Other thing that would be great is to isolate which noises are the chief
offenders at different speeds.

I can distinctly make out wind, engine, and tire/road.  I just put new tires
on the 7 pass., and the noise has gone down an incredible amount.

About a month ago I stuffed some chunks of used tire into the air space of
the Westy's tranny mount, and the noise level increased by that same
incredible amount.  Seems that the rear floor area acts as a sounding board
(quite effectively, I might add).

Karl Wolz
----- Original Message -----
From: "David Beierl" <dbeierl@ATTGLOBAL.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, January 16, 2001 11:57 AM
Subject: Re: road trip report - Calgary/Seattle

> A-weighted or C-weighted?  Only the A-weighted number is valid for
> hearing-damage purposes...(C-weighted is flat, A-weighted rolls off the
low
> end considerably).   Also, was it a $30 Radio Shack meter like mine, or a
> "real" one (there are $250 meters available, but to do OSHA industrial
> measurements you need the $1200 one as I recall (all prices about 15 years
> old...).
>
> I think it would be great to use the RS meter since they're cheap,
> available everywhere, and I *think* fairly consistent from meter to
> meter.  Also it would be good to have both C- and A- numbers, also
possibly
> fast and slow meter damping (four readings in all).
>
> david
>
> At 01:05 PM 1/16/2001, Keith Adams wrote:
> >I took some noise measurements along the way, using a borrowed sound
> >meter.  "quiet" highway driving (i.e. not pushing a big wind, 50 mph or
> >so) gave us between 84 and 88 dB.  "noisy" highway driving (i.e. pushing
> >a big wind, 70 or 75 mph) gave us 90 to 94 dB.  Both times radio on
> >(checked with radio off, but it doesn't do much) fan on #1, sound level
> >meter held at about head (sitting) height, between the two front seats.
> >Since the onset of hearing damage is 85 dB (i.e. 8 hours a day at 85 dB
>
> David Beierl - Providence, RI
>   http://pws.prserv.net/synergy/Vanagon/
> '84 Westy "Dutiful Passage"
> '85 GL "Poor Relation"
>