[Tigers] 15 tooth

[Will Seay]

Before you guys go off in search of the "correct" 15-tooth gear, you should
consider other sources of error in your speed indication.  In stock form,
the Smiths-Jaeger speedo is pretty linear, but it has an indicating error
due to the fact that the indicating pointer is unbalanced.  This unbalance
causes the speedo to read low (because it's lifting the weight of the
pointer) for the first half of its rotation (0 - 70 MPH) and to read high
for the second half (downhill from 70 MPH).  I balanced my pointer by
coiling up a short length of solder and placing it in the base of the
pointer to counter the weight of the pointer.  Just a rough balance is
fine.  I then calibrated the speedo against GPS.  The calibration is done
by just twisting the needle.  The needle is spring-loaded against the stop
so the zero point stays fixed.   The speedo is now accurate to better that
1 MPH at up to 80 MPH.  That's with 185-70X13 tires and a 16-tooth gear.
Of course, the ultimate test of calibration is to check the odometer
calibration.  I haven't done that, but you don't get speeding tickets for
odometer errors.

Will - 382001570
Tigers at embarqmail.com


On Mon, Jun 7, 2021 at 9:06 AM Larry Mayfield <drmayf at mayfco.com> wrote:

> So I logged on to Kee’s web site and checked the parts out. The speedo
> gear is 15 bucks, a keeper is 4.50 for just about 20 bucks. Then Just for
> chuckles I out those into a cart with my zip code. Shipping prices are bat
> sh*t.  18 bucks for standard shipping, up to 96 bucks for hurry up. What I
> called a standard rate for shipping was 40 bucks.   This pat weighs less
> than a standard envelope… Sure glad I have my OEM one.
>
>
>
> Speedo gears, on cars driven so little, are likely to last near forever.
>  Would  it be worth making 15T ones to fit the 2.88: gear set with the
> small diameter size tires? Likely not.  As mentioned before, a + 1 tire
> size might be enough for the ratio  discrepancy (6%), and that is probably
> good enough.
>
>
>
> I am good to go, …
>
>
>
> Mayf
>
> TWFS
>
>
>
> *From:* Tigers <tigers-bounces at autox.team.net> *On Behalf Of *Donald
> Antilla
> *Sent:* Sunday, June 6, 2021 5:42 PM
> *To:* Jerry Christopherson <JCMC2006 at suddenlink.net>; Tiger Autox <
> TIGERS at AUTOX.TEAM.NET>
> *Subject:* Re: [Tigers] 15 tooth
>
>
>
> David Kee toploaders has a 16 tooth gear. That might be “Close enough for
> Government Work” as my dad used to say.
>
> http://4speedtoploaders.com/store/speedometergears.html
>
>
>
> *From: *Tigers <tigers-bounces at autox.team.net> on behalf of Jerry
> Christopherson <JCMC2006 at suddenlink.net>
> *Date: *Sunday, June 6, 2021 at 7:26 PM
> *To: *Tiger Autox <TIGERS at AUTOX.TEAM.NET>
> *Subject: *[Tigers] 15 tooth
>
>
>
> Just had an idea,  thought I would throw it out there in Tiger land.  Any
> reason someone that has a 3-D printer couldn’t make a 15 tooth speedometer
> gear for the Tiger??  Could sell a bunch??
>
>
>
> Jerry Christopherson
>
> 9473187
>
> TAC insp. #58
>
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