On 22/09/2007, at 5:52 AM, Stephen West-Fisher wrote:
> I was under the impression that cross drilling the rotors was done
> to allow
> the gasses to escape from the high performance pads in use a number
> of years
> ago, not for heat dissipation. Using the current crop of high
> performance
> pads, the gas problem does not occur, so the high performance folks
> I know
> do not use cross drilled rotors. Only the "show car" types do.
>
>
Well I did not go for cross-drilled and grooved/vented rotors for any
bling factor (no-one can see my discs).
Of course we will never know if these rotors are the reason I have
not warped another disc in the five or six years since I changed to
them - but that is the outcome. Three years of competition and a
warped rotor using the standard ones and since then no problems.
The track I compete on primarily is VERY hard on brakes with almost
every corner a hairpin with the back straight braking from 110mph+ to
25mph (which is where I warped the old disc).
I have no reason to change - and no reason not to recommend others do
the same as I did. I use high-performance/metallic pads... and don't
go through an excessive aount of those either.
Eric
'68 MGB MkII
Adelaide, South Australia
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