Reynolds number is a dimensionless unit, the ratio of inertial force to viscous
force,
which is used in fluid flow calculations. It is important, for example, in wind
tunnel
applications, where the density and/or temperature of the fluid flowing around
a scale
model of a vehicle is manipulated to yield the same Reynolds number as the full
scale
system.
I've never cracked a speedo open, so I don't know exactly what the mechanism is
that
utilizes the DAMPING :^) fluid to control speedo needle motion, but if it
involves a solid
moving relative to a fluid, then there is a Reynolds number associated with the
system,
and utilizing a fluid of a different viscosity will affect operation - but how
large the
effect depends upon a lot of factors, and it may take a considerable change in
viscosity
to affect the system.
Gary McCormick
San Jose, CA
jon_wissler@pngc.com wrote:
> OK, enough is a enough, what the heck are "Reynolds numbers"?
>
> STAN CHERNOFF <az589@lafn.org>
> Sent by: owner-datsun-roadsters@autox.team.net
> 10/22/2001 11:46 AM
> Please respond to STAN CHERNOFF
>
>
> To: Dan and Louise Yates <yates@sk.sympatico.ca>, roadsters list
> <datsun-roadsters@autox.team.net>
> cc:
> Subject: Re: Tach Cable question
>
> Dan,
>
> It is a measure of viscosity. Reynolds numbers can also have an effect on
> the the performance.
>
> Stan
> ===========
>
> At 12:30 PM 10/22/01 -0600, Dan and Louise Yates wrote:
> >Let me be the first to ask, what the hell is a centistoke??
> >
> >Dan Yates
> >
> >
> >> Mike:
> >>
> >> Starting with the cable is always a good idea, but if it is not doing
> the
> >> trick then the instruments are probably the culprit.
> >>
> >> Most of the time when the Tach, or the Speedo start to get "bouncy" it
> is
> >> because the silicone dampening that the factory put in 35 years ago has
> >> finally ran out. The only real way to get it to behave for good is to
> go
> >> inside the instrument and refill the dampening cup. I know these gauges
> >are
> >> not exactly maintenance friendly because of there crimped on bezel assy
> >(Yes,
> >> it can be done) but, the good news is that it lasts for a good 20
> years,
> >so
> >> you probably won't have to do it again in you lifetime.
> >>
> >> A dampening fluid of about 100,000 centistokes works best.
> >>
> >> Hope this helps
> >>
> >> Jon
> >> Huntington Beach, Ca
> >>
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