[s-cars] question about 993tt rotors

[Sean Douglas]

Ken:

I just swapped over billzcat1 custom hats and did not notice any
difference between left and right, seemed to be the exact same. Also, no
gasket either. Are you sure both rotors are for the 993tt?

I did notice however, that the "t-lock" fasteners you describe were a
very tight fit in the hats and I had to carefully press these in.

BTW, the torque value on the bolts is very low, 8 ft-lbs, IIRC.

Cheers,

Sean

> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Kenneth Keith
> Sent: Monday, April 24, 2006 2:16 PM
> To: 200q20V mailing list; s-car-list at audifans.com
> Cc: www.billzcat1.com
> Subject: [s-cars] question about 993tt rotors
> 
> 
> Hi,
> 
> Some of you may be running brakes using 993tt rotor rings and 
> custom hats, and able to help with my question.  I have a 
> Billzcat1 Turn 9 setup for my 200q20v, which has custom hats 
> and brackets to mount 996tt "big bloc" calipers and 993tt 
> rotor rings, and I've got a question about the hardware that 
> holds the rings to the hats, which consist of "t-lock" 
> fasteners and bolts.  I bought the kit with unused rotors 
> from a lister and am sorting things out to install them.
> 
> The t-lock fasteners (sort of a sleeved nut) that attaches 
> the rotor rings to the factory hats (which need to be removed 
> and replaced with the custom ones, re-using the hardware) are 
> different from left to right.  These t-lock fasteners have an 
> internally threaded tube that runs through both hat and 
> rotor, and the bolt goes through that from inboard.
> 
> One set/side (can't remember left or right) has longer 
> fasteners that bottom out against the bolt before the rotors 
> are clamped tightly against the hats, leaving the rotor able 
> to float away from the hat slightly, and the other set/side 
> has a stepped fastener that is quite a bit shorter and when 
> bolted up will put the hat in tight contact with the rotor 
> ring with no play.
> 
> The diameter of the holes in one rotor is about 5.0mm and the 
> other is 5.5mm, as far as I can tell.  Both t-lock fasteners 
> are 5.5mm towad the "head," as are the slots in the billzcat1 
> hats, and the "shorter" set of t-locks has stepped down to go 
> into the 5.0mm holes.
> 
> I think the 5.5mm sections of the shorter ones might be the 
> correct length to bolt up to the hat leaving some float, but 
> cinch up against the rotor firmly, while the other t-locks 
> are different and would leave both rotor and hat able to 
> potentially float along the whole fastener (instead of just 
> on the thicker part that goes inside the hat, being solidly 
> attached to the thinner part between the bolt and "shoulder" 
> created by the 5.5mm-to-5.0mm reduction.  I don't think more 
> words will help in describing this, so that's it for now. =)
> 
> In addition to this difference between left and right rotors, 
> I also found that one of the rotors had a thin black gasket 
> between the factor hat and rotor ring, but the other side 
> didn't have any such gasket.  The gasket is way thinner than 
> the difference in t-lock length (depth really, as the overall 
> length of the fasteners are the same, but the "shorter" ones 
> have a much thicker "head" area).
> 
> I haven't gotten a chance to take pics yet, but I will do 
> that.  My basic question is whether there should be a 
> difference between how the left and right rotors are attached 
> to the hats.  If one is better than the other, such as the 
> shorter ones that bolt up tighter, then should I shorten the 
> longer ones?  Right now, if I bolt it all up without worrying 
> about it, one rotor/hat combo is completely tight and the 
> other has play where the fasteners can slide back and forth 
> (or the hat pulled away from the rotor slightly).
> 
> Thanks,
> 
> Ken
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