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I've heard on this very list that cross-drilled rotors make a
wooshing/whistiling/annoying noise as they go down the road.
To note, though, the noise should NOT be noticeable inside the car with
the windows closed. The statement made on this list by someone was that
when driving along a wall with the windows down, one could hear the
whistling of air as it got sliced up by the holes.
As always, I defer to other q-list-meisters...
On Fri, 30 Jul 1999, DeWitt Harrison wrote:
> On Fri, 30 Jul 1999 08:47:30 -0400, Jeff Donnelly wrote:
> >This post showed up on a BMW list recently
> >>Has anyone ever had cross drilled rotors hum or howl on their car driving
> >>down the road? A shop called today with a customers Audi S6 with Porsche
> >>rotors making a lot of noise merely driving down the road (ie, not under
> >>braking). I suspect the air flow through the rotors is reacting with the
> >>customers particular 5 spoke wheels and creating some noisy oscillations.
> >>Similar to the droaning noise over some open sunroofs. Anyone ever
> >>experience this or have any other thoughts? SD
> >>Steve D'Gerolamo - The Ultimate Garage
> >>201-262-0412 / firstname.lastname@example.org / http://www.ultimategarage.com
> I don't buy the hypothesis. There is so much collective experience with
> drilled rotors that, if it were true, the phenomenon would be common knowledge
> among gear heads. It isn't as far as I can tell. Investigating a sticking
> caliper piston,
> bad wheel bearing, etc., would probably bear more fruit.
> DeWitt Harrison
> Boulder, CO
> 88 5kcstq
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