Don't know, but Moss and Victoria mention the drilled rotors (with holes)
but refer to them as vented or ventilated - helps the pad disperse water
quicker. Whatever the term, that's what I'm referring to. I was wondering
if anyone had tried them... catalogs seem to tout them as god's gift to wet
weather breaking, but perhaps I'm just naturally cynical.
At 06:18 PM 4/24/00 -0700, Max Heim wrote:
>Excuse me, but why would vented rotors be of help in wet weather? I
>believe you are thinking of cross-drilled rotors. Vented rotors consist
>of two solid disks separated by radial vanes, which in motion direct
>cooling air across the back of the braking surfaces (looking at the edge
>of the disk you woud see that it is thicker than usual and has
>rectangular openings around the circumference). This serves to reduce
>brake fade by cooling the rotors more quickly. This extra cooling would
>not be of any help in wet weather. Sometimes vented or solid rotors are
>cross-drilled (round holes are drilled in a symmetrical pattern at right
>angles to the braking surface, giving a "swiss cheese" appearance to the
>rotor). This actually removes braking surface, but adds even more cooling
>surface, and has the additional effect of giving any water on the disk an
>additional outlet. I have heard that it may also give the brake shoes an
>"edge" to bite on, leading to shorter stopping distances, but I am not
>sure of this.
>
>Tab Julius had this to say:
>
> >
> >I'll look servo assists - thanks. I don't expect much from the vented
> >rotors except in wet weather, but I get plenty of that here, so I might do
> >those. But the servo assists sound intriguing...
> >
> >Thanks
> >
> >- Tab
> >
> >
> >At 06:30 PM 4/24/00 -0300, Michael P. Ohleger wrote:
> >>Tab,
> >>
> >>I added a servo assist to my 67. Had great results. All the other stuff
> >>is ok
> >>albeit extra $$$$ and I don't think it will stop you any faster unless you
>add
> >>the assist. The servo gave me greater stopping power and was the closest
> >>thing
> >>to power brakes I could find. Cheers
> >>
> >>Michael
> >>
> >>Tab Julius wrote:
> >>
> >> > For a '78B
> >> >
> >> > All my other vehicles are '90+, and as much as I love the MG, I must say
> >> > that the brakes are quite a change (but of course, similar to what I
> grew
> >> > up with).
> >> >
> >> > I don't mind trying to spend a little to improve them, though I'm not
>going
> >> > to redo the whole system, as the car is currently in one piece and still
> >> > being used. Both Moss and Victoria sell Ventilated Rotors - anyone
> tried
> >> > them? Opinions from those who know about them?
> >> >
> >> > Also, VB sells a "brake kit" which includes the aforementioned rotors,
>plus
> >> > 4-piston calipers, carbon fiber pads, etc. Thoughts on this
> >> > setup? Alternatives?
> >> >
> >> > Finally, would DOT 4 or DOT 5 be best? (never mind - just joking). But
>the
> >> > above questions are valid.
> >> >
> >> > TIA,
> >> >
> >> > - Tab
> >
> >
>
>
>--
>
>Max Heim
>'66 MGB GHN3L76149
>If you're near Mountain View, CA,
>it's the red one with the silver bootlid.
|