Subject: Re: [Healeys] speedo questions

From: Bluehealey <[email-masked]>
Date: Sun, 4 Dec 2016 21:34:38 +0000

Hi Bob.
For what it's worth I have found that 1152TPM is the closest calibration I could get to suit the set up on Bluehealey.  I have a 3.54 Lempert diff on overdrive box with 180XAS Michelins. Rolling radius of those I found to be 312mm (12.3").
The set up uses a 32tooth worm wheel and 36 tooth Odo wheel.  The displayed mileage and actual mileage are pretty close and have been checked over a few hundred miles against a Sat Nav. Error is about 1-2%.
Your tyres will be the only variable with my arrangement.
Speedo calibration is all over the place. I just moved the needle, relative to the drive cup, until 60mph matches my sat nav display.  All other speeds above and below will be off a margin.
Give me your rolling radius of the tyres and I will be able to provide the best Turns per mile sett up.
Enjoy.

Alan - from my iPad

> On 4 Dec 2016, at 19:32, Bob Haskell <[email-masked]> wrote:
> 
> Listers,
> 
> What's the thickness of the washer that is fitted between the gearbox and the right angle drive (PN 3H550 or Moss PN 324-720)?
> 
> There are two MPH speedometers fitted to the 3000 MkI and MkII; one for overdrive and one for non-overdrive cars.  What's the speedometer calibration (turns per mile) for each?
> 
>        BMC P/N    Smiths P/N   TPM
> non-OD  BHA4124    SN6155/19     980???
> OD      BHA4126    SN6155/21    1080???
> 
> When fitting a 3.54:1 rear end to an overdrive equipped car, does the non-OD speedometer have the correct calibration?  I think that it would if the gear ratios for the speedometer takeoffs on the extension housing of the non-OD gearbox and on the overdrive were the same.  If not, what calibration (TPM) have folks used?
> 
> Cheers,
> 
> Bob Haskell
> AHCA 3000 MkI registrar
> http://www.ciahc.org/registry_3000mk1.php
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---

From: HealeyRick <[email-masked]>
Date: Sun, 4 Dec 2016 21:19:54 -0500

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--94eb2c05d26c66bbf40542dfec18

My Nasty Boy has a Lempert rear, a Ford T5 transmission and a stock Healey
speedometer.  I made a couple of attempts to get them to play together that
were unsuccessful.  I saw on another forum a GPS driven unit that would
allow me to use my stock speedo and I became a beta tester (full disclosure
I get a free unit for being a beta tester)  They are now in full production
and the Classic Speed is now available for sale:
http://www.classicautoinnovations.com/classic.  I'm very happy with it and
solves the problem  of running different non-stock rear ends and
transmissions.

Happy Healeydays,
Rick Neville

On Sun, Dec 4, 2016 at 4:34 PM, Bluehealey <[email-masked]> wrote:

> Hi Bob.
> For what it's worth I have found that 1152TPM is the closest calibration I
> could get to suit the set up on Bluehealey.  I have a 3.54 Lempert diff on
> overdrive box with 180XAS Michelins. Rolling radius of those I found to be
> 312mm (12.3").
> The set up uses a 32tooth worm wheel and 36 tooth Odo wheel.  The
> displayed mileage and actual mileage are pretty close and have been checked
> over a few hundred miles against a Sat Nav. Error is about 1-2%.
> Speedo calibration is all over the place. I just moved the needle,
> relative to the drive cup, until 60mph matches my sat nav display.  All
> other speeds above and below will be off a margin.
> > What's the thickness of the washer that is fitted between the gearbox
> and the right angle drive (PN 3H550 or Moss PN 324-720)?
> >
> > There are two MPH speedometers fitted to the 3000 MkI and MkII; one for
> overdrive and one for non-overdrive cars.  What's the speedometer
> calibration (turns per mile) for each?
> >
> >        BMC P/N    Smiths P/N   TPM
> > When fitting a 3.54:1 rear end to an overdrive equipped car, does the
> non-OD speedometer have the correct calibration?  I think that it would if
> the gear ratios for the speedometer takeoffs on the extension housing of
> the non-OD gearbox and on the overdrive were the same.  If not, what
> calibration (TPM) have folks used?
> >
> > Cheers,
> >
> > Bob Haskell
> > AHCA 3000 MkI registrar
> Unsubscribe/Manage: http://autox.team.net/mailman/
> options/healeys/[email-masked]
>
>

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<div dir=3D"ltr">My Nasty Boy has a Lempert rear, a Ford T5 transmission an=
d a stock Healey speedometer.=C2=A0 I made a couple of attempts to get them=
 to play together that were unsuccessful.=C2=A0 I saw on another forum a GP=
S driven unit that would allow me to use my stock speedo and I became a bet=
a tester (full disclosure I get a free unit for being a beta tester) =C2=A0=
They are now in full production and the Classic Speed is now available for =
sale: =C2=A0<a href=3D"http://www.classicautoinnovations.com/classic">http:=
//www.classicautoinnovations.com/classic</a>.=C2=A0 I&#39;m very happy with=
 it and solves the problem =C2=A0of running different non-stock rear ends a=
nd transmissions.<div><br></div><div>Happy Healeydays,</div><div>Rick Nevil=
le</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On =
Sun, Dec 4, 2016 at 4:34 PM, Bluehealey <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:[email-masked]" target=3D"_blank">[email-masked]</a>&gt;</=
span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex">Hi Bob.<br>
For what it&#39;s worth I have found that 1152TPM is the closest calibratio=
n I could get to suit the set up on Bluehealey.=C2=A0 I have a 3.54 Lempert=
 diff on overdrive box with 180XAS Michelins. Rolling radius of those I fou=
nd to be 312mm (12.3&quot;).<br>
The set up uses a 32tooth worm wheel and 36 tooth Odo wheel.=C2=A0 The disp=
layed mileage and actual mileage are pretty close and have been checked ove=
r a few hundred miles against a Sat Nav. Error is about 1-2%.<br>
Your tyres will be the only variable with my arrangement.<br>
Speedo calibration is all over the place. I just moved the needle, relative=
 to the drive cup, until 60mph matches my sat nav display.=C2=A0 All other =
speeds above and below will be off a margin.<br>
Give me your rolling radius of the tyres and I will be able to provide the =
best Turns per mile sett up.<br>
Enjoy.<br>
<br>
Alan - from my iPad<br>
<br>
&gt; On 4 Dec 2016, at 19:32, Bob Haskell &lt;<a href=3D"mailto:rchaskell@e=
arthlink.net">[email-masked]</a>&gt; wrote:<br>
&gt;<br>
&gt; Listers,<br>
&gt;<br>
&gt; What&#39;s the thickness of the washer that is fitted between the gear=
box and the right angle drive (PN 3H550 or Moss PN 324-720)?<br>
&gt;<br>
&gt; There are two MPH speedometers fitted to the 3000 MkI and MkII; one fo=
r overdrive and one for non-overdrive cars.=C2=A0 What&#39;s the speedomete=
r calibration (turns per mile) for each?<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 BMC P/N=C2=A0 =C2=A0 Smiths P/N=C2=A0 =C2=
=A0TPM<br>
&gt; non-OD=C2=A0 BHA4124=C2=A0 =C2=A0 SN6155/19=C2=A0 =C2=A0 =C2=A0980???<=
br>
&gt; OD=C2=A0 =C2=A0 =C2=A0 BHA4126=C2=A0 =C2=A0 SN6155/21=C2=A0 =C2=A0 108=
0???<br>
&gt;<br>
&gt; When fitting a 3.54:1 rear end to an overdrive equipped car, does the =
non-OD speedometer have the correct calibration?=C2=A0 I think that it woul=
d if the gear ratios for the speedometer takeoffs on the extension housing =
of the non-OD gearbox and on the overdrive were the same.=C2=A0 If not, wha=
t calibration (TPM) have folks used?<br>
&gt;<br>
&gt; Cheers,<br>
&gt;<br>
&gt; Bob Haskell<br>
&gt; AHCA 3000 MkI registrar<br>
&gt; <a href=3D"http://www.ciahc.org/registry_3000mk1.php" rel=3D"noreferre=
r" target=3D"_blank">http://www.ciahc.org/registry_<wbr>3000mk1.php</a><br>
&gt; ______________________________<wbr>_________________<br>
&gt; Support Team.Net <a href=3D"http://www.team.net/donate.html" rel=3D"no=
referrer" target=3D"_blank">http://www.team.net/donate.<wbr>html</a><br>
&gt; Suggested annual donation=C2=A0 $12.75<br>
&gt; Archive: <a href=3D"http://www.team.net/archive" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.team.net/archive</a><br>
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et=3D"_blank">http://www.team.net/forums</a><br>
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r>
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</blockquote></div><br></div>

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From: "Roger Grace" <[email-masked]>
Date: Mon, 5 Dec 2016 09:05:22 -0800

I have the same rear end/tire set up as Alan.
After a rolling measurement get a requirement of 1113.62 speedo TPM
Because of this issue (and my neurosis about accurate instrumentation ! ),
have just installed a stepper motor style digital speedo. This is a near
exact replica of the original Smiths as fitted to the BJ8 with blue high 
beam indication,
same fonts etc. Only major difference is that the ODO/Trip is now a small 
LCD; it and needle is driven by a pulse transducer that you install by 
cutting the speedo cable; easy to make TPM mods.
Most people don't notice the difference at first glance.
Could post a pix if anyone is interested.
rg

-----Original Message----- 
From: Bluehealey
Sent: Sunday, December 4, 2016 1:34 PM
To: Bob Haskell
Cc: Healey List
Subject: Re: [Healeys] speedo questions

Hi Bob.
For what it's worth I have found that 1152TPM is the closest calibration I
could get to suit the set up on Bluehealey.  I have a 3.54 Lempert diff on
overdrive box with 180XAS Michelins. Rolling radius of those I found to be
312mm (12.3").
The set up uses a 32tooth worm wheel and 36 tooth Odo wheel.  The displayed
mileage and actual mileage are pretty close and have been checked over a few
hundred miles against a Sat Nav. Error is about 1-2%.
Your tyres will be the only variable with my arrangement.
Speedo calibration is all over the place. I just moved the needle, relative
to the drive cup, until 60mph matches my sat nav display.  All other speeds
above and below will be off a margin.
Give me your rolling radius of the tyres and I will be able to provide the
best Turns per mile sett up.
Enjoy.

Alan - from my iPad

> What's the thickness of the washer that is fitted between the gearbox and
> the right angle drive (PN 3H550 or Moss PN 324-720)?
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/[email-masked]
>

[email-masked]

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