Re: Whistle?

[DeWitt Harrison <de@aztek-eng.com>]

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 / steved3@idt.net / 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