Robin nailed it.
It's most likely an RPM-related (not speed-related) sympathetic
vibration.
- Bob Mann
Robin Krause wrote:
>
> Diana,
>
> I had a similar buzz, and it turned out to be a crack in the heat shield
> between the carbs and the manifold. They have a tendency to crack around
> the bolt holes and are easy to have welded. It was REALLY annoying, but not
> a running or safety issue. And, it's intermittent because it only gets
> buzzing at certain rpms.
>
> Just a guess. . .
>
> Robin
>
> >From: "Diana Wilson" <goldenmaia@onebox.com>
> >Reply-To: "Diana Wilson" <goldenmaia@onebox.com>
> >To: datsun-roadsters@autox.team.net
> >Subject: Those sounds...
> >Date: Mon, 21 May 2001 11:15:19 -0700
> >
> >I have to admit, I've been a /little/ jumpy about the little car since
> >I've had him this past week. Those startled 'what's that'...and 'is
> >that normal?', when going over bumps, ruts and zipping around corners
> >or just in general driving. I just want to be /sure/ that a certain
> >noise I'm hearing is harmless.
> >
> >When decelerating slowly, between 30 - 25 mph he sort of buzzes.
> >Bbbzzz...but
> >if I give a bit more gas or downshift it goes away. (Is that
> >normal/typical?)
> >
> >I know I have to 1) Replace/repair the clutch (but since I'm relearning
> >shifting it seemed silly to bother with it until I get the hang of it
> >+ I wanted to DRIVE him while the weater was nice!) 2) The transmition
> >needs work...(see #1) I just want to be sure the sound isn't something
> >that needs attention ASAP.
> >
> >Thanks for the help! :)
> >
> >-D-
> >(Oh boy this is going to be an expensive Winter...I guess I know what
> >to ask Santa for! :> )
> >
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> _________________________________________________________________
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