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  1. #1
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    Member No: 19016 JBlack is an unknown quantity at this point JBlack's Avatar
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    Yes | No

    RSM Legality

    I have a question on the legality of RSM (Rear Shock Mounts). This question is for an E30, but I assume it would apply to all E30/36/46 and Z cars, as their RSMs are pretty interchangeable.

    This is assuming BMWCCA Stock Class rules

    I know "Suspension bushing material is free", and "For those cars that can accept them,....sold rear upper shock mounts are allowed" but I know there was a rule clarification that stated that "Suspension bushing material is free. The definition of bushing material does not include replacement of bushings with spherical bearings or rod ends generically known as hiem ends. Solid bushings are allowed as long as they are fixed in place and allow rotation only on a single plane or axis. The only exception would be sway bar link connectors which are free".

    OK...knowing that - what is legal in stock class - TC Kline, Ground Control and Turner all sell 2 "lines" of RSMs - a race one with a spherical bearing, or a street one with rubber/polyurethane components. Which can I go with and stay legal?

    Thanks guys!


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    No monoballs. Period. This is one of the many

    reasons I went to Prep. My car eats Rear LCA bushings for breakfast.

    This info came from Jim Flukey a while back.<p align="center"><a href="http://www.doubledracing.net">
    <img border="0" src="http://members.roadfly.com/txse46m3/hotsauce_scornedwoman.jpg"></a></p>

    DoubleD Racing
    Mod List: Buncha stuff that makes it sound like a barrel of washers rolling down the street.

  3. #3
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    You're going to love this...

    Look at my identical post on Bimmer Forums. I guess over there it is legal (wink wink). If Monoball is illegal (as I belive you are correct), what the hell is a legal "solid rear shock mount"?

  4. #4
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    Can be immoble, I suppose. Best bet is

    urethane.

    Same email I posted at BF...

    <b>Dave,
    Bushings and bearings are two separate and distinct things. Spherical bearings (hiems) are not bushings. A bushing rotates only in one axis with some slight possible deflection in a compliant material whereas a monoball or spherical bearing can rotate in more than one axis and is ridged. The only place a spherical type bearing can be used is on the sway bar ends. On a more positive note you can open up or enlarge to accommodate the adjuster as long as it is the only reason. I am the online source along with the rules committee.
    Jim Fluckey
    National Tech steward
    </b><p align="center"><a href="http://www.doubledracing.net">
    <img border="0" src="http://members.roadfly.com/txse46m3/hotsauce_scornedwoman.jpg"></a></p>

    DoubleD Racing
    Mod List: Buncha stuff that makes it sound like a barrel of washers rolling down the street.

  5. #5
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    Thanks!

    I guess I'll go with GC's non-race RSM in the "more stiff" position. I would think these are the most aggressive RSM that fits in the rules - unless someone has a better suggestion.....

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    what about needle bearings?


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