Date: Sun, 04 Jun 2006 07:43:35 -0400 From: KeithG <noonenospamay.com> Subject: Re: Brake Pad Recommendation For 1996 9000 CS
Cross drilled rotors were developed for racing applications. In such applications, they are used for one race. They are drilled, mainly, to reduce unsprung/rotating mass. There are theories as to gas buildup and such, but they will 1) warp easier due to less mass 2) crack from the holes due to less mass/stress risers from the holes 3) life will be significantly longer due to 1 and 2 4) eat up pads, as it will function like a cheese grater on the comparatively soft pads against the hard rotor. Do it if you want, but just understand that it is bling and a poor engineering trade off. Fred's comments echo this. KeithG Fred W wrote: > Dave Hinz wrote: >> On Fri, 02 Jun 2006 07:44:35 -0400, Fred W >> <Malt_Houndnospamm-me-not*yahoo.com> wrote: >> >> >>> I would not recommend cross drilled rotors. You don't need them and >>> they are more likely to warp, crack and will wear your pads faster no >>> matter what you get. >> >> >> My experience differs from your comment, Fred. The increased cooling of >> the crossdrilled rotors (allegedly) reduces operating temperature, so >> the pads allegedly last longer. I didn't try a comparison but I >> certainly didn't notice anything being _worse_. Stopping distance >> seemed to improve. >> >> >>> The only thing they have going for them is bling factor... >> >> >> Then why do they use them on motorcycles? I was of the impression it >> was about improving stopping distance and reducing heat into the braking >> system which causes fade. >> > > The only thing that I have seen that can be confirmed to be effective is > that the holes will allow gasses generated by the hot pads to escape, > rather than be trapped between the pad and disk surface. > > When I put the Zimmermans (purported to be among the best as they are > cast with the holes rather than drilled after the fact) on my '92 9000T > I really wanted them to be the shiz-zat. I mean hell, I paid extra for > them and they looked extra-spiffinatious through the SPG style wheels. > But I came to realize that (at least in my application) they were all > show and no go. They were *much* noisier and I could not acertain any > improvement in stopping distance. > > Then after only ~5-6k miles they started to warp. Ugh... I took them > off at that point and had them turned (against better judgement) and > they lasted another 5-6 k miles until I eventually sold the car. > > Maybe it was my choice of pads with the disks that caused my > dissatisfaction (actually had 2 different sets in that measley 10k > miles, Pagids and PBRs) but I was... well, underwhelmed. >
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