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John: On a previous long Healey trip with my son, I commented on the =
fact that my odo was not in agreement with the GPS. I was confident =
that my odo was correct having compared it to official highway mile =
markers. His brilliant solution (he is brilliant of course because he =
is my son ) came up with the following: the automobile is travelling up =
and down various hills and mountains whereas the GPS is calculating the =
distance on a level altitude. The difference is the added distance =
created by going up and down the fluctuating altitude of the highway. =
This may or may not be the solution but it sounds logical to me.
(The Other) Len
Fairfield, CA, USA
1967 AH 3000 MkIII, HBJ8L39031
----- Original Message -----=20
From: banjojohn=20
To: Jim Ryan ; i erbs=20
Cc: Ahealey help=20
Sent: Sunday, June 13, 2021 3:50 PM
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 =
linked, from the tranny, to the engine, and my tach gets its signal from =
the coil, which also is directly linked to engine speed through the =
distributor. =20
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>=20
Date: 6/13/21 4:17 PM (GMT-06:00)=20
To: i erbs <eyera3000@gmail.com>=20
Cc: banjojohn <banjojohn@cox.net>, Ahealey help =
<healeys@autox.team.net>=20
Subject: Re: [Healeys] Speed to RPM ratio?=20
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.=20
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>=20
Date: 6/12/21 12:25 PM (GMT-06:00)=20
To: Bob Haskell <rchaskell@earthlink.net>, healeys@autox.team.net=20
Subject: Re: [Healeys] Speed to RPM ratio?=20
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=20
>> 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=20
>> the diameters of different brands/models of the same size =
tires, and=20
>> IIRC they could differ by as much as half an inch. I'd say to =
measure=20
>> the actual diameter of your tires, but it's kinda hard when =
moving;=20
>> the 'flat spot' goes away--partially, at least--and the tires =
'grow'=20
>> some from centrifugal force (anyone seen film of top fuel =
dragsters=20
>> 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=20
>>>> conversion board, because my tach was acting wierd. Anyway, I =
am=20
>>>> still trying to get this setup to read correctly. My =
question is,=20
>>>> 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=20
>>>> 165/80R15 tires. I'm just looking for a reference point to =
compare=20
>>>> what should be, and what I am reading.
>>>>
>>>> Any help is appreciated.
>>>>
>>>> Thanks
>>>>
>>>> John
>>>>
>>
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<META content=3D"text/html; charset=3DUTF-8" http-equiv=3DContent-Type>
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<DIV> </DIV>
<DIV>John: On a previous long Healey trip with my son, I commented =
on the=20
fact that my odo was not in agreement with the GPS. I was =
confident that=20
my odo was correct having compared it to official highway mile =
markers. =20
His brilliant solution (he is brilliant of course because he is my son=20
) came up with the following: the automobile is travelling up =
and=20
down various hills and mountains whereas the GPS is =
calculating the=20
distance on a level altitude. The difference is the added distance =
created=20
by going up and down the fluctuating altitude of the =
highway. =20
This may or may not be the solution but it sounds logical to me.</DIV>
<DIV> </DIV>
<DIV>(The Other) Len<BR>Fairfield, CA, USA<BR>1967 AH 3000 MkIII,=20
HBJ8L39031</DIV>
<DIV> </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Dbanjojohn@cox.net =
href=3D"mailto:banjojohn@cox.net";>banjojohn</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Dryan@jimryan.com =
href=3D"mailto:ryan@jimryan.com";>Jim Ryan</A> ; <A =
title=3Deyera3000@gmail.com=20
href=3D"mailto:eyera3000@gmail.com";>i erbs</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A =
title=3Dhealeys@autox.team.net=20
href=3D"mailto:healeys@autox.team.net";>Ahealey help</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, June 13, 2021 =
3:50 PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [Healeys] Speed to =
RPM=20
ratio?</DIV>
<DIV><BR></DIV>
<DIV>Jim, you are right. I have used GPS and my speedo is not =
accurate,=20
but close enough for me. My point was that the speedo is =
mechanically=20
linked, from the tranny, to the engine, and my tach gets its signal =
from the=20
coil, which also is directly linked to engine speed through the=20
distributor. </DIV>
<DIV>Regardless of my actual speed, my speedo and tach should maintain =
a=20
direct relationship in any given gear.</DIV>
<DIV>Thanks again for all the opinions and various charts and facts =
provided=20
by the list members.</DIV>
<DIV><BR></DIV>
<DIV>John</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV id=3Dcomposer_signature>
<DIV style=3D"COLOR: #575757; FONT-SIZE: 85%">Sent from my T-Mobile 4G =
LTE=20
Device</DIV></DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV style=3D"COLOR: #000000; FONT-SIZE: 100%" align=3Dleft>
<DIV>-------- Original message --------</DIV>
<DIV>From: Jim Ryan <ryan@jimryan.com> </DIV>
<DIV>Date: 6/13/21 4:17 PM (GMT-06:00) </DIV>
<DIV>To: i erbs <eyera3000@gmail.com> </DIV>
<DIV>Cc: banjojohn <banjojohn@cox.net>, Ahealey help=20
<healeys@autox.team.net> </DIV>
<DIV>Subject: Re: [Healeys] Speed to RPM ratio? </DIV>
<DIV><BR></DIV></DIV>
<DIV>Am I missing something? I just check accuracy with the GPS =
on my=20
phone.</DIV><BR>
<DIV class=3Dgmail_quote>
<DIV dir=3Dltr class=3Dgmail_attr>On Sun, Jun 13, 2021, 3:25 PM i erbs =
via Healeys=20
<<A =
href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</A>>=20
wrote:<BR></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; =
PADDING-LEFT: 1ex"=20
class=3Dgmail_quote>
<DIV>My tach is driven by my distributor gear
<DIV>Speedo comes off my transmission. Not sure about the =
relationship=20
to accuracy. <BR><BR>
<DIV data-smartmail=3D"gmail_signature">Ira Erbs<BR>1959 AH =
100-6<BR>1967=20
MGB<BR>Milwaukie, OR</DIV></DIV></DIV><BR>
<DIV class=3Dgmail_quote>
<DIV dir=3Dltr class=3Dgmail_attr>On Sun, Jun 13, 2021, 11:50 AM =
banjojohn=20
<<A href=3D"mailto:banjojohn@cox.net"=20
rel=3Dnoreferrer>banjojohn@cox.net</A>> wrote:<BR></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; =
PADDING-LEFT: 1ex"=20
class=3Dgmail_quote>
<DIV>
<DIV>Thanks.</DIV>
<DIV>I am actually just comparing the tach with the speedometer =
indicated=20
speed, which, I believe reads a little high due to tire =
size. But=20
the relationship between the indicated speed and the tach should =
be=20
consistant since they are both driven by actual engine or output =
shaft=20
speed.</DIV>
<DIV><BR></DIV>
<DIV>John</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV =
id=3Dm_-8612040742838000386m_-7997059852725315655composer_signature>
<DIV style=3D"COLOR: #575757; FONT-SIZE: 85%">Sent from my =
T-Mobile 4G LTE=20
Device</DIV></DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV style=3D"COLOR: #000000; FONT-SIZE: 100%" align=3Dleft>
<DIV>-------- Original message --------</DIV>
<DIV>From: Bob Spidell via Healeys <<A=20
href=3D"mailto:healeys@autox.team.net"=20
rel=3D"noreferrer noreferrer">healeys@autox.team.net</A>> =
</DIV>
<DIV>Date: 6/12/21 12:25 PM (GMT-06:00) </DIV>
<DIV>To: Bob Haskell <<A =
href=3D"mailto:rchaskell@earthlink.net"=20
rel=3D"noreferrer noreferrer">rchaskell@earthlink.net</A>>, <A=20
href=3D"mailto:healeys@autox.team.net"=20
rel=3D"noreferrer noreferrer">healeys@autox.team.net</A> </DIV>
<DIV>Subject: Re: [Healeys] Speed to RPM ratio? </DIV>
<DIV><BR></DIV></DIV>That's it!<BR><BR>On 6/11/2021 4:31 PM, Bob =
Haskell=20
wrote:<BR>> <A href=3D"http://longstonetyres.co.uk"=20
rel=3D"noreferrer =
noreferrer">http://longstonetyres.co.uk</A><BR>><BR>>=20
Cheers,<BR>><BR>> Bob Haskell<BR>> Austin Healey 3000 =
BN7/BT7=20
registrar<BR>><BR>> On 6/11/21 7:01 PM, Bob Spidell=20
wrote:<BR>>> Note there is a not insignificant difference in =
diameters of tires <BR>>> with the same nominal size (e.g.=20
'165/80-15'). The English tire <BR>>> site--can't think of =
the name=20
offhand--has (had?) a table comparing <BR>>> the diameters =
of=20
different brands/models of the same size tires, and <BR>>> =
IIRC they=20
could differ by as much as half an inch. I'd say to measure =
<BR>>>=20
the actual diameter of your tires, but it's kinda hard when =
moving;=20
<BR>>> the 'flat spot' goes away--partially, at least--and =
the tires=20
'grow' <BR>>> some from centrifugal force (anyone seen film =
of top=20
fuel dragsters <BR>>> launching; the rear tires must expand =
a few=20
inches or more?).<BR>>><BR>>><BR>>> On 6/11/2021 =
3:36=20
PM, John OBrien wrote:<BR>>>> Thanks to all who =
replied. =20
These will give me something to work =
with.<BR>>>><BR>>>>=20
John<BR>>>><BR>>>> On 6/11/2021 4:26 PM, John =
OBrien=20
wrote:<BR>>>>> Hi Guys and=20
Gals<BR>>>>><BR>>>>> I am trying to =
calibrate my=20
tach. I installed a Spiyda RVI - RVC <BR>>>>> =
conversion=20
board, because my tach was acting wierd. Anyway, I am =
<BR>>>>>=20
still trying to get this setup to read correctly. My =
question is,=20
<BR>>>>> on my BJ8 with standard 3.9:1 diff. what =
should my=20
RPMs be in <BR>>>>> fourth gear going 50 MPH , without =
overdrive engaged. I'm running <BR>>>>> =
165/80R15 tires.=20
I'm just looking for a reference point to compare =
<BR>>>>>=20
what should be, and what I am=20
reading.<BR>>>>><BR>>>>> Any help is=20
appreciated.<BR>>>>><BR>>>>>=20
Thanks<BR>>>>><BR>>>>>=20
=
John<BR>>>>><BR>>><BR><BR>_____________________________=
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