Drilling stock rotor castings is a waste of time. They crack
because most cast iron material used isn't suitable for drilling.
The more $$$ drilled rotors are cast in a different material
or they usually are. Drilled rotors make's a noise similar to
a big truck when braking. Slotted rotors clean the pads but
makes less noise than drilled. The slots dont cool the rotors.
Thomas
datsunmike wrote:
> Rob,
>
> In Grassroots there was an article re: drilled/slotted rotors. They said it
> is a waste of $$$$ and from what I gather from other sources the drilled
> rotors, except the $$$$ ones, are, for the most part junk - Radial stress
> cracks and broken rotors. Slotted is better but doesn't improve braking. As
> stated in the article "gassing" is no longer a problem with the pads made
> today.
>
> Ventilated rotors are better.
>
> Mike
>
> ----- Original Message -----
> From: "R Haug" <haugchiro@moscow.com>
> To: <datsun-roadsters@autox.team.net>
> Sent: Friday, February 09, 2001 8:50 AM
> Subject: drilled and slotted rotors
>
> > List,
> > I am considering replacing my standard rotors with the drilled and
> > slotted rotors for my 67.5.
> > Has anyone used these on the street?
> > If so, is there much difference in braking with these as compared to to
> > standard rotors?
> > Is there any increased or decreased noise?
> > I would think there may be an improvement in fade resistance.
> > Maybe a slight decrease in unsprung weight.
> > Anything else?
> > Bob
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