GERRY COX wrote:
>
> XYGAX wrote:
> >>
> >> Paint a white line on the flywheele and use one of those reflective opto
> >> switches then count pulses it also has the advantage of being a non
> contact /
> >> no mechanics interface
> >>
> >> Cheers Steve.....
>
> >Most Industrial sensors don't respond above 500Hz
> >this is done to limit noise
> >peter@cousens.her.forthnet.gr
>
> Peter,
> However, most diesel engines don't respond (for long)  above 500Hz * 60secs
> = 30,000 RPM
> This is also done to limit noise  :-)

Particularly the sound of bottom end bearing shells rattling around in
the sump.

> Gerry Cox
>  ----------