Ferrari Mailing List: Re: F1 Tachs

[Martin Stark (MStark]

The chronometric tachs I recall had escapement mechanisms that caused 
them to display the next higher or the next lower rpm increment when 
that rpm increment was fully reached - not the average.  The theory 
behind this was to make them easier to read by eliminating the over and 
under shoot of mechanical tachs without resorting to damping. We used 
one with a "rat" in a race car I helped build back in the mid 60's. It 
was driven by a flexible shaft off the car's magneto.

red5hilser [at] aol.com wrote:

> I noticed this? from films back in the 1950's and '60s with British Lucas and 
> Smiths tachs. They were built this way and there's a reason, but I forgot why. 
> Sir Sterling had them in his Coopers and Lotus cars for sure.
>
> Yer pal, Ferrari Bubba
>
>
> -----Original Message-----
> From: LarryT 
> Subject: [Ferrari] F1 Tachs
>
>
>
>    Was watching a 70s-80s Montecarlo F1 race and their in-car camera with the 
> F1 tachometers in screen they  seem to have delayed movements -- also,  they 
> seem to bounce several 1000 rpm's in a very jerky motion. Seems like some 
> historic cars from 30s do the same.
>
>    Is this the way the tachs are wired?  Or is the sensor erratic - although 
> that seems unlikely. \\
>
>    Just curious -  thx
>
> Sincerely,
> Larry T  (74 911, 91 300D 2.5T)
> www.youroil.net Oil Analysis Kits &
> Porsche Posters/Weber parts
> .
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