Mike9311
Joined: 14 Dec 2004
Posts: 1798
Location: Chicago-ish
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 Posted: Fri Apr 16, 2010 1:59 am Post subject: |
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| fiat22turbo wrote: | Mike,
Modern brake pads do not "outgas" like older style pad compounds that many are used to. This has been confirmed by multiple brake engineers (both OEM and aftermarket/racing)
There may be an advantage to drilled rotors in wet conditions by providing a path for the water to leave the face of the rotor (since water doesn't compress well at all) and an advantage to brake pad/caliper piston cooling, but if you are running into issues like that then perhaps a set of proper cooling ducts.
Drilled rotors appear to be mostly used for marketing and to help give performance cars a chance of having the large rotor diameters needed to provide good leverage (and to make them legal for certain racing classes) while reducing the surface area to allow them to work at the slow speeds that the cars will typically see since brakes need to be within their working temperature to work properly.
Bottom line, I wouldn't use them as they offer too many disadvantages compared to a properly engineered and built brake system. |
The part about outgasing is super difficult to verify since the entire industry of consumer performance products still point this out (notice I left out "fact" as in "left this fact out"). I just check several of the big boys web pages for info, EBC, Performance Friction, and Hawk. The only reference I found was by an unidentified person on eopinions which I trust as far as I can throw. You are right, this could be a current marketing ploy which means we won't get a real answer. I could see how brake pads could be made differently now and without you bringing it up, I would not have thought about it. I will leave it at that.
I also agree to the point about a properly engineered system. This is a big reason why certain rotors exist like the ones with major cross drilling and scallops. They do this because the the type of racing can benefit from lighter brakes. They don't brake so much as do controlled slides in dirt track for instance which puts less stress/heat into the brakes.
The water part though I can attest to from personal experience but only from the standpoint of starting out on the street with cold brakes or possibly from the pits in rain conditions. The first few seconds of application is better with drilled rotors. After they heat up and that sensation is no longer there.
So back to the engineered system...agree entirely. Purpose built is another good term.
oh, and I am sooo not going to tell you guys what I am up to until its proven out.
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
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