
this is not necessary as most aftermarket rear strut tower braces already
incorprate a similar plate to mount the bar.

good luck.

ben liaw

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