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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@embarqmail.com
On Mon, Jun 7, 2021 at 9:06 AM Larry Mayfield <drmayf@mayfco.com> wrote:
> So I logged on to Kee=E2=80=99s web site and checked the parts out. The s=
peedo
> 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 ba=
t
> 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=E2=80=A6 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 probabl=
y
> good enough.
>
>
>
> I am good to go, =E2=80=A6
>
>
>
> Mayf
>
> TWFS
>
>
>
> *From:* Tigers <tigers-bounces@autox.team.net> *On Behalf Of *Donald
> Antilla
> *Sent:* Sunday, June 6, 2021 5:42 PM
> *To:* Jerry Christopherson <JCMC2006@suddenlink.net>; Tiger Autox <
> TIGERS@AUTOX.TEAM.NET>
> *Subject:* Re: [Tigers] 15 tooth
>
>
>
> David Kee toploaders has a 16 tooth gear. That might be =E2=80=9CClose en=
ough for
> Government Work=E2=80=9D as my dad used to say.
>
> http://4speedtoploaders.com/store/speedometergears.html
>
>
>
> *From: *Tigers <tigers-bounces@autox.team.net> on behalf of Jerry
> Christopherson <JCMC2006@suddenlink.net>
> *Date: *Sunday, June 6, 2021 at 7:26 PM
> *To: *Tiger Autox <TIGERS@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=E2=80=99t make a 15 tooth sp=
eedometer
> gear for the Tiger?? Could sell a bunch??
>
>
>
> Jerry Christopherson
>
> 9473187
>
> TAC insp. #58
>
> _______________________________________________ tigers@autox.team.net
> Donate: http://www.team.net/donate.html Archive:
> http://www.team.net/pipermail/tigers http://autox.team.net/archive
> Unsubscribe:
> http://autox.team.net/mailman/options/tigers/fast427@sbcglobal.net
> _______________________________________________
>
> tigers@autox.team.net
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/tigers
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">Bef=
ore you guys go off in search of the "correct" 15-tooth gear, you=
should consider other sources of error in your speed indication.=C2=A0 In =
stock form, the Smiths-Jaeger speedo=C2=A0is pretty linear, but it has an i=
ndicating error due to the fact that the indicating pointer is unbalanced.=
=C2=A0 This unbalance causes the speedo=C2=A0to 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).=C2=A0 =
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.=C2=A0 Jus=
t a rough balance is fine.=C2=A0 I then calibrated the speedo=C2=A0against =
GPS.=C2=A0 The calibration is done by just twisting the needle.=C2=A0 The n=
eedle is spring-loaded against the stop so the zero point stays fixed.=C2=
=A0=C2=A0
The speedo=C2=A0is now accurate to better that 1 MPH at up to 80 MPH.=C2=A0=
That's with 185-70X13=C2=A0tires and a 16-tooth gear.=C2=A0 Of course,=
the ultimate test of calibration is to check the odometer calibration.=C2=
=A0 I haven't done that, but you don't get speeding tickets for odo=
meter errors.</div><div class=3D"gmail_default" style=3D"font-size:small"><=
br></div><div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"=
gmail_signature"><div dir=3D"ltr">Will - 382001570 <br><a href=3D"mailto:Ti=
gers@embarqmail.com" target=3D"_blank">Tigers@embarqmail.com</a></div></div=
></div><br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"g=
mail_attr">On Mon, Jun 7, 2021 at 9:06 AM Larry Mayfield <<a href=3D"mai=
lto:drmayf@mayfco.com">drmayf@mayfco.com</a>> wrote:<br></div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px s=
olid rgb(204,204,204);padding-left:1ex"><div lang=3D"EN-US" style=3D"overfl=
ow-wrap: break-word;"><div class=3D"gmail-m_-6379216603804064978WordSection=
1"><p class=3D"MsoNormal">So I logged on to Kee=E2=80=99s web site and chec=
ked the parts out. The speedo gear is 15 bucks, a keeper is 4.50 for just a=
bout 20 bucks. Then Just for chuckles I out those into a cart with my zip c=
ode. Shipping prices are bat sh*t.=C2=A0 18 bucks for standard shipping, up=
to 96 bucks for hurry up. What I called a standard rate for shipping was 4=
0 bucks.=C2=A0=C2=A0 This pat weighs less than a standard envelope=E2=80=A6=
Sure glad I have my OEM one. <u></u><u></u></p><p class=3D"MsoNormal"><u><=
/u>=C2=A0<u></u></p><p class=3D"MsoNormal">Speedo gears, on cars driven so =
little, are likely to last near forever.=C2=A0 =C2=A0Would =C2=A0it be wort=
h making 15T ones to fit the 2.88: gear set with the small diameter size ti=
res? Likely not.=C2=A0 As mentioned before, a + 1 tire size might be enough=
for the ratio =C2=A0discrepancy (6%), and that is probably good enough. <u=
></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"=
MsoNormal">I am good to go, =E2=80=A6<u></u><u></u></p><p class=3D"MsoNorma=
l"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Mayf<u></u><u></u></p><p =
class=3D"MsoNormal">TWFS<u></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=
=A0<u></u></p><div><div style=3D"border-right:none;border-bottom:none;borde=
r-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in"><p c=
lass=3D"MsoNormal"><b>From:</b> Tigers <<a href=3D"mailto:tigers-bounces=
@autox.team.net" target=3D"_blank">tigers-bounces@autox.team.net</a>> <b=
>On Behalf Of </b>Donald Antilla<br><b>Sent:</b> Sunday, June 6, 2021 5:42 =
PM<br><b>To:</b> Jerry Christopherson <<a href=3D"mailto:JCMC2006@sudden=
link.net" target=3D"_blank">JCMC2006@suddenlink.net</a>>; Tiger Autox &l=
t;<a href=3D"mailto:TIGERS@AUTOX.TEAM.NET"; target=3D"_blank">TIGERS@AUTOX.T=
EAM.NET</a>><br><b>Subject:</b> Re: [Tigers] 15 tooth<u></u><u></u></p><=
/div></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNo=
rmal"><span style=3D"font-size:16pt;font-family:Arial,sans-serif">David Kee=
toploaders has a 16 tooth gear. That might be =E2=80=9CClose enough for Go=
vernment Work=E2=80=9D as my dad used to say.<u></u><u></u></span></p><p cl=
ass=3D"MsoNormal"><span style=3D"font-size:16pt;font-family:Arial,sans-seri=
f"><a href=3D"http://4speedtoploaders.com/store/speedometergears.html"; targ=
et=3D"_blank">http://4speedtoploaders.com/store/speedometergears.html</a><u=
></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:16pt=
;font-family:Arial,sans-serif"><u></u>=C2=A0<u></u></span></p><div style=3D=
"border-right:none;border-bottom:none;border-left:none;border-top:1pt solid=
rgb(181,196,223);padding:3pt 0in 0in"><p class=3D"MsoNormal"><b><span styl=
e=3D"font-size:12pt;color:black">From: </span></b><span style=3D"font-size:=
12pt;color:black">Tigers <<a href=3D"mailto:tigers-bounces@autox.team.ne=
t" target=3D"_blank">tigers-bounces@autox.team.net</a>> on behalf of Jer=
ry Christopherson <<a href=3D"mailto:JCMC2006@suddenlink.net"; target=3D"=
_blank">JCMC2006@suddenlink.net</a>><br><b>Date: </b>Sunday, June 6, 202=
1 at 7:26 PM<br><b>To: </b>Tiger Autox <<a href=3D"mailto:TIGERS@AUTOX.T=
EAM.NET" target=3D"_blank">TIGERS@AUTOX.TEAM.NET</a>><br><b>Subject: </b=
>[Tigers] 15 tooth<u></u><u></u></span></p></div><div><p class=3D"MsoNormal=
"><u></u>=C2=A0<u></u></p></div><p class=3D"MsoNormal"><span style=3D"font-=
size:14pt;font-family:Arial,sans-serif">Just had an idea, =C2=A0thought I w=
ould throw it out there in Tiger land.=C2=A0 Any reason someone that has a =
3-D printer couldn=E2=80=99t make a 15 tooth speedometer gear for the Tiger=
??=C2=A0 Could sell a bunch??</span><u></u><u></u></p><p class=3D"MsoNormal=
"><span style=3D"font-size:14pt;font-family:Arial,sans-serif">=C2=A0</span>=
<u></u><u></u></p><p class=3D"MsoNormal"><span style=3D"font-size:14pt;font=
-family:Arial,sans-serif">Jerry Christopherson</span><u></u><u></u></p><p c=
lass=3D"MsoNormal"><span style=3D"font-size:14pt;font-family:Arial,sans-ser=
if">9473187</span><u></u><u></u></p><p class=3D"MsoNormal"><span style=3D"f=
ont-size:14pt;font-family:Arial,sans-serif">TAC insp. #58</span><u></u><u><=
/u></p><p class=3D"MsoNormal">_____________________________________________=
__ <a href=3D"mailto:tigers@autox.team.net"; target=3D"_blank">tigers@autox.=
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_blank">http://www.team.net/donate.html</a> Archive: <a href=3D"http://www.=
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://autox.team.net/archive</a> Unsubscribe: <a href=3D"http://autox.team.net=
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ox.team.net/mailman/options/tigers/fast427@sbcglobal.net</a> <u></u><u></u>=
</p></div></div>_______________________________________________<br>
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</blockquote></div>
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