Brakes

[sfwilliams@comcast.net (Scott F. Williams)]

Being a non-engineer, I say to hell with all the theory. Look at the
friggin' test results. Do cross-drilled rotors seem to stop cars any quicker
than non-drilled? No, they don't.

It baffles me as to how this debate can rage on and on when the data's
already been collected.
--
Scott F. Williams
NJ Scirocco nut
'99 Subaru Impreza 2.5 RS
Mazda 323 GTX turbo "assaulted" vehicle
Golf GTI 16v "rollycar"
ClubVAC: "Roads found. Drivers wanted."

Check out our rally team's website!
http://www.usrallyteam.com

> -----Original Message-----
> From: scirocco-l-admin@scirocco.org
> [mailto:scirocco-l-admin@scirocco.org]On Behalf Of Eric Person
> Sent: Wednesday, April 24, 2002 1:21 AM
> To: Allyn; scirocco-l@scirocco.org
> Subject: Re: Brakes
>
>
> Not to start up this discussion again,
> but while i dont dispute the fact that X-drilled rotors have a greater
> overall surface area, I am not sold on the claim that this will cool the
> brakes faster.  It would seem that the holes would not greatly
> increase the
> effective convective heat transfer surface area, since the added surface
> area from the holes is basically inside of a small cylindrical hole and
> probably does not get sufficient airflow over this surface to transfer any
> significantly greater amount of heat than a stock rotor. It would
> seem that
> this combined with the reduced thermal mass would make a x-drilled rotor
> not an improvement over a non drilled one for most applications.   Maybe
> with some very well designed brake ducting, it may be possible to get some
> flow across the rotor(normal to the surface) but that is beside the point.
> Anyone have any other ideas or any real data to show the superiority of
> x-drilled rotors?
>
> Eric Person
> 86.5 16v
>
> >pro - they have more surface area and will cool faster between braking
> events (as well as heating up
> >slower during braking, attempting to counteract the less thermal mass
> thing). This is good for the
> >guy making frequent 20-40 mph drops in speed (i.e. on a track)... during
> the short stops the rotor
> >doesnt heat up enough to have a noticable effect on the pads coefficient
> of friction. The rotors
> >will cool quickly between braking events, making them better for frequent
> braking (where the solid
> >rotors would just heat up more and more every time the brakes are hit).
> >
> >aside - drilled rotors that are intended to be used under heavy racing
> conditions need to be made of
> >an alloy that will resist warpage under the increased thermal stresses
> from the faster heat/cool
> >cycles that the rotor has to live through. over the years, stock rotors
> have better mixes of metal
> >in them and can deal with the stresses of being x-drilled (to a point).
> >
> >bottom line - unless your intent is auto-x or some kind of track racing
> where you will be on the
> >brakes heavy and often, dont waste your cash on the x-drilled rotors.
> >
> >note - I'm putting brembo x-drilled/slotted/plated rotors on the rieger
> here shorty, but i am doing
> >so solely for the looks (gonna have 17's with a BUNCH of open space in
> there, and i REFUSE to look
> >like the cheey ass hondas/neons at work with 18's showing off their rear
> drums.
> >
> >Allyn Malventano, ETC(SS), USN
> >87 Rieger GTO Scirocco 16v (daily driver, 170k, rocco #6)
> >86 Kamei Twin 16V Turbo Scirocco GTX ('it has begun', rocco #7)
> >87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0 rattles,
> original clutch,
> driveshafts, wheels :)
> >
> >
> >----- Original Message -----
> >From: <JoshuaA.Conner@VerizonWireless.com>
> >To: <scirocco-l@scirocco.org>
> >Sent: Tuesday, April 23, 2002 9:34 AM
> >Subject: Brakes
> >
> >
> >> i know this has discussed before, but it seems the
> crossdrilled theory is
> >> that it's not really all that effective right? (compared to
> slotted)  My
> >> wonderings aloud are this:  i was recently at the local high
> dollar Lotus,
> >> Porsche, Ferrari, Aston, and everything else high zoot dealershit and I
> >> noticed all the over $50k cars with x-drilled not slotted.
> Why this? no
> >> flame wars plz, just dialogue  :)
> >>
> >> Joshua Conner
> >> OH//Customer Care, ext.  6165
> >> Verizon Wireless
> >> coolj@vtext.com
> >>
> >>
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