Subject: Re: [TR] RPM speed calc

From: John Macartney <[email-masked]>
Date: Mon, 1 Jun 2020 20:24:50 +0100

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It=E2=80=99s important to remember that cars without overdrive had a higher a=
xle ratio than those with it. As an example, the GT6+ had a 3.27 final drive=
 for non overdrive and 3.89 for overdrive. Just to complicate things, it was=
 entirely possible to order a 3.27 diff with overdrive on top! The factory n=
ever promoted this facility for fairly obvious reasons. My own GT6 mk 2 was s=
upplied like that becxause I knew my way around the factory build books. Iit=
 made an excellent cruiser with good fuel consumption but could not pull mor=
e than 4000 rpm, even downhill on a motorway. That said, refuelling was a li=
ttle less frequent.

Jonmac

At the Battle of Waterloo, 1815:
Lord Uxbridge:  =E2=80=9CBy God, Sir - I=E2=80=99ve lost my leg=E2=80=9D
Duke of Wellington: =E2=80=9CBy God, Sir - so you have!=E2=80=9D

> On 1 Jun 2020, at 19:41, Dave MacKay <[email-masked]> wrote:
>=20
> >Date: Sun, 31 May 2020 16:52:23 -0500
> >From: bill beecher <[email-masked]>
> >Subject: [TR] RPM speed calc
> >=20
> >Came across this calculator with all the right input fields.  But, I wond=
er how accurate it really is given the following input.
> >TR3 with a 3.7 rear, OD at redline of 5,000rpm.  Vredestein 165R/15 tires=
, 25.4? diameter.   Should be moving along at 124mph!
> >=20
> >https://wahiduddin.net/calc/calc_speed_rpm.htm
> >=20
> >Anyone get a different answer?
> >Bill
> =20
> Here (attached) is a spreadsheet that I wrote to calculate speed versus rp=
m given different parameters. I wrote it to check my speedo after I installe=
d an HVDA transmission. If the spreadsheet doesn=E2=80=99t make it through t=
he list as an attachment, just e-mail me directly and I=E2=80=99ll send it t=
o you.
> =20
> With a standard Triumph gearbox + overdrive, and the parameters you gave, I=
 calculate speed at 5000 rpm in top gear (with overdrive) as being 124.5 mph=
. Note that, I think that the tire diameter is 25.25=E2=80=9D, slightly less=
 than you indicated.
> =20
> I hasten to add that calculating a speed and believing it=E2=80=99s achiev=
able are two different things!
> =20
> Regards,
> =20
> Dave MacKay
> 1960 TR3A s/n 68639L
> near Toronto, Canada
> <Triumph rpm to mph.xls>
> ** [email-masked] **
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archi=
ve
>=20
> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/john.ma=
[email-masked]

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">It=E2=80=99s important to remember that car=
s without overdrive had a higher axle ratio than those with it. As an exampl=
e, the GT6+ had a 3.27 final drive for non overdrive and 3.89 for overdrive.=
 Just to complicate things, it was entirely possible to order a 3.27 diff wi=
th overdrive on top! The factory never promoted this facility for fairly obv=
ious reasons. My own GT6 mk 2 was supplied like that becxause I knew my way a=
round the factory build books. Iit made an excellent cruiser with good fuel c=
onsumption but could not pull more than 4000 rpm, even downhill on a motorwa=
y. That said, refuelling was a little less frequent.<div><br></div><div>Jonm=
ac<br><br><div id=3D"AppleMailSignature" dir=3D"ltr">At the Battle of Waterl=
oo, 1815:<div>Lord Uxbridge: &nbsp;=E2=80=9CBy God, Sir - I=E2=80=99ve lost m=
y leg=E2=80=9D</div><div>Duke of Wellington: =E2=80=9CBy God, Sir - so you h=
ave!=E2=80=9D</div><div><br></div></div><div dir=3D"ltr"><br>On 1 Jun 2020, a=
t 19:41, Dave MacKay &lt;<a href=3D"mailto:[email-masked]">[email-masked]=
a</a>&gt; wrote:<br><br></div><blockquote type=3D"cite"><div dir=3D"ltr"><me=
ta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8"><meta n=
ame=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)"><style><!-=
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--></style><div class=3D"WordSection1"><p class=3D"MsoPlainText">&gt;Date: S=
un, 31 May 2020 16:52:23 -0500</p><p class=3D"MsoPlainText">&gt;From: bill b=
eecher &lt;<a href=3D"mailto:[email-masked]">[email-masked]</a>&=
gt;</p><p class=3D"MsoPlainText">&gt;Subject: [TR] RPM speed calc</p><p clas=
s=3D"MsoPlainText">&gt;&nbsp;</p><p class=3D"MsoPlainText">&gt;Came across t=
his calculator with all the right input fields.&nbsp; But, I wonder how accu=
rate it really is given the following input. </p><p class=3D"MsoPlainText">&=
gt;TR3 with a 3.7 rear, OD at redline of 5,000rpm.&nbsp; Vredestein 165R/15 t=
ires, 25.4? diameter.&nbsp;&nbsp; Should be moving along at 124mph!</p><p cl=
ass=3D"MsoPlainText">&gt;&nbsp;</p><p class=3D"MsoPlainText">&gt;<a href=3D"=
https://wahiduddin.net/calc/calc_speed_rpm.htm">https://wahiduddin.net/calc/=
calc_speed_rpm.htm</a></p><p class=3D"MsoPlainText">&gt;&nbsp;</p><p class=3D=
"MsoPlainText">&gt;Anyone get a different answer? </p><p class=3D"MsoPlainTe=
xt">&gt;Bill</p><p class=3D"MsoNormal">&nbsp;</p><p class=3D"MsoNormal">Here=
 (attached) is a spreadsheet that I wrote to calculate speed versus rpm give=
n different parameters. I wrote it to check my speedo after I installed an H=
VDA transmission. If the spreadsheet doesn=E2=80=99t make it through the lis=
t as an attachment, just e-mail me directly and I=E2=80=99ll send it to you.=
</p><p class=3D"MsoNormal">&nbsp;</p><p class=3D"MsoNormal">With a standard T=
riumph gearbox + overdrive, and the parameters you gave, I calculate speed a=
t 5000 rpm in top gear (with overdrive) as being 124.5 mph. Note that, I thi=
nk that the tire diameter is 25.25=E2=80=9D, slightly less than you indicate=
d.</p><p class=3D"MsoNormal">&nbsp;</p><p class=3D"MsoNormal">I hasten to ad=
d that calculating a speed and believing it=E2=80=99s achievable are two dif=
ferent things!</p><p class=3D"MsoNormal">&nbsp;</p><p class=3D"MsoNormal">Re=
gards,</p><p class=3D"MsoNormal">&nbsp;</p><p class=3D"MsoNormal">Dave MacKa=
y</p><p class=3D"MsoNormal">1960 TR3A s/n 68639L</p><p class=3D"MsoNormal">n=
ear Toronto, Canada</p></div>
</div></blockquote><blockquote type=3D"cite"><div dir=3D"ltr">&lt;Triumph rp=
m to mph.xls&gt;</div></blockquote><blockquote type=3D"cite"><div dir=3D"ltr=
"><span>** <a href=3D"mailto:[email-masked]">[email-masked]=
t</a> **</span><br><span></span><br><span>Donate: <a href=3D"http://www.team=
.net/donate.html">http://www.team.net/donate.html</a></span><br><span>Archiv=
e: <a href=3D"http://www.team.net/pipermail/triumphs">http://www.team.net/pi=
permail/triumphs</a> &nbsp;<a href=3D"http://www.team.net/archive">http://ww=
w.team.net/archive</a></span><br><span></span><br><span>Unsubscribe/Manage: <=
a href=3D"http://autox.team.net/mailman/options/triumphs/john.macartney@ukpi=
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ips.org.uk</a></span><br></div></blockquote></div></body></html>=

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** [email-masked] **

Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive

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---

From: DAVID MASSEY <[email-masked]>
Date: Mon, 1 Jun 2020 20:36:11 +0000 (UTC)

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 That is true for cars that remain equipped as delivered.=C2=A0 However, ma=
ny or most TR's were delivered without overdrive and many of us have since =
fitted overdrive transmission to our cars whilst keeping the stock (non-OD)=
 differential.=C2=A0=20

I guess the short answer is: your mileage may vary.
Cheers
=20
Dave=20

=20
=20
-----Original Message-----
From: John Macartney <[email-masked]>
To: Dave MacKay <[email-masked]>
Cc: [email-masked]
Sent: Mon, Jun 1, 2020 2:24 pm
Subject: Re: [TR] RPM speed calc

It=E2=80=99s important to remember that cars without overdrive had a higher=
 axle ratio than those with it. As an example, the GT6+ had a 3.27 final dr=
ive for non overdrive and 3.89 for overdrive. Just to complicate things, it=
 was entirely possible to order a 3.27 diff with overdrive on top! The fact=
ory never promoted this facility for fairly obvious reasons. My own GT6 mk =
2 was supplied like that becxause I knew my way around the factory build bo=
oks. Iit made an excellent cruiser with good fuel consumption but could not=
 pull more than 4000 rpm, even downhill on a motorway. That said, refuellin=
g was a little less frequent.
Jonmac

At the Battle of Waterloo, 1815:Lord Uxbridge: =C2=A0=E2=80=9CBy God, Sir -=
 I=E2=80=99ve lost my leg=E2=80=9DDuke of Wellington: =E2=80=9CBy God, Sir =
- so you have!=E2=80=9D

#yiv9085228339 #yiv9085228339 -- _filtered {} _filtered {}#yiv9085228339 #y=
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:sans-serif;} _filtered {}#yiv9085228339 div.yiv9085228339WordSection1 {}#y=
iv9085228339 >Date: Sun, 31 May 2020 16:52:23 -0500>From: bill beecher <not=
[email-masked]>>Subject: [TR] RPM speed calc>=C2=A0>Came across this cal=
culator with all the right input fields.=C2=A0 But, I wonder how accurate i=
t really is given the following input. >TR3 with a 3.7 rear, OD at redline =
of 5,000rpm.=C2=A0 Vredestein 165R/15 tires, 25.4? diameter.=C2=A0=C2=A0 Sh=
ould be moving along at 124mph!>=C2=A0>https://wahiduddin.net/calc/calc_spe=
ed_rpm.htm>=C2=A0>Anyone get a different answer? >Bill=C2=A0Here (attached)=
 is a spreadsheet that I wrote to calculate speed versus rpm given differen=
t parameters. I wrote it to check my speedo after I installed an HVDA trans=
mission. If the spreadsheet doesn=E2=80=99t make it through the list as an =
attachment, just e-mail me directly and I=E2=80=99ll send it to you.=C2=A0W=
ith a standard Triumph gearbox + overdrive, and the parameters you gave, I =
calculate speed at 5000 rpm in top gear (with overdrive) as being 124.5 mph=
. Note that, I think that the tire diameter is 25.25=E2=80=9D, slightly les=
s than you indicated.=C2=A0I hasten to add that calculating a speed and bel=
ieving it=E2=80=99s achievable are two different things!=C2=A0Regards,=C2=
=A0Dave MacKay1960 TR3A s/n 68639Lnear Toronto, Canada
<Triumph rpm to mph.xls>

Archive: http://www.team.net/pipermail/triumphs =C2=A0http://www.team.net/a=
rchive

[email-masked]

Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archiv=
e

[email-masked]

------=_Part_745396_1496847857.1591043771599
Content-Transfer-Encoding: quoted-printable

<div style=3D"color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"3">That is true for cars that remain equipped as delive=
red.&nbsp; However, many or most TR's were delivered without overdrive and =
many of us have since fitted overdrive transmission to our cars whilst keep=
ing the stock (non-OD) differential.&nbsp; <br>
</font></div>

<div><font size=3D"3"><br>
</font></div>

<div><font size=3D"3">I guess the short answer is: your mileage may vary.</=
font></div>

<div><font size=3D"3"><br>
</font></div>

<div><font size=3D"3">Cheers</font><br>
</div>

<div> <br>
</div>

<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: John Macartney &lt;[email-masked]&gt;<br>
To: Dave MacKay &lt;[email-masked]&gt;<br>
Cc: [email-masked]<br>
Sent: Mon, Jun 1, 2020 2:24 pm<br>
Subject: Re: [TR] RPM speed calc<br>
<br>

<div id=3D"yiv9085228339">
<div>It=E2=80=99s important to remember that cars without overdrive had a h=
igher axle ratio than those with it. As an example, the GT6+ had a 3.27 fin=
al drive for non overdrive and 3.89 for overdrive. Just to complicate thing=
s, it was entirely possible to order a 3.27 diff with overdrive on top! The=
 factory never promoted this facility for fairly obvious reasons. My own GT=
6 mk 2 was supplied like that becxause I knew my way around the factory bui=
ld books. Iit made an excellent cruiser with good fuel consumption but coul=
d not pull more than 4000 rpm, even downhill on a motorway. That said, refu=
elling was a little less frequent.
<div><br clear=3D"none"></div>

<div>Jonmac<br clear=3D"none"><br clear=3D"none">
<div dir=3D"ltr" id=3D"yiv9085228339AppleMailSignature">At the Battle of Wa=
terloo, 1815:
<div>Lord Uxbridge: &nbsp;=E2=80=9CBy God, Sir - I=E2=80=99ve lost my leg=
=E2=80=9D</div>

<div>Duke of Wellington: =E2=80=9CBy God, Sir - so you have!=E2=80=9D</div>

<div><br clear=3D"none"></div>
</div>

<div class=3D"yiv9085228339yqt6140383728" id=3D"yiv9085228339yqt63103">
<div dir=3D"ltr"><br clear=3D"none">On 1 Jun 2020, at 19:41, Dave MacKay &l=
t;<a rel=3D"nofollow" shape=3D"rect" ymailto=3D"mailto:[email-masked]" ta=
rget=3D"_blank" href=3D"mailto:[email-masked]">[email-masked]</a>&gt; w=
rote:<br clear=3D"none"><br clear=3D"none"></div>
<blockquote type=3D"cite">
<div dir=3D"ltr"></div>
</blockquote></div>
</div>
</div>

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<div class=3D"yiv9085228339WordSection1">
<div class=3D"yiv9085228339MsoPlainText">&gt;Date: Sun, 31 May 2020 16:52:2=
3 -0500</div>

<div class=3D"yiv9085228339MsoPlainText">&gt;From: bill beecher &lt;<a rel=
=3D"nofollow" shape=3D"rect" ymailto=3D"mailto:[email-masked]" target=
=3D"_blank" href=3D"mailto:[email-masked]">[email-masked]</a>&g=
t;</div>

<div class=3D"yiv9085228339MsoPlainText">&gt;Subject: [TR] RPM speed calc</=
div>

<div class=3D"yiv9085228339MsoPlainText">&gt;&nbsp;</div>

<div class=3D"yiv9085228339MsoPlainText">&gt;Came across this calculator wi=
th all the right input fields.&nbsp; But, I wonder how accurate it really i=
s given the following input. </div>

<div class=3D"yiv9085228339MsoPlainText">&gt;TR3 with a 3.7 rear, OD at red=
line of 5,000rpm.&nbsp; Vredestein 165R/15 tires, 25.4? diameter.&nbsp;&nbs=
p; Should be moving along at 124mph!</div>

<div class=3D"yiv9085228339MsoPlainText">&gt;&nbsp;</div>

<div class=3D"yiv9085228339MsoPlainText">&gt;<a rel=3D"nofollow" shape=3D"r=
ect" target=3D"_blank" href=3D"https://wahiduddin.net/calc/calc_speed_rpm.h=
tm">https://wahiduddin.net/calc/calc_speed_rpm.htm</a></div>

<div class=3D"yiv9085228339MsoPlainText">&gt;&nbsp;</div>

<div class=3D"yiv9085228339MsoPlainText">&gt;Anyone get a different answer?=
 </div>

<div class=3D"yiv9085228339MsoPlainText">&gt;Bill</div>

<div class=3D"yiv9085228339MsoNormal">&nbsp;</div>

<div class=3D"yiv9085228339MsoNormal">Here (attached) is a spreadsheet that=
 I wrote to calculate speed versus rpm given different parameters. I wrote =
it to check my speedo after I installed an HVDA transmission. If the spread=
sheet doesn=E2=80=99t make it through the list as an attachment, just e-mai=
l me directly and I=E2=80=99ll send it to you.</div>

<div class=3D"yiv9085228339MsoNormal">&nbsp;</div>

<div class=3D"yiv9085228339MsoNormal">With a standard Triumph gearbox + ove=
rdrive, and the parameters you gave, I calculate speed at 5000 rpm in top g=
ear (with overdrive) as being 124.5 mph. Note that, I think that the tire d=
iameter is 25.25=E2=80=9D, slightly less than you indicated.</div>

<div class=3D"yiv9085228339MsoNormal">&nbsp;</div>

<div class=3D"yiv9085228339MsoNormal">I hasten to add that calculating a sp=
eed and believing it=E2=80=99s achievable are two different things!</div>

<div class=3D"yiv9085228339MsoNormal">&nbsp;</div>

<div class=3D"yiv9085228339MsoNormal">Regards,</div>

<div class=3D"yiv9085228339MsoNormal">&nbsp;</div>

<div class=3D"yiv9085228339MsoNormal">Dave MacKay</div>

<div class=3D"yiv9085228339MsoNormal">1960 TR3A s/n 68639L</div>

<div class=3D"yiv9085228339MsoNormal">near Toronto, Canada</div>
</div>

<blockquote type=3D"cite">
<div dir=3D"ltr">&lt;Triumph rpm to mph.xls&gt;</div>
</blockquote><blockquote type=3D"cite">
<div dir=3D"ltr"><span>** <a rel=3D"nofollow" shape=3D"rect" ymailto=3D"mai=
lto:[email-masked]" target=3D"_blank" href=3D"mailto:triumphs@auto=
x.team.net">[email-masked]</a> **</span><br clear=3D"none"><span><=
/span><br clear=3D"none"><span>Donate: <a rel=3D"nofollow" shape=3D"rect" t=
arget=3D"_blank" href=3D"http://www.team.net/donate.html">http://www.team.n=
et/donate.html</a></span><br clear=3D"none"><span>Archive: <a rel=3D"nofoll=
ow" shape=3D"rect" target=3D"_blank" href=3D"http://www.team.net/pipermail/=
triumphs">http://www.team.net/pipermail/triumphs</a> &nbsp;<a rel=3D"nofoll=
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From: TERRY SMITH <[email-masked]>
Date: Mon, 1 Jun 2020 17:48:30 -0400 (EDT)

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For the longest time I was confused.  ...Okay, several decades for those wh=
o are critical about exactness....

I was running an OD in my '3 and the speedometer read 80 mph.  I forget the=
 rpms.  3 or 3.5 thereabouts.  Yet traffic on Hwy 93 still passed me by, de=
spite that they didn't when I was driving 80 mph in my Tacoma. =20

Discovery came when I'd rigged a electrical charger in the'3 so my wife can=
 take her phone, then used it for my GPS on a Craigslist trip out of town. =
 And lo and behold, when the car's speedometer said "80," the GPS rebutted =
saying "73" or thereabouts instead mph.  For whatever it means, I gather I =
have a 4 speed differential leftover from when I swapped the 4 speed for an=
 OD. =20

I've decided it doesn't matter all that much to me.  The real win is that t=
he '59 TR3A is a now 61 year-old 4 cylinder car that can keep up with moder=
n traffic.  If I wanted to run a true '80' mph, I could without much diffic=
ulty. =20

Actual question here:  How many other cars from that vintage can keep up wi=
th traffic?  Talking your basic 4 cylinders here.  I'm particularly interes=
ted in the Porsche 356.  Didn't it come stock with a 1600 cc engine?

Terry Smith, '59 TR3A  TS 58667
New Hampshire

> On June 1, 2020 at 3:24 PM John Macartney <[email-masked]> =
wrote:
>=20
>     It=E2=80=99s important to remember that cars without overdrive had a =
higher axle ratio than those with it. As an example, the GT6+ had a 3.27 fi=
nal drive for non overdrive and 3.89 for overdrive. Just to complicate thin=
gs, it was entirely possible to order a 3.27 diff with overdrive on top! Th=
e factory never promoted this facility for fairly obvious reasons. My own G=
T6 mk 2 was supplied like that becxause I knew my way around the factory bu=
ild books. Iit made an excellent cruiser with good fuel consumption but cou=
ld not pull more than 4000 rpm, even downhill on a motorway. That said, ref=
uelling was a little less frequent.
>     Lord Uxbridge:  =E2=80=9CBy God, Sir - I=E2=80=99ve lost my leg=E2=80=
=9D
>     On 1 Jun 2020, at 19:41, Dave MacKay < [email-masked] mailto:dave@m=
dmackay.ca > wrote:
> >         >From: bill beecher <[email-masked] mailto:notakitcar@yah=
oo.com >
> >         >Came across this calculator with all the right input fields.  =
But, I wonder how accurate it really is given the following input.
> >=20
> >         >TR3 with a 3.7 rear, OD at redline of 5,000rpm.  Vredestein 16=
5R/15 tires, 25.4? diameter.   Should be moving along at 124mph!
> >         Here (attached) is a spreadsheet that I wrote to calculate spee=
d versus rpm given different parameters. I wrote it to check my speedo afte=
r I installed an HVDA transmission. If the spreadsheet doesn=E2=80=99t make=
 it through the list as an attachment, just e-mail me directly and I=E2=80=
=99ll send it to you.
> >=20
> >         =20
> >=20
> >         With a standard Triumph gearbox + overdrive, and the parameters=
 you gave, I calculate speed at 5000 rpm in top gear (with overdrive) as be=
ing 124.5 mph. Note that, I think that the tire diameter is 25.25=E2=80=9D,=
 slightly less than you indicated.
> >=20
> >         =20
> >=20
> >         I hasten to add that calculating a speed and believing it=E2=80=
=99s achievable are two different things!
> >=20
> >         =20
> >=20
> >         Regards,
> >=20
> >         =20
> >=20
> >         Dave MacKay
> >=20
> >         1960 TR3A s/n 68639L
> >=20
> >         near Toronto, Canada
> >=20
> >     >=20
>         > >         <Triumph rpm to mph.xls>
> >=20
> >     >=20
>         > >         ** [email-masked] mailto:[email-masked]=
.net **
> >         Archive: http://www.team.net/pipermail/triumphs   http://www.te=
am.net/archive
> >=20
> >         Unsubscribe/Manage: http://autox.team.net/mailman/options/trium=
phs/[email-masked]
>     Archive: http://www.team.net/pipermail/triumphs http://www.team.net/a=
rchive
>=20
>     Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/te=
[email-masked]

------=_Part_165950_208759249.1591048110801
Content-Transfer-Encoding: quoted-printable

<!doctype html>
<html>
 <head>=20
  <meta charset=3D"UTF-8">=20
 </head>
 <body>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   For the longest time I was confused.&nbsp; ...Okay, several decades for =
those who are critical about exactness....
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   <br>
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   I was running an OD in my '3 and the speedometer read 80 mph.&nbsp; I fo=
rget the rpms.&nbsp; 3 or 3.5 thereabouts.&nbsp; Yet traffic on Hwy 93 stil=
l passed me by, despite that they didn't when I was driving 80 mph in my Ta=
coma.&nbsp;&nbsp;
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   <br>
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   Discovery came when I'd rigged a electrical charger in the'3 so my wife =
can take her phone, then used it for my GPS on a Craigslist trip out of tow=
n.&nbsp; And lo and behold, when the car's speedometer said "80," the GPS r=
ebutted saying "73" or thereabouts instead mph.&nbsp; For whatever it means=
, I gather I have a 4 speed differential leftover from when I swapped the 4=
 speed for an OD.&nbsp;&nbsp;
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   <br>
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   I've decided it doesn't matter all that much to me.&nbsp; The real win i=
s that the '59 TR3A is a&nbsp;now 61 year-old 4 cylinder car that can keep =
up with modern traffic.&nbsp; If I wanted to run a true '80' mph, I could w=
ithout much difficulty.&nbsp;&nbsp;
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   <br>
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   Actual question here:&nbsp; How many other cars from that vintage can ke=
ep up with traffic?&nbsp; Talking your basic 4 cylinders here.&nbsp; I'm pa=
rticularly interested in the Porsche 356.&nbsp; Didn't it come stock with a=
 1600 cc engine?
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   <br>
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   Terry Smith, '59 TR3A&nbsp; TS 58667
  </div>
  <div style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">
   New Hampshire
  </div>
  <blockquote type=3D"cite">
   On June 1, 2020 at 3:24 PM John Macartney &lt;[email-masked].=
uk&gt; wrote:=20
   <br>=20
   <br> It=E2=80=99s important to remember that cars without overdrive had =
a higher axle ratio than those with it. As an example, the GT6+ had a 3.27 =
final drive for non overdrive and 3.89 for overdrive. Just to complicate th=
ings, it was entirely possible to order a 3.27 diff with overdrive on top! =
The factory never promoted this facility for fairly obvious reasons. My own=
 GT6 mk 2 was supplied like that becxause I knew my way around the factory =
build books. Iit made an excellent cruiser with good fuel consumption but c=
ould not pull more than 4000 rpm, even downhill on a motorway. That said, r=
efuelling was a little less frequent.
   <div>
    <br>
   </div>
   <div>
    Jonmac=20
    <br>=20
    <br>
    <div dir=3D"ltr" id=3D"ox-2aacd3f368-AppleMailSignature">
     At the Battle of Waterloo, 1815:
     <div>
      Lord Uxbridge: &nbsp;=E2=80=9CBy God, Sir - I=E2=80=99ve lost my leg=
=E2=80=9D
     </div>
     <div>
      Duke of Wellington: =E2=80=9CBy God, Sir - so you have!=E2=80=9D
     </div>
     <div>
      <br>
     </div>
    </div>
    <div dir=3D"ltr">
     <br>On 1 Jun 2020, at 19:41, Dave MacKay &lt;=20
     <a href=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote:=20
     <br>=20
     <br>
    </div>
    <blockquote type=3D"cite">
     <div dir=3D"ltr">
      <div class=3D"ox-2aacd3f368-WordSection1">
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;Date: Sun, 31 May 2020 1=
6:52:23 -0500</p>
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;From: bill beecher &lt;<=
a href=3D"mailto:[email-masked]">[email-masked]</a>&gt;</p>
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;Subject: [TR] RPM speed =
calc</p>
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;&nbsp;</p>
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;Came across this calcula=
tor with all the right input fields.&nbsp; But, I wonder how accurate it re=
ally is given the following input.</p>
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;TR3 with a 3.7 rear, OD =
at redline of 5,000rpm.&nbsp; Vredestein 165R/15 tires, 25.4? diameter.&nbs=
p;&nbsp; Should be moving along at 124mph!</p>
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;&nbsp;</p>
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;<a href=3D"https://wahid=
uddin.net/calc/calc_speed_rpm.htm">https://wahiduddin.net/calc/calc_speed_r=
pm.htm</a></p>
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;&nbsp;</p>
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;Anyone get a different a=
nswer?</p>
       <p class=3D"ox-2aacd3f368-MsoPlainText">&gt;Bill</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">&nbsp;</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">Here (attached) is a spreadshee=
t that I wrote to calculate speed versus rpm given different parameters. I =
wrote it to check my speedo after I installed an HVDA transmission. If the =
spreadsheet doesn=E2=80=99t make it through the list as an attachment, just=
 e-mail me directly and I=E2=80=99ll send it to you.</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">&nbsp;</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">With a standard Triumph gearbox=
 + overdrive, and the parameters you gave, I calculate speed at 5000 rpm in=
 top gear (with overdrive) as being 124.5 mph. Note that, I think that the =
tire diameter is 25.25=E2=80=9D, slightly less than you indicated.</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">&nbsp;</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">I hasten to add that calculatin=
g a speed and believing it=E2=80=99s achievable are two different things!</=
p>
       <p class=3D"ox-2aacd3f368-MsoNormal">&nbsp;</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">Regards,</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">&nbsp;</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">Dave MacKay</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">1960 TR3A s/n 68639L</p>
       <p class=3D"ox-2aacd3f368-MsoNormal">near Toronto, Canada</p>
      </div>
     </div>
    </blockquote>
    <blockquote type=3D"cite">
     <div dir=3D"ltr">
      &lt;Triumph rpm to mph.xls&gt;
     </div>
    </blockquote>
    <blockquote type=3D"cite">
     <div dir=3D"ltr">
      **=20
      <a href=3D"mailto:[email-masked]">[email-masked]</a=
> **=20
      <br>=20
      <br> Donate:=20
      <a href=3D"http://www.team.net/donate.html">http://www.team.net/donat=
e.html</a>=20
      <br> Archive:=20
      <a href=3D"http://www.team.net/pipermail/triumphs">http://www.team.ne=
t/pipermail/triumphs</a> &nbsp;
      <a href=3D"http://www.team.net/archive">http://www.team.net/archive</=
a>=20
      <br>=20
      <br> Unsubscribe/Manage:=20
      <a href=3D"http://autox.team.net/mailman/options/triumphs/john.macart=
[email-masked]">http://autox.team.net/mailman/options/triumphs/john.maca=
[email-masked]</a>=20
      <br>
     </div>
    </blockquote>
   </div>** [email-masked] **=20
   <br>=20
   <br>Donate: http://www.team.net/donate.html=20
   <br>Archive: http://www.team.net/pipermail/triumphs http://www.team.net/=
archive=20
   <br>=20
   <br>Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/t=
[email-masked]=20
   <br>
  </blockquote>
  <div style=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; c=
olor: #333333;" class=3D"default-style">
   <br>&nbsp;
  </div>=20
 </body>
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From: bill beecher <[email-masked]>
Date: Mon, 1 Jun 2020 17:34:17 -0500

--===============6908159825956084180==
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Thank you John, this is actually. Non-OD car with the 3.70 rear end.  OD ins=
talled later in life by some PO.  A very nice driving combo.=20

Bill

On Jun 1, 2020, at 2:36 PM, John Macartney <[email-masked]> wr=
ote:

=EF=BB=BFIt=E2=80=99s important to remember that cars without overdrive had a=
 higher axle ratio than those with it. As an example, the GT6+ had a 3.27 fi=
nal drive for non overdrive and 3.89 for overdrive. Just to complicate thing=
s, it was entirely possible to order a 3.27 diff with overdrive on top! The f=
actory never promoted this facility for fairly obvious reasons. My own GT6 m=
k 2 was supplied like that becxause I knew my way around the factory build b=
ooks. Iit made an excellent cruiser with good fuel consumption but could not=
 pull more than 4000 rpm, even downhill on a motorway. That said, refuelling=
 was a little less frequent.

Jonmac

ve
[email-masked]

Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive=

[email-masked]

--Apple-Mail-3344E6DF-FC94-4016-ACB5-33739F723EE2
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr">Thank you John, this is ac=
tually. Non-OD car with the 3.70 rear end. &nbsp;OD installed later in life b=
y some PO. &nbsp;A very nice driving combo.&nbsp;</div><div dir=3D"ltr"><br>=
</div><div dir=3D"ltr">Bill</div><div dir=3D"ltr"><br>On Jun 1, 2020, at 2:3=
6 PM, John Macartney &lt;[email-masked]&gt; wrote:<br><br></di=
v><div dir=3D"ltr">=EF=BB=BF<meta http-equiv=3D"content-type" content=3D"tex=
t/html; charset=3Dutf-8">It=E2=80=99s important to remember that cars withou=
t overdrive had a higher axle ratio than those with it. As an example, the G=
T6+ had a 3.27 final drive for non overdrive and 3.89 for overdrive. Just to=
 complicate things, it was entirely possible to order a 3.27 diff with overd=
rive on top! The factory never promoted this facility for fairly obvious rea=
sons. My own GT6 mk 2 was supplied like that becxause I knew my way around t=
he factory build books. Iit made an excellent cruiser with good fuel consump=
tion but could not pull more than 4000 rpm, even downhill on a motorway. Tha=
t said, refuelling was a little less frequent.<div><br></div><div>Jonmac<br>=
<br><div dir=3D"ltr">At the Battle of Waterloo, 1815:<div>Lord Uxbridge: &nb=
sp;=E2=80=9CBy God, Sir - I=E2=80=99ve lost my leg=E2=80=9D</div><div>Duke o=
f Wellington: =E2=80=9CBy God, Sir - so you have!=E2=80=9D</div><div><br></d=
iv></div><div dir=3D"ltr"><br>On 1 Jun 2020, at 19:41, Dave MacKay &lt;<a hr=
ef=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br><br></div>=
<blockquote type=3D"cite"><div dir=3D"ltr"><meta http-equiv=3D"Content-Type"=
 content=3D"text/html; charset=3Dutf-8"><meta name=3D"Generator" content=3D"=
Microsoft Word 15 (filtered medium)"><style><!--
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--></style><div class=3D"WordSection1"><p class=3D"MsoPlainText">&gt;Date: S=
un, 31 May 2020 16:52:23 -0500</p><p class=3D"MsoPlainText">&gt;From: bill b=
eecher &lt;<a href=3D"mailto:[email-masked]">[email-masked]</a>&=
gt;</p><p class=3D"MsoPlainText">&gt;Subject: [TR] RPM speed calc</p><p clas=
s=3D"MsoPlainText">&gt;&nbsp;</p><p class=3D"MsoPlainText">&gt;Came across t=
his calculator with all the right input fields.&nbsp; But, I wonder how accu=
rate it really is given the following input. </p><p class=3D"MsoPlainText">&=
gt;TR3 with a 3.7 rear, OD at redline of 5,000rpm.&nbsp; Vredestein 165R/15 t=
ires, 25.4? diameter.&nbsp;&nbsp; Should be moving along at 124mph!</p><p cl=
ass=3D"MsoPlainText">&gt;&nbsp;</p><p class=3D"MsoPlainText">&gt;<a href=3D"=
https://wahiduddin.net/calc/calc_speed_rpm.htm">https://wahiduddin.net/calc/=
calc_speed_rpm.htm</a></p><p class=3D"MsoPlainText">&gt;&nbsp;</p><p class=3D=
"MsoPlainText">&gt;Anyone get a different answer? </p><p class=3D"MsoPlainTe=
xt">&gt;Bill</p><p class=3D"MsoNormal">&nbsp;</p><p class=3D"MsoNormal">Here=
 (attached) is a spreadsheet that I wrote to calculate speed versus rpm give=
n different parameters. I wrote it to check my speedo after I installed an H=
VDA transmission. If the spreadsheet doesn=E2=80=99t make it through the lis=
t as an attachment, just e-mail me directly and I=E2=80=99ll send it to you.=
</p><p class=3D"MsoNormal">&nbsp;</p><p class=3D"MsoNormal">With a standard T=
riumph gearbox + overdrive, and the parameters you gave, I calculate speed a=
t 5000 rpm in top gear (with overdrive) as being 124.5 mph. Note that, I thi=
nk that the tire diameter is 25.25=E2=80=9D, slightly less than you indicate=
d.</p><p class=3D"MsoNormal">&nbsp;</p><p class=3D"MsoNormal">I hasten to ad=
d that calculating a speed and believing it=E2=80=99s achievable are two dif=
ferent things!</p><p class=3D"MsoNormal">&nbsp;</p><p class=3D"MsoNormal">Re=
gards,</p><p class=3D"MsoNormal">&nbsp;</p><p class=3D"MsoNormal">Dave MacKa=
y</p><p class=3D"MsoNormal">1960 TR3A s/n 68639L</p><p class=3D"MsoNormal">n=
ear Toronto, Canada</p></div>
</div></blockquote><blockquote type=3D"cite"><div dir=3D"ltr">&lt;Triumph rp=
m to mph.xls&gt;</div></blockquote><blockquote type=3D"cite"><div dir=3D"ltr=
"><span>** <a href=3D"mailto:[email-masked]">[email-masked]=
t</a> **</span><br><span></span><br><span>Donate: <a href=3D"http://www.team=
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From: bill beecher <[email-masked]>
Date: Mon, 1 Jun 2020 17:34:17 -0500

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Bill

Jonmac

ve
[email-masked]

[email-masked]

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From: Greg Lemon <[email-masked]>
Date: Mon, 1 Jun 2020 20:39:52 -0500

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"Actual question here:  How many other cars from that vintage can keep up
with traffic?  Talking your basic 4 cylinders here.  I'm particularly
interested in the Porsche 356.  Didn't it come stock with a 1600 cc engine?

Terry Smith,"

I have never owned one, but I have Road & Track's "On Porsche 1951-1967"

356s were built a long time in many flavors (though pales next to 911
variations).  Most were 1600 CC, early cars were 1500, late were two
liter.  Many different specs and HP.  But it looks like most all (similar
to air cooled VWs) had short lower gears and tall upper gears.  They also
had 15" wheels, and probably about the same size tires as early TRs.

Anyway, most all were geared between 19 and 21 miles per 1000 rpm, so
3500ish at 70.  Not bad, have never driven one, so can't say if they felt
relaxed or a little frenetic.  Probably relaxed by the small car standards
of the day, but frenetic compared to most any modern car.

Greg Lemon
TR250
J Type O/D
3.69 Nissan Diff

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<div dir=3D"auto"><div style=3D"font-size:12pt;font-family:helvetica,arial,=
sans-serif;color:rgb(51,51,51)" dir=3D"auto">&quot;Actual question here:=C2=
=A0 How many other cars from that vintage can keep up with traffic?=C2=A0 T=
alking your basic 4 cylinders here.=C2=A0 I&#39;m particularly interested i=
n the Porsche 356.=C2=A0 Didn&#39;t it come stock with a 1600 cc engine?</d=
iv><div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;colo=
r:rgb(51,51,51)" dir=3D"auto"><br></div><div style=3D"font-size:12pt;font-f=
amily:helvetica,arial,sans-serif;color:rgb(51,51,51)" dir=3D"auto">Terry Sm=
ith,&quot;</div><div style=3D"font-size:12pt;font-family:helvetica,arial,sa=
ns-serif;color:rgb(51,51,51)" dir=3D"auto"><br></div><div style=3D"font-siz=
e:12pt;font-family:helvetica,arial,sans-serif;color:rgb(51,51,51)" dir=3D"a=
uto">I have never owned one, but I have Road &amp; Track&#39;s &quot;On Por=
sche 1951-1967&quot;</div><div style=3D"font-size:12pt;font-family:helvetic=
a,arial,sans-serif;color:rgb(51,51,51)" dir=3D"auto"><br></div><div style=
=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color:rgb(51,51,5=
1)" dir=3D"auto">356s were built a long time in many flavors (though pales =
next to 911 variations).=C2=A0 Most were 1600 CC, early cars were 1500, lat=
e were two liter.=C2=A0 Many different specs and HP.=C2=A0 But it looks lik=
e most all (similar to air cooled VWs) had short lower gears and tall upper=
 gears.=C2=A0 They also had 15&quot; wheels, and probably about the same si=
ze tires as early TRs.=C2=A0=C2=A0</div><div style=3D"font-size:12pt;font-f=
amily:helvetica,arial,sans-serif;color:rgb(51,51,51)" dir=3D"auto"><br></di=
v><div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)" dir=3D"auto">Anyway, most all were geared between 19 and 21=
 miles per 1000 rpm, so 3500ish at 70.=C2=A0 Not bad, have never driven one=
, so can&#39;t say if they felt relaxed or a little frenetic.=C2=A0 Probabl=
y relaxed by the small car standards of the day, but frenetic compared to m=
ost any modern car.</div><div style=3D"font-size:12pt;font-family:helvetica=
,arial,sans-serif;color:rgb(51,51,51)" dir=3D"auto"><br></div><div style=3D=
"font-size:12pt;font-family:helvetica,arial,sans-serif;color:rgb(51,51,51)"=
 dir=3D"auto">Greg Lemon</div><div style=3D"font-size:12pt;font-family:helv=
etica,arial,sans-serif;color:rgb(51,51,51)" dir=3D"auto">TR250</div><div st=
yle=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color:rgb(51,5=
1,51)" dir=3D"auto">J Type O/D</div><div style=3D"font-size:12pt;font-famil=
y:helvetica,arial,sans-serif;color:rgb(51,51,51)" dir=3D"auto">3.69 Nissan =
Diff</div></div>

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