Date: 29 Nov 2002 04:13:54 -0800
From: alancemornopsamo.com (Lance Morgan)
Subject: Re: c900 harmonic droning?


"Johan Beikes" <j.beikesnopsamdoo.nl> wrote in message news:<3de69281$0$10860$8fcfb86bnopsam.wanadoo.nl>... > Lance, > > Another idea hit my mind: what about the exhaust system. Could it be too > tightly mounted somewhere, so that noises of the exhaust are passed on to > the chassis? > Worth to look at, before thinking of more expensive fixes, i would think. > > Johan > > "Lance Morgan" <alancemornopsamo.com> wrote in message > news:2a52f3e9.0211241647.193dd2ffnopsaming.google.com... > > I recently purchased a 91 900S (briefly had a 86 900T years ago), and > > am really enjoying it. > > > > I've noticed something I'd appreciate comments on: a harmonic type > > droning - always starting at 70 mph up to at least 85 mph, and have > > also sometimes heard it ~ 45 mph in 3rd, albeit a slightly different > > tone. > > > > The noise is moderate in pitch and, at high speed, has a repetitive > > frequency of less than 1 second. It reminds me of riding in a twin > > engine airplane > > > > The noise completely abates when I push the clutch in, coasting at > > high speed. > > Lance > > 5 spd 3dr 125K I did do a moderate exhaust system ck a few days ago - no leaks, components in relatively good cond (after replacing exhaust mani tube to downtube flange gaskets), clearances seems okay, hangars good. Altho it is lacking the wonderful exhaust note I recall in my 86 900T (not sure if the turbo 'muffling' characterstics and/or exhaust components are responsible for this). I've got another car up on the ramps right now, but will reinspect the exhaust system soon. My main concern is that this might be an engine problem, which hopefully seems the least likely, as will likely be replacing the tranny sometime in the near future as a matter of course.

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