They are also numbered. I want a 15R. Anyone have a good one.
Chris in Trindad
Larry Paulick wrote:
> Jan, they do make a device that either reduces or advances the revs of
> the speedo, and is adjustable. Many hot rods also have odd combinations
> of tires, trans, rear ends, and this allows for the adjustment. With
> the toploader and T-5, you just go to your Ford dealer, and ask for a
> different gear for the end of the speedo cable. They are usually
> identified by color, as in I want a blue one.
>
> Larry
>
> jeyerman@ix.netcom.com wrote:
> >
> > It would seem to me that this a very big market for an electronic
>speedometer- a small magnet glued to the driveshaft and a pickup somewhere
>near it-then an electronic speedo inside a Smith's case. An adjustment
>somewhere for rear axle ratio. To bad I don't know how to do this!
> >
> > Jan
> >
> > Jay_Laifman@countrywide.com wrote:
> > > >Jay, after you give them the info from the speedo, what
> > >do they do, and is the speedo accurate over the entire
> > >range, and is so to what plus or minus mph?
> >
> > I just spoke to Mo-Ma. She told me that if she used to 1040 gauge I have
> > (from a SIV Automatic), she could use a 41 tooth gear and get pretty close,
> > but not exact. I may have to go to an external converter to get closer to
> > exact.
> >
> > The speedo is a completely different issue. It is not fixed by gears. I
> > know I am going to get corrected on this one. But, this is as close as I
> > know - and as always, I'm willing to be corrected. Attached to the head of
> > the cable is a flat disk with a magnet. This disc fits in a flat metal
> > dish to which the needle is attached. There is nothing connecting the dish
> > to the disk. When the magnet on the cable spins, it creates a magnetic
> > force that lifts/turns the dish and the needle. As the dish spins faster,
> > the force increases and turns the disc further. In order to calibrate the
> > speedo then, they don't change gears, but change the amount of magnetism in
> > the dish or the plate or both. There is also, I think, and adjustment to
> > the resistance against the plate.
> >
> > That being said, I believe there is an inherent inaccuracy in the speedo
> > needle such that it cannot be 100% accurate at all speeds. You need to
> > pick what range you want to be most accurate, and live with the other
> > zones. My driving takes me through a very long 45 mph speed trap. But,
> > then 65 is always a concern. I don't know how wide the band is of
> > accuracy. I'll probably shoot for right in the middle of those two.
> >
> > Jay
|