Question Regarding ST Rules

Rich Anderson · **Posted:** Thu Dec 22, 2005 10:34 am

I am trying to understand the ST rules. Here is what my brain is not getting:

2006 SCCA Solo Rules wrote:

14.8.H. Live axle suspension allowances:
1. Addition or replacement of suspension stabilizers (linkage
connecting the axle housing or DeDion to the chassis, which
controls lateral suspension location) is permitted.
2. Traction bars or torque arms may be added or replaced.
3. A Panhard rod may be added or replaced.
4. The upper arm(s) may be removed, replaced, or modified,
and the upper pickup points on the rear axle housing may be
relocated.
5. The lower arms may not be altered, except as permitted
under 14.8.C, or relocated. Methods of attachment and attachment
points are unrestricted, but may serve no other
purpose (e.g. chassis stiffening). This does not authorize
removal of a welded-on part of a subframe to accommodate
the installation.

OK, I get 1 thru 4, no problem. 5 is what gets me. It sounds like I can run an additional bracket to move the pickup point of the arm because of the point of attachment clause. However, that contradicts the relocation wording earlier. Now onto the referenced 14.8.C

2006 SCCA Solo Rules wrote:

14.8.C. The following allowances apply to strut-type suspensions. Adjustable
camber plates may be installed at the top of the strut
and the original upper mounting holes may be slotted. The
drilling of holes in order to perform the installation is permitted.
The center clearance hole may not be modified. Any type of
bearing or bushing may be used in the adjustable camber plate
attachment to the strut. The installation may incorporate an
alternate upper spring perch/seat and/or mounting block (bearing
mount). Any ride height change resulting from installation of
camber plates is allowed. Caster changes resulting from the use
of camber plates are permitted.

What does this have to do with anything? I am confused as to why that is mentioned. Can anyone figure this out?

DickRasmussen · **Posted:** Thu Dec 22, 2005 1:37 pm

Rich,

In regard to your second question (14.8.C), what is your question?

If it means what it "used to mean" in SP it defines what is allowed with camber plates, etc. at the top of struts to change camber/castor. It limits the modifications allowed and clearly states what is allowed.

Dick

Rich Anderson · **Posted:** Thu Dec 22, 2005 2:18 pm

DickRasmussen wrote:

Rich,

In regard to your second question (14.8.C), what is your question?

If it means what it "used to mean" in SP it defines what is allowed with camber plates, etc. at the top of struts to change camber/castor. It limits the modifications allowed and clearly states what is allowed.

Dick

I guess I am confused because I am looking at rules regarding modification to lower arms of a live axle rear suspension and it refes me to rules on camber plates for front struts. It all seems irrelevant to me. I don't know what the center hole, bushing or bearing mounts for dampers or caster has to do with any of this. The lower arm might house the spring, but the damper is seperate in every case I have seen. I guess I am lost as to what parts of that rule can be applied to a lower arm of a live axle and how.

DickRasmussen · **Posted:** Thu Dec 22, 2005 2:32 pm

Rich,

Now I understand your question (and I should have understood it originally . . . my bad).

I think it is a typo. Comparing to the SP reference it appears the ST reference should have been to 14.8.B

15.8.H references 15.8.C which covers bushings. The SP strut top rule is in 15.8.F.

I guess the volunteers (according to Andy Hollis on SCCA Forums) who do the cut and paste got it wrong.

Dick

Rich Anderson · **Posted:** Thu Dec 22, 2005 2:42 pm

Thanks Dick! I was really begining to wonder. So basically lower arms must have like stock bushings and no bearings. That makes a whole lot more sense than the other section.

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