SV: Brakes (tech) Slotted vs X-Drilled

["Roland Johansson" <scirocco@mail.bip.net>]

Motorcycle brakediscs are usually made of steel when car discs
are cast iron. 
Go to a racetrack and look carefully at the brakes, no matter if
they are drilled or slotted almost all of their discs have
stresscracks in them after the race. For normal use slotted
don't stresscrack nut crossdrilled do after some time. Tried
both and now use slotted.



Roland Johansson
Scirocco 1,6l TIC -82
Http://hem.passagen.se/toker


> Yeah, but how come high performace motocycles use
crossdrilled? The
> x-drilled rotors can't be Satan's spawn as the slotted
advocates would put
> forth, but then again a motorcycle is different from a car.
All 4 of my
> brothers bikes are xdrilled. 93 Ninja Zx-6, 91 VFR 750, 94
Honda SR-250,
> and an old 78 Yamaha 400. But none of them are axially vented
like our 84+
> rotors are. to save wieght i'm sure.
> >>I'm not in any position to plug or unplug this paticular
company but the
> >slots
> >>vs x-drilled factions seem to be coming out in favor of the
slotted
> >ones.
> >
> >
> >I have to agree. Even tho there are manufacturing techniques
that help
> >limit the cracking factor of the drilled rotors, they
still_do_crack.
> >>Drilling seems to weaken the disks more, slotting allows the
heated
> >gasses
> >>generated by braking to escape at least as well as holes do,
although
> >some say
> >>just cutting a groove in the pads will work the same.
> >



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