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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 consistant
> 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 with.
> >>>
> >>> 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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Content-Transfer-Encoding: quoted-printable
<div dir=3D"auto">My tach is driven by my distributor gear<div dir=3D"auto"=
>Speedo comes off my transmission.=C2=A0 Not sure about the relationship to=
accuracy.=C2=A0<br><br><div data-smartmail=3D"gmail_signature" dir=3D"auto=
">Ira Erbs<br>1959 AH 100-6<br>1967 MGB<br>Milwaukie, OR</div></div></div><=
br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun,=
Jun 13, 2021, 11:50 AM banjojohn <<a href=3D"mailto:banjojohn@cox.net";>=
banjojohn@cox.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote"=
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><d=
iv dir=3D"auto"><div dir=3D"auto">Thanks.</div><div dir=3D"auto">I am actua=
lly just comparing the tach with the speedometer indicated speed, which, I =
believe reads a little high due to tire size.=C2=A0 But the relationship be=
tween the indicated speed and the tach should be consistant since they are =
both driven by actual engine or output shaft speed.</div><div dir=3D"auto">=
<br></div><div dir=3D"auto">John</div><div dir=3D"auto"><br></div><div dir=
=3D"auto"><br></div><div id=3D"m_-7997059852725315655composer_signature" di=
r=3D"auto"><div style=3D"font-size:85%;color:#575757" dir=3D"auto">Sent fro=
m my T-Mobile 4G LTE Device</div></div><div dir=3D"auto"><br></div><div><br=
></div><div align=3D"left" dir=3D"auto" style=3D"font-size:100%;color:#0000=
00"><div>-------- Original message --------</div><div>From: Bob Spidell via=
Healeys <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" re=
l=3D"noreferrer">healeys@autox.team.net</a>> </div><div>Date: 6/12/21 1=
2:25 PM (GMT-06:00) </div><div>To: Bob Haskell <<a href=3D"mailto:rchas=
kell@earthlink.net" target=3D"_blank" rel=3D"noreferrer">rchaskell@earthlin=
k.net</a>>, <a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" =
rel=3D"noreferrer">healeys@autox.team.net</a> </div><div>Subject: Re: [Heal=
eys] Speed to RPM ratio? </div><div><br></div></div>That's it!<br><br>O=
n 6/11/2021 4:31 PM, Bob Haskell wrote:<br>> <a href=3D"http://longstone=
tyres.co.uk" target=3D"_blank" rel=3D"noreferrer">http://longstonetyres.co.=
uk</a><br>><br>> Cheers,<br>><br>> Bob Haskell<br>> Austin H=
ealey 3000 BN7/BT7 registrar<br>><br>> On 6/11/21 7:01 PM, Bob Spidel=
l wrote:<br>>> Note there is a not insignificant difference in diamet=
ers of tires <br>>> with the same nominal size (e.g. '165/80-15&#=
39;). The English tire <br>>> site--can't think of the name offha=
nd--has (had?) a table comparing <br>>> the diameters of different br=
ands/models of the same size tires, and <br>>> IIRC they could differ=
by as much as half an inch. I'd say to measure <br>>> the actual=
diameter of your tires, but it's kinda hard when moving; <br>>> =
the 'flat spot' goes away--partially, at least--and the tires '=
grow' <br>>> some from centrifugal force (anyone seen film of top=
fuel dragsters <br>>> launching; the rear tires must expand a few in=
ches or more?).<br>>><br>>><br>>> On 6/11/2021 3:36 PM, J=
ohn OBrien wrote:<br>>>> Thanks to all who replied.=C2=A0 These wi=
ll give me something to work with.<br>>>><br>>>> John<br>=
>>><br>>>> On 6/11/2021 4:26 PM, John OBrien wrote:<br>&g=
t;>>> Hi Guys and Gals<br>>>>><br>>>>> I a=
m trying to calibrate my tach.=C2=A0 I installed a Spiyda RVI - RVC <br>>=
;>>> conversion board, because my tach was acting wierd. Anyway, I=
am <br>>>>> still trying to get this setup to read correctly.=
=C2=A0 My question is, <br>>>>> on my BJ8 with standard 3.9:1 d=
iff. what should my RPMs be in <br>>>>> fourth gear going 50 MP=
H , without overdrive engaged.=C2=A0 I'm running <br>>>>> 1=
65/80R15 tires. I'm just looking for a reference point to compare <br>&=
gt;>>> what should be, and what I am reading.<br>>>>><=
br>>>>> Any help is appreciated.<br>>>>><br>>>=
;>> Thanks<br>>>>><br>>>>> John<br>>>&g=
t;><br>>><br><br>_______________________________________________<b=
r>Support Team.Net <a href=3D"http://www.team.net/donate.html"; target=3D"_b=
lank" rel=3D"noreferrer">http://www.team.net/donate.html</a><br>Suggested a=
nnual donation=C2=A0 $12.75<br><br>Archive: <a href=3D"http://www.team.net/=
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</blockquote></div>
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