Actually, the grooves don't help cooling but they do allow
"outgassing" of the pads. The really good pads don't
have significant outgassing if they are bedded in properly.
In the worst case, outgassing prevents 100% contact b/n
the pad and the rotor, the slots provide an escape path
for the gas.
As I said, this isn't a big issue for the best pads.
BTW, I should have mentioned that when you choose
high performance pads for street use, make sure they work
well at low temperatures. A lot of the race pads don't really
until they get really hot.
Black Flash and Carbon Kevlar both work well cold and
of course street pads like Metal Kings do as well.
Mike
----- Original Message -----
From: Hanna, Mark <mhanna@ball.com>
To: <miq@teleport.com>; <Ajhsys@aol.com>
Cc: <gottstein@erols.com>; <spridgets@autox.team.net>
Sent: Tuesday, 24 August 1999 7:39
Subject: RE: Drilled rotors
> Miq ,
> About how wide would you recommend the grooves to be ? Also any thoughts
> about their orientation and the spacing between each groove ? I like the
> idea .
> Mark Hanna
> AN5
> > -----Original Message-----
> > From: miq@teleport.com [SMTP:miq@teleport.com]
> > Sent: Monday, August 23, 1999 3:12 PM
> > To: Ajhsys@aol.com
> > Cc: gottstein@erols.com; spridgets@autox.team.net
> > Subject: Re: Drilled rotors
> >
> > Ajhsys@aol.com says:
> > >
> > > In a message dated 8/23/99 11:43:26 AM Eastern Daylight Time,
> > > gottstein@erols.com writes:
> > >
> > > << Apparently I need to get new front rotors for my Midget, so I
was
> > > wondering, is it worthwhile to get those "performance" drilled
rotors,
> > or
> > > will I be fine with the regular replacement kind? Anything to stop
the
> > > little guy faster would be welcomed. >>
> > >
> > > - - - - - - - - - - - - - - - - - - - -
> > >
> > > The reason for cross drilling brake rotors is to vent hot air away
from
> > the
> > > pads, thereby reducing fade. This is really only necessary when you
are
> >
> > > driving in competition. On the road your pads will have plenty of
time
> > to
> > > cool between braking.
> > >
> > > If you have experienced a lot of brake fade in whatever type of
driving
> > you
> > > do, go for the drilled rotors. If you haven't, stay with the less
> > expensive
> > > solids. Theoretically, a solid rotor has more surface area than a
cross
> >
> > > drilled rotor, so it should stop the car faster, until the pads
> > overheat.
> > > (IMHO of course.)
> >
> > And if youare experiencing enough fade and heat to warrant "cross
drilled"
> > rotors, you will likely also be experiencing enough heat and stress to
> > snap
> > the rotor from the hub like a cheap straw hat.
> >
> > You are much better off getting solid rotors slotted. A competent
> > machinist can cut the grooves the same depth as the recommended wear,
and
> > then not only will you get the benefits of gas venting and cooling, but
> > also the strength of a solid rotor and a tell tale for rotor wear.
> >
> >
> > --
> > __
> > Miq Millman miq@teleport.com
> > Tualatin, OR
>
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