> >Can you sample your accelerometer data with your 20G sensor and then
> >look at it with a sound editor so you can scroll through the data set
> >easily (Audigy is free OSS).
> >You could then also do a FFT on the signal at a constant motor RPM and
> >see if the cylinder firing rate is the dominant noise source or
> >something else.
> >You really need to look at your signal to see why it isn't filtering as
> >you expect.
> >
> >3M makes a noise damping tape that you might be able to fit on one side
> >of your mounting plate. It is 0.15 mm thick but works amazingly well to
> >damp HF ringing of metal.  A 2 x 6" steel plate going from 'ping' with
> >long ring tone, to 'thunk' with just a 1" square of tape applied.

Are you sure that the electronics box isn't moving far enough on its flexib=
le mounting that it hits the frame on big bumps?
--=20
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