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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 <John.Macartney@Ukpips.org.uk> =
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.
>=20
> Jonmac
>=20
> 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
>=20
>=20
> On 1 Jun 2020, at 19:41, Dave MacKay < dave@mdmackay.ca mailto:dave@m=
dmackay.ca > wrote:
>=20
>=20
> > >=20
> > >Date: Sun, 31 May 2020 16:52:23 -0500
> >=20
> > >From: bill beecher <notakitcar@yahoo.com mailto:notakitcar@yah=
oo.com >
> >=20
> > >Subject: [TR] RPM speed calc
> >=20
> > >=20
> >=20
> > >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!
> >=20
> > >=20
> >=20
> > >https://wahiduddin.net/calc/calc_speed_rpm.htm
> >=20
> > >=20
> >=20
> > >Anyone get a different answer?
> >=20
> > >Bill
> >=20
> > =20
> >=20
> > 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
> > > ** triumphs@autox.team.net mailto:triumphs@autox.team=
.net **
> >=20
> > Donate: http://www.team.net/donate.html
> > Archive: http://www.team.net/pipermail/triumphs http://www.te=
am.net/archive
> >=20
> > Unsubscribe/Manage: http://autox.team.net/mailman/options/trium=
phs/john.macartney@ukpips.org.uk
> >=20
> > > ** triumphs@autox.team.net **
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs http://www.team.net/a=
rchive
>=20
> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/te=
rryrs@comcast.net
>=20
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<!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. ...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. I fo=
rget the rpms. 3 or 3.5 thereabouts. 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.
</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. And lo and behold, when the car's speedometer said "80," the GPS r=
ebutted 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.
</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. The real win i=
s that the '59 TR3A is a now 61 year-old 4 cylinder car that can keep =
up with modern traffic. If I wanted to run a true '80' mph, I could w=
ithout much difficulty.
</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: How many other cars from that vintage can ke=
ep up with traffic? Talking your basic 4 cylinders here. I'm pa=
rticularly interested in the Porsche 356. 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 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 <John.Macartney@Ukpips.org.=
uk> 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: =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 <=20
<a href=3D"mailto:dave@mdmackay.ca";>dave@mdmackay.ca</a>> 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">>Date: Sun, 31 May 2020 1=
6:52:23 -0500</p>
<p class=3D"ox-2aacd3f368-MsoPlainText">>From: bill beecher <<=
a href=3D"mailto:notakitcar@yahoo.com";>notakitcar@yahoo.com</a>></p>
<p class=3D"ox-2aacd3f368-MsoPlainText">>Subject: [TR] RPM speed =
calc</p>
<p class=3D"ox-2aacd3f368-MsoPlainText">> </p>
<p class=3D"ox-2aacd3f368-MsoPlainText">>Came across this calcula=
tor with all the right input fields. But, I wonder how accurate it re=
ally is given the following input.</p>
<p class=3D"ox-2aacd3f368-MsoPlainText">>TR3 with a 3.7 rear, OD =
at redline of 5,000rpm. Vredestein 165R/15 tires, 25.4? diameter.&nbs=
p; Should be moving along at 124mph!</p>
<p class=3D"ox-2aacd3f368-MsoPlainText">> </p>
<p class=3D"ox-2aacd3f368-MsoPlainText">><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">> </p>
<p class=3D"ox-2aacd3f368-MsoPlainText">>Anyone get a different a=
nswer?</p>
<p class=3D"ox-2aacd3f368-MsoPlainText">>Bill</p>
<p class=3D"ox-2aacd3f368-MsoNormal"> </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"> </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"> </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"> </p>
<p class=3D"ox-2aacd3f368-MsoNormal">Regards,</p>
<p class=3D"ox-2aacd3f368-MsoNormal"> </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">
<Triumph rpm to mph.xls>
</div>
</blockquote>
<blockquote type=3D"cite">
<div dir=3D"ltr">
**=20
<a href=3D"mailto:triumphs@autox.team.net";>triumphs@autox.team.net</a=
> **=20
<br>=20
<br> Donate:=20
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e.html</a>=20
<br> Archive:=20
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t/pipermail/triumphs</a>
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a>=20
<br>=20
<br> Unsubscribe/Manage:=20
<a href=3D"http://autox.team.net/mailman/options/triumphs/john.macart=
ney@ukpips.org.uk">http://autox.team.net/mailman/options/triumphs/john.maca=
rtney@ukpips.org.uk</a>=20
<br>
</div>
</blockquote>
</div>** triumphs@autox.team.net **=20
<br>=20
<br>Donate: http://www.team.net/donate.html=20
<br>Archive: http://www.team.net/pipermail/triumphs http://www.team.net/=
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</blockquote>
<div style=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; c=
olor: #333333;" class=3D"default-style">
<br>
</div>=20
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