Turbo speed sensor - ferrite in comp wheel ?

[Espen Hilde]

Hi!
What obout drilling 2 holes in opposite side ,then the balance is ok
and use a light and optical reader trou the holes. 
Espen 
> >> I really would like to do a turbo speed sensor - so far no reply from
> >> the emails I've sent out to distributors - not even a "we don't do it"
:(
> >
> >What could work for a turbo speed sensor is strapping a microphone to it
> >and listening to the frequency it screams at. A wideband knock sensor
would 
> >work well. On my bike I can clearly hear the turbo sweeping through the 
> >frequencies as it speeds up.
> 
> mmm Hadn't thought of that - I suppose a cal check with an optical tacho
> would be the thing, since I've noticed the note changes with the length
> of inlet pipe and even type of air filter...
> 
> More I think about it - I'll go for a very small hole in the edge of the
> comp wheel - keep the aluminium swarf, weigh up a small ferrite bead and
> glue/wedge/solder this in to the hole. Hopefully the 0.05g difference
> won't radically upset my comp balance. With that setup and a fast
> reluctance pickup I should be able to get precise indication of speed.
> Will be an interesting exercise.
> 
> Any comments on the best means to attach a ferrite bead into the edge
> of the comp wheel and not have it fall out at 150K rpm ?
> 
> <groan>
> 
> ?
> 
> 
> 
> Rgds ~`:o)
> 
> Mike Massen         Trading as "Network Power Systems" and "Network
Computers"
> Perth, Western Australia  Ph +61 8 9444 8961  Fx +618 9264 8229 (fax ->
email)
> Products/Personal/Client web area at http://www.wantree.com.au/~erazmus
>  (Current pics - trip to Malaysia to install equipment in jungle power
site)
> 
> Some say there is no magic but, all things begin with thought then it
becomes
> academic, then some poor slob works out a practical way to implement all
that
> theory, this is called Engineering - for most people another form of
magic.
> 
>
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