Re: [T3] Distributor misalignment (PPS)

["Bryan Castles" <bc@version3.net>]

<x-charset iso-8859-1>All of the cheap methods, are going to give you results that would not be
something that would give you the type of analysis you'd want.  Things like
compression bad recording medium will all make your data not very usable.
Secondly recording position and surroundings are going to create just as
much trouble.  How far away, mic position and the environment will make the
recording useless in some cases.  The fact is, to make any kind of analysis
on that type of sound, the only variable can be the engine you are
recording.  You'd have to use all of the same equipment, in the same
location every time for it to work.  And then it would need to be pretty
good quality, like a nice mic going to a DAT or even better, and 96K sound
card on a good PC.

Sorry, but it's a bigger project than just mailing around a recordable
walkman and a Mr. Microphone.

Bryan Castles
Arlington, TX
USA

'64 Beetle
'70 Bus (Ex-Westy)
'73 Square

www.version3.net


----- Original Message -----
From: "jim rustad" <jimrustad@hotmail.com>
To: <type3@vwtype3.org>
Sent: Tuesday, April 30, 2002 9:33 AM
Subject: Re: [T3] Distributor misalignment (PPS)


> That would be really interesting.
> Actually, one of the projects I was thinking of for parma
> would be to record a large number of type3 engines
> and then do an analysis of the frequency spectrum
> of each engine.  I have computer code
> which does this (they are easily available on the web)
>
>   This could be a useful diagnostic
> if the recording could be standardized.
> For example worn bearings may produce a band
> at frequency X, lifters at frequency Y, loose
> rod at Z, and so on.  Of course this may be a pipe
> dream, maybe you would just get a big ugly broad
> band...but it would be worth a try.  There is somewhere
> on the web a recording of different engine sounds
> (I think made by John Muir!)but I couldnt get much out of it
> by listening.
>
>   Only problem is
> I don't know much about recording equipment.
> Ideally the microphone would be cheap enough for everyone
> to buy the same one.  Another idea would be to have a circulating
> microphone which everyone could borrow (a possibility on
> this high-integrity relatively small type III list!).  Then
> the person could record their engine and could compare the
> spectrum to the database (provided on this site of course!).
>
> Any audiophiles out there who know how to record sounds cheaply?
>
> Jim Rustad
> 71 FI Square
> Kennewick WA
>
>
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