--===============3081342380381708190==
--000000000000d72fc605c4e3faad
Content-Transfer-Encoding: quoted-printable
I have an GPS app on my cell phone that tells me what speed I am traveling.
I then look at my speedo and compare. Easy Peasy.
On Wed, Jun 16, 2021 at 12:03 AM Roger Grace via Healeys <
healeys@autox.team.net> wrote:
> I usually check by ensuring rear tires are at correct pressure, then
> making a mark on pavement at valve and counting say 8-10 turns then
> measuring distance carefully with a tape measure. Gives good results when
> doing the usual calculations. This takes the mystery out of data that the
> tire people publish.
> rg
>
>
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utm_campaign=3Dsig-email&utm_content=3Dwebmail> Virus-free.
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> <#m_-2716153344507356772_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
> On Sun, Jun 13, 2021 at 5:29 PM Harold Manifold via Healeys <
> healeys@autox.team.net> wrote:
>
>> The Tach is an accurate way to determine vehicle speed and can be more
>> accurate than the speedometer but you need to know these variables:
>>
>>
>>
>> Tires =E2=80=93 either Revs per Mile or loaded radius (this is different=
than the
>> nominal diameter and usually available on the tire manufacturers website=
)
>>
>> Rear End Ratio =E2=80=93 for a Healey there are limited options usually =
43/11 =3D
>> 3.91, 41/10 =3D 4.10 or 39/11 =3D 3.55
>>
>>
>>
>> If you do the check while driving in 4th without the overdrive engaged
>> the math is easier. One complication is the tire manufactures do not rep=
ort
>> Revs per Mile consistently and sometimes a conversion is required. Assum=
ing
>> Vredestein Sprint Classic 165HR15 and 4.10 rear end ratio this tab=
le
>> will work:
>>
>>
>>
>> MPH
>>
>> RPM
>>
>> 30
>>
>> 1,670
>>
>> 40
>>
>> 2,230
>>
>> 50
>>
>> 2,790
>>
>> 60
>>
>> 3,350
>>
>> 70
>>
>> 3,910
>>
>>
>>
>> if it would help anyone send me your tire make and size and rear end
>> ratio and I will sent a chart like the above.
>>
>>
>>
>> Harold
>>
>>
>>
>> *From: *banjojohn <banjojohn@cox.net>
>> *Sent: *Sunday, June 13, 2021 3:51 PM
>> *To: *Jim Ryan <ryan@jimryan.com>; i erbs <eyera3000@gmail.com>
>> *Cc: *Ahealey help <healeys@autox.team.net>
>> *Subject: *Re: [Healeys] Speed to RPM ratio?
>>
>>
>>
>> Jim, you are right. I have used GPS and my speedo is not accurate, but
>> close enough for me. My point was that the speedo is mechanically linke=
d,
>> from the tranny, to the engine, and my tach gets its signal from the coi=
l,
>> which also is directly linked to engine speed through the distributor.
>>
>> Regardless of my actual speed, my speedo and tach should maintain a
>> direct relationship in any given gear.
>>
>> Thanks again for all the opinions and various charts and facts provided
>> by the list members.
>>
>>
>>
>> John
>>
>>
>>
>>
>>
>> Sent from my T-Mobile 4G LTE Device
>>
>>
>>
>>
>>
>> -------- Original message --------
>>
>> From: Jim Ryan <ryan@jimryan.com>
>>
>> Date: 6/13/21 4:17 PM (GMT-06:00)
>>
>> To: i erbs <eyera3000@gmail.com>
>>
>> Cc: banjojohn <banjojohn@cox.net>, Ahealey help <healeys@autox.team.net>
>>
>> Subject: Re: [Healeys] Speed to RPM ratio?
>>
>>
>>
>> Am I missing something? I just check accuracy with the GPS on my phone.
>>
>>
>>
>> On Sun, Jun 13, 2021, 3:25 PM i erbs via Healeys <healeys@autox.team.net=
>
>> wrote:
>>
>> My tach is driven by my distributor gear
>>
>> Speedo comes off my transmission. Not sure about the relationship to
>> accuracy.
>>
>> Ira Erbs
>> 1959 AH 100-6
>> 1967 MGB
>> Milwaukie, OR
>>
>>
>>
>> On Sun, Jun 13, 2021, 11:50 AM banjojohn <banjojohn@cox.net> wrote:
>>
>> Thanks.
>>
>> I am actually just comparing the tach with the speedometer indicated
>> speed, which, I believe reads a little high due to tire size. But the
>> relationship between the indicated speed and the tach should be consista=
nt
>> since they are both driven by actual engine or output shaft speed.
>>
>>
>>
>> John
>>
>>
>>
>>
>>
>> Sent from my T-Mobile 4G LTE Device
>>
>>
>>
>>
>>
>> -------- Original message --------
>>
>> From: Bob Spidell via Healeys <healeys@autox.team.net>
>>
>> Date: 6/12/21 12:25 PM (GMT-06:00)
>>
>> To: Bob Haskell <rchaskell@earthlink.net>, healeys@autox.team.net
>>
>> Subject: Re: [Healeys] Speed to RPM ratio?
>>
>>
>>
>> That's it!
>>
>> On 6/11/2021 4:31 PM, Bob Haskell wrote:
>> > http://longstonetyres.co.uk
>> >
>> > Cheers,
>> >
>> > Bob Haskell
>> > Austin Healey 3000 BN7/BT7 registrar
>> >
>> > On 6/11/21 7:01 PM, Bob Spidell wrote:
>> >> Note there is a not insignificant difference in diameters of tires
>> >> with the same nominal size (e.g. '165/80-15'). The English tire
>> >> site--can't think of the name offhand--has (had?) a table comparing
>> >> the diameters of different brands/models of the same size tires, and
>> >> IIRC they could differ by as much as half an inch. I'd say to measure
>> >> the actual diameter of your tires, but it's kinda hard when moving;
>> >> the 'flat spot' goes away--partially, at least--and the tires 'grow'
>> >> some from centrifugal force (anyone seen film of top fuel dragsters
>> >> launching; the rear tires must expand a few inches or more?).
>> >>
>> >>
>> >> On 6/11/2021 3:36 PM, John OBrien wrote:
>> >>> Thanks to all who replied. These will give me something to work wit=
h.
>> >>>
>> >>> John
>> >>>
>> >>> On 6/11/2021 4:26 PM, John OBrien wrote:
>> >>>> Hi Guys and Gals
>> >>>>
>> >>>> I am trying to calibrate my tach. I installed a Spiyda RVI - RVC
>> >>>> conversion board, because my tach was acting wierd. Anyway, I am
>> >>>> still trying to get this setup to read correctly. My question is,
>> >>>> on my BJ8 with standard 3.9:1 diff. what should my RPMs be in
>> >>>> fourth gear going 50 MPH , without overdrive engaged. I'm running
>> >>>> 165/80R15 tires. I'm just looking for a reference point to compare
>> >>>> what should be, and what I am reading.
>> >>>>
>> >>>> Any help is appreciated.
>> >>>>
>> >>>> Thanks
>> >>>>
>> >>>> John
>> >>>>
>> >>
>>
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>>
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>>
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>> Suggested annual donation $12.75
>>
>> Archive: http://www.team.net/pipermail/healeys
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>>
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>>
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>>
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>>
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>>
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>>
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--000000000000d72fc605c4e3faad
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">I have an GPS app on my cell phone that tells me what spee=
d I am traveling. I then look at my speedo and compare.=C2=A0 Easy Peasy. <=
br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_att=
r">On Wed, Jun 16, 2021 at 12:03 AM Roger Grace via Healeys <<a href=3D"=
mailto:healeys@autox.team.net";>healeys@autox.team.net</a>> wrote:<br></d=
iv><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bord=
er-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div>=
I usually check by ensuring rear tires are at correct pressure, then making=
a mark on pavement at valve and counting say 8-10 turns then measuring dis=
tance carefully with a tape measure. Gives good results when doing the usua=
l calculations. This takes the mystery out of data that the tire people pub=
lish.<br></div><div>rg<br></div></div><div id=3D"gmail-m_-27161533445073567=
72DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
<table style=3D"border-top:1px solid rgb(211,212,222)">
<tbody><tr>
<td style=3D"width:55px;padding-top:13px"><a href=3D"http://www.avg=
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ign=3Dsig-email&utm_content=3Dwebmail" target=3D"_blank"><img src=3D"ht=
tps://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg-v1.png" al=
t=3D"" style=3D"width: 46px; height: 29px;" width=3D"46" height=3D"29"></a>=
</td>
<td
style=3D"width:470px;padding-top:12px;color:rgb(65,66,78);font-size:1=
3px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Virus-free. <a=
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</tr>
</tbody></table><a href=3D"#m_-2716153344507356772_DAB4FAD8-2DD7-40BB-A1B8-=
4E2AA1F9FDF2" width=3D"1" height=3D"1"></a></div><br><div class=3D"gmail_qu=
ote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Jun 13, 2021 at 5:29 PM =
Harold Manifold via Healeys <<a href=3D"mailto:healeys@autox.team.net"; t=
arget=3D"_blank">healeys@autox.team.net</a>> wrote:<br></div><blockquote=
class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex"><div lang=3D"EN-US"><div><p class=3D=
"MsoNormal">The Tach is an accurate way to determine vehicle speed and can =
be more accurate than the speedometer but you need to know these variables:=
</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">T=
ires =E2=80=93 either Revs per Mile or loaded radius (this is different tha=
n the nominal diameter and usually available on the tire manufacturers webs=
ite)</p><p class=3D"MsoNormal">Rear End Ratio =E2=80=93 for a Healey there =
are limited options usually 43/11 =3D 3.91, 41/10 =3D 4.10 or 39/11 =3D 3.5=
5</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">=
If you do the check while driving in 4<sup>th</sup> without the overdrive e=
ngaged the math is easier. One complication is the tire manufactures do not=
report Revs per Mile consistently and sometimes a conversion is required. =
Assuming =C2=A0Vredestein Sprint Classic=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 165H=
R15 and 4.10 rear end ratio this table will work:</p><p class=3D"MsoNormal"=
><u></u>=C2=A0<u></u></p><div><table style=3D"width:153pt;border-collapse:c=
ollapse" width=3D"204" cellspacing=3D"0" cellpadding=3D"0" border=3D"0"><tb=
ody><tr style=3D"height:12.75pt"><td style=3D"width:68pt;padding:0.75pt 0.7=
5pt 0in;height:12.75pt" width=3D"91" valign=3D"bottom" nowrap><p class=3D"M=
soNormal" style=3D"text-align:center" align=3D"center"><span style=3D"font-=
size:10pt;font-family:"Arial",sans-serif">MPH <u></u><u></u></spa=
n></p></td><td style=3D"width:85pt;padding:0.75pt 0.75pt 0in;height:12.75pt=
" width=3D"113" valign=3D"bottom" nowrap><p class=3D"MsoNormal" style=3D"te=
xt-align:center" align=3D"center"><span style=3D"font-size:10pt;font-family=
:"Arial",sans-serif">=C2=A0RPM <u></u><u></u></span></p></td></tr=
><tr style=3D"height:12.75pt"><td style=3D"padding:0.75pt 0.75pt 0in;height=
:12.75pt" valign=3D"bottom" nowrap><p class=3D"MsoNormal" style=3D"text-ali=
gn:center" align=3D"center"><span style=3D"font-size:10pt;font-family:"=
;Arial",sans-serif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A030 <u></u><u></u></span></p=
></td><td style=3D"padding:0.75pt 0.75pt 0in;height:12.75pt" valign=3D"bott=
om" nowrap><p class=3D"MsoNormal" style=3D"text-align:center" align=3D"cent=
er"><span style=3D"font-size:10pt;font-family:"Arial",sans-serif"=
>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A01,670 <u></u><u></u></span></p></td></t=
r><tr style=3D"height:12.75pt"><td style=3D"padding:0.75pt 0.75pt 0in;heigh=
t:12.75pt" valign=3D"bottom" nowrap><p class=3D"MsoNormal" style=3D"text-al=
ign:center" align=3D"center"><span style=3D"font-size:10pt;font-family:&quo=
t;Arial",sans-serif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A040 <u></u><u></u></span></p=
></td><td style=3D"padding:0.75pt 0.75pt 0in;height:12.75pt" valign=3D"bott=
om" nowrap><p class=3D"MsoNormal" style=3D"text-align:center" align=3D"cent=
er"><span style=3D"font-size:10pt;font-family:"Arial",sans-serif"=
>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A02,230 <u></u><u></u></span></p></td></t=
r><tr style=3D"height:12.75pt"><td style=3D"padding:0.75pt 0.75pt 0in;heigh=
t:12.75pt" valign=3D"bottom" nowrap><p class=3D"MsoNormal" style=3D"text-al=
ign:center" align=3D"center"><span style=3D"font-size:10pt;font-family:&quo=
t;Arial",sans-serif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A050 <u></u><u></u></span></p=
></td><td style=3D"padding:0.75pt 0.75pt 0in;height:12.75pt" valign=3D"bott=
om" nowrap><p class=3D"MsoNormal" style=3D"text-align:center" align=3D"cent=
er"><span style=3D"font-size:10pt;font-family:"Arial",sans-serif"=
>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A02,790 <u></u><u></u></span></p></td></t=
r><tr style=3D"height:12.75pt"><td style=3D"padding:0.75pt 0.75pt 0in;heigh=
t:12.75pt" valign=3D"bottom" nowrap><p class=3D"MsoNormal" style=3D"text-al=
ign:center" align=3D"center"><span style=3D"font-size:10pt;font-family:&quo=
t;Arial",sans-serif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A060 <u></u><u></u></span></p=
></td><td style=3D"padding:0.75pt 0.75pt 0in;height:12.75pt" valign=3D"bott=
om" nowrap><p class=3D"MsoNormal" style=3D"text-align:center" align=3D"cent=
er"><span style=3D"font-size:10pt;font-family:"Arial",sans-serif"=
>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A03,350 <u></u><u></u></span></p></td></t=
r><tr style=3D"height:12.75pt"><td style=3D"padding:0.75pt 0.75pt 0in;heigh=
t:12.75pt" valign=3D"bottom" nowrap><p class=3D"MsoNormal" style=3D"text-al=
ign:center" align=3D"center"><span style=3D"font-size:10pt;font-family:&quo=
t;Arial",sans-serif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A070 <u></u><u></u></span></p=
></td><td style=3D"padding:0.75pt 0.75pt 0in;height:12.75pt" valign=3D"bott=
om" nowrap><p class=3D"MsoNormal" style=3D"text-align:center" align=3D"cent=
er"><span style=3D"font-size:10pt;font-family:"Arial",sans-serif"=
>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A03,910 <u></u><u></u></span></p></td></t=
r></tbody></table></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p c=
lass=3D"MsoNormal">if it would help anyone send me your tire make and size =
and rear end ratio and I will sent a chart like the above.</p><p class=3D"M=
soNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Harold<u></u><u></=
u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div style=3D"border-c=
olor:rgb(225,225,225) currentcolor currentcolor;border-style:solid none non=
e;border-width:1pt medium medium;padding:3pt 0in 0in"><p class=3D"MsoNormal=
" style=3D"border:medium none;padding:0in"><b>From: </b><a href=3D"mailto:b=
anjojohn@cox.net" target=3D"_blank">banjojohn</a><br><b>Sent: </b>Sunday, J=
une 13, 2021 3:51 PM<br><b>To: </b><a href=3D"mailto:ryan@jimryan.com"; targ=
et=3D"_blank">Jim Ryan</a>; <a href=3D"mailto:eyera3000@gmail.com"; target=
=3D"_blank">i erbs</a><br><b>Cc: </b><a href=3D"mailto:healeys@autox.team.n=
et" target=3D"_blank">Ahealey help</a><br><b>Subject: </b>Re: [Healeys] Spe=
ed to RPM ratio?</p></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><d=
iv><p class=3D"MsoNormal">Jim, you are right.=C2=A0 I have used GPS and my =
speedo is not accurate, but close enough for me.=C2=A0 My point was that th=
e speedo is mechanically linked, from the tranny, to the engine, and my tac=
h gets its signal from the coil, which also is directly linked to engine sp=
eed through the distributor.=C2=A0=C2=A0<u></u><u></u></p></div><div><p cla=
ss=3D"MsoNormal">Regardless of my actual speed, my speedo and tach should m=
aintain a direct relationship in any given gear.<u></u><u></u></p></div><di=
v><p class=3D"MsoNormal">Thanks again for all the opinions and various char=
ts and facts provided by the list members.<u></u><u></u></p></div><div><p c=
lass=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal=
">John<u></u><u></u></p></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u><=
/u></p></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div=
id=3D"gmail-m_-2716153344507356772gmail-m_-4022733508395426119composer_sig=
nature"><div><p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;color:rg=
b(87,87,87)">Sent from my T-Mobile 4G LTE Device<u></u><u></u></span></p></=
div></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p=
class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNorm=
al"><span style=3D"color:black">-------- Original message --------<u></u><u=
></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"color:blac=
k">From: Jim Ryan <<a href=3D"mailto:ryan@jimryan.com"; target=3D"_blank"=
>ryan@jimryan.com</a>> <u></u><u></u></span></p></div><div><p class=3D"M=
soNormal"><span style=3D"color:black">Date: 6/13/21 4:17 PM (GMT-06:00) <u>=
</u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"colo=
r:black">To: i erbs <<a href=3D"mailto:eyera3000@gmail.com"; target=3D"_b=
lank">eyera3000@gmail.com</a>> <u></u><u></u></span></p></div><div><p cl=
ass=3D"MsoNormal"><span style=3D"color:black">Cc: banjojohn <<a href=3D"=
mailto:banjojohn@cox.net"; target=3D"_blank">banjojohn@cox.net</a>>, Ahea=
ley help <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">he=
aleys@autox.team.net</a>> <u></u><u></u></span></p></div><div><p class=
=3D"MsoNormal"><span style=3D"color:black">Subject: Re: [Healeys] Speed to =
RPM ratio? <u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span=
style=3D"color:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=
=3D"MsoNormal">Am I missing something?=C2=A0 I just check accuracy with the=
GPS on my phone.<u></u><u></u></p></div><p class=3D"MsoNormal"><u></u>=C2=
=A0<u></u></p><div><div><p class=3D"MsoNormal">On Sun, Jun 13, 2021, 3:25 P=
M i erbs via Healeys <<a href=3D"mailto:healeys@autox.team.net"; target=
=3D"_blank">healeys@autox.team.net</a>> wrote:<u></u><u></u></p></div><b=
lockquote style=3D"border-color:currentcolor currentcolor currentcolor rgb(=
204,204,204);border-style:none none none solid;border-width:medium medium m=
edium 1pt;padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in"><div>=
<p class=3D"MsoNormal">My tach is driven by my distributor gear<u></u><u></=
u></p><div><p class=3D"MsoNormal" style=3D"margin-bottom:12pt">Speedo comes=
off my transmission.=C2=A0 Not sure about the relationship to accuracy.=C2=
=A0<u></u><u></u></p><div><p class=3D"MsoNormal">Ira Erbs<br>1959 AH 100-6<=
br>1967 MGB<br>Milwaukie, OR<u></u><u></u></p></div></div></div><p class=3D=
"MsoNormal"><u></u>=C2=A0<u></u></p><div><div><p class=3D"MsoNormal">On Sun=
, Jun 13, 2021, 11:50 AM banjojohn <<a href=3D"mailto:banjojohn@cox.net"=
target=3D"_blank">banjojohn@cox.net</a>> wrote:<u></u><u></u></p></div>=
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
medium 1pt;padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in"><di=
v><div><p class=3D"MsoNormal">Thanks.<u></u><u></u></p></div><div><p class=
=3D"MsoNormal">I am actually just comparing the tach with the speedometer i=
ndicated speed, which, I believe reads a little high due to tire size.=C2=
=A0 But the relationship between the indicated speed and the tach should be=
consistant since they are both driven by actual engine or output shaft spe=
ed.<u></u><u></u></p></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u>=
</p></div><div><p class=3D"MsoNormal">John<u></u><u></u></p></div><div><p c=
lass=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal=
"><u></u>=C2=A0<u></u></p></div><div id=3D"gmail-m_-2716153344507356772gmai=
l-m_-4022733508395426119m_-8612040742838000386m_-7997059852725315655compose=
r_signature"><div><p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;col=
or:rgb(87,87,87)">Sent from my T-Mobile 4G LTE Device<u></u><u></u></span><=
/p></div></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><d=
iv><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"Ms=
oNormal"><span style=3D"color:black">-------- Original message --------<u><=
/u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"color=
:black">From: Bob Spidell via Healeys <<a href=3D"mailto:healeys@autox.t=
eam.net" target=3D"_blank">healeys@autox.team.net</a>> <u></u><u></u></s=
pan></p></div><div><p class=3D"MsoNormal"><span style=3D"color:black">Date:=
6/12/21 12:25 PM (GMT-06:00) <u></u><u></u></span></p></div><div><p class=
=3D"MsoNormal"><span style=3D"color:black">To: Bob Haskell <<a href=3D"m=
ailto:rchaskell@earthlink.net" target=3D"_blank">rchaskell@earthlink.net</a=
>>, <a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">healeys@=
autox.team.net</a> <u></u><u></u></span></p></div><div><p class=3D"MsoNorma=
l"><span style=3D"color:black">Subject: Re: [Healeys] Speed to RPM ratio? <=
u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"co=
lor:black"><u></u>=C2=A0<u></u></span></p></div><p class=3D"MsoNormal" styl=
e=3D"margin-bottom:12pt">That's it!<br><br>On 6/11/2021 4:31 PM, Bob Ha=
skell wrote:<br>> <a href=3D"http://longstonetyres.co.uk"; target=3D"_bla=
nk">http://longstonetyres.co.uk</a><br>><br>> Cheers,<br>><br>>=
Bob Haskell<br>> Austin Healey 3000 BN7/BT7 registrar<br>><br>> O=
n 6/11/21 7:01 PM, Bob Spidell wrote:<br>>> Note there is a not insig=
nificant difference in diameters of tires <br>>> with the same nomina=
l size (e.g. '165/80-15'). The English tire <br>>> site--can&=
#39;t think of the name offhand--has (had?) a table comparing <br>>> =
the diameters of different brands/models of the same size tires, and <br>&g=
t;> IIRC they could differ by as much as half an inch. I'd say to me=
asure <br>>> the actual diameter of your tires, but it's kinda ha=
rd when moving; <br>>> the 'flat spot' goes away--partially, =
at least--and the tires 'grow' <br>>> some from centrifugal f=
orce (anyone seen film of top fuel dragsters <br>>> launching; the re=
ar tires must expand a few inches or more?).<br>>><br>>><br>>=
;> On 6/11/2021 3:36 PM, John OBrien wrote:<br>>>> Thanks to al=
l who replied.=C2=A0 These will give me something to work with.<br>>>=
><br>>>> John<br>>>><br>>>> On 6/11/2021 4:26=
PM, John OBrien wrote:<br>>>>> Hi Guys and Gals<br>>>>=
;><br>>>>> I am trying to calibrate my tach.=C2=A0 I install=
ed a Spiyda RVI - RVC <br>>>>> conversion board, because my tac=
h was acting wierd. Anyway, I am <br>>>>> still trying to get t=
his setup to read correctly.=C2=A0 My question is, <br>>>>> on =
my BJ8 with standard 3.9:1 diff. what should my RPMs be in <br>>>>=
> fourth gear going 50 MPH , without overdrive engaged.=C2=A0 I'm ru=
nning <br>>>>> 165/80R15 tires. I'm just looking for a refe=
rence point to compare <br>>>>> what should be, and what I am r=
eading.<br>>>>><br>>>>> Any help is appreciated.<br=
>>>>><br>>>>> Thanks<br>>>>><br>>>=
;>> John<br>>>>><br>>><br><br>_____________________=
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