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Re: Chronometric Question...

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Re: Chronometric Question...

Posted: Thu Sep 01, 2005 1:37 pm
by John Seim
The Chronometric operation is a clockwork comparator, comparing current
cable revolutions, with previous ones. Hence, the needle will never flow
smoothly, but will move as comparisons are made. It will be observed as
a erratic motion, but it is quite accurate. In the days before digital
electronics, many race cars were still fitted with chronometric
tachometers. These also had a second pointer needle, showing maximum rpm
achieved.
John Seim
Irvine, CA

elov_1947tc wrote:
>Greetings,
>
>I am in the process of putting the correct gauges in my 47 TC.
>Question about the Chronometric Tachometer.
>
>Should the needle be smooth while accelerating or is it normal for it
>to kinda jump/skip?
>
>This is kinda new for me so I just want to make sure that all is good.
>
>
>Thank you in advance,
>Elov
>
>
>

Re: Chronometric Question...

Posted: Thu Sep 01, 2005 1:58 pm
by Peter Roberts
Depends on the road surface, how many spokes are broke in the rear wheels,
whether the balance weights have flown off one or more wheels, how many flat
spots you put on the tires from panic stops when the idiot with disk brakes
ahead of you slammed on his brakes, and how many pubs you stopped at along
the way.

Factor all of this out and the tach should rise smoothly.

_Peter
----- Original Message -----
From: "elov_1947tc"
To:
Sent: Thursday, September 01, 2005 4:07 PM
Subject: [mg-tabc] Chronometric Question...


> Greetings,
>
> I am in the process of putting the correct gauges in my 47 TC.
> Question about the Chronometric Tachometer.
>
> Should the needle be smooth while accelerating or is it normal for it
> to kinda jump/skip?
>
> This is kinda new for me so I just want to make sure that all is good.
>
>
> Thank you in advance,
> Elov
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>

Re: Chronometric Question...

Posted: Thu Sep 01, 2005 2:54 pm
by Liz Harris
...Thanks John for the explanation...I`ve often wondered how they actually worked...but yes Elov, it is quite normal for the needle to move in `clicks`...or jump/skip. Mine on TC 2259 is a bit temperamental at the moment and makes the most awful noise at times...so much so that on a recent trip round the Emerald Isle I actually disconnected it...

Tweed
TC 2259 Cambridge UK.

John Seim wrote:
The Chronometric operation is a clockwork comparator, comparing current
cable revolutions, with previous ones. Hence, the needle will never flow
smoothly, but will move as comparisons are made. It will be observed as
a erratic motion, but it is quite accurate. In the days before digital
electronics, many race cars were still fitted with chronometric
tachometers. These also had a second pointer needle, showing maximum rpm
achieved.
John Seim
Irvine, CA

elov_1947tc wrote:
>Greetings,
>
>I am in the process of putting the correct gauges in my 47 TC.
>Question about the Chronometric Tachometer.
>
>Should the needle be smooth while accelerating or is it normal for it
>to kinda jump/skip?
>
>This is kinda new for me so I just want to make sure that all is good.
>
>
>Thank you in advance,
>Elov
>
>
>




Yahoo! Groups Links








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Re: Chronometric Question...

Posted: Thu Sep 01, 2005 4:52 pm
by SANDY SANDERS
BY JOVE I BELIEVE HE'S GOT IT
----- Original Message -----
From: Peter Roberts
To: mg-tabc@yahoogroups.com ; elov_1947tc
Sent: Thursday, September 01, 2005 4:41 PM
Subject: Re: [mg-tabc] Chronometric Question...


Depends on the road surface, how many spokes are broke in the rear wheels,
whether the balance weights have flown off one or more wheels, how many flat
spots you put on the tires from panic stops when the idiot with disk brakes
ahead of you slammed on his brakes, and how many pubs you stopped at along
the way.

Factor all of this out and the tach should rise smoothly.

_Peter

----- Original Message -----
From: "elov_1947tc"
To:
Sent: Thursday, September 01, 2005 4:07 PM
Subject: [mg-tabc] Chronometric Question...


> Greetings,
>
> I am in the process of putting the correct gauges in my 47 TC.
> Question about the Chronometric Tachometer.
>
> Should the needle be smooth while accelerating or is it normal for it
> to kinda jump/skip?
>
> This is kinda new for me so I just want to make sure that all is good.
>
>
> Thank you in advance,
> Elov
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>




Yahoo! Groups Links









[Non-text portions of this message have been removed]

Re: Chronometric Question...

Posted: Thu Sep 01, 2005 4:56 pm
by John Patterson
IT SKIPS AND JUMPS



-----Original Message-----
From: mg-tabc@yahoogroups.com [mailto:mg-tabc@yahoogroups.com]On Behalf
Of elov_1947tc
Sent: Thursday, September 01, 2005 4:07 PM
To: mg-tabc@yahoogroups.com
Subject: [mg-tabc] Chronometric Question...


Greetings,

I am in the process of putting the correct gauges in my 47 TC.
Question about the Chronometric Tachometer.

Should the needle be smooth while accelerating or is it normal for it
to kinda jump/skip?

This is kinda new for me so I just want to make sure that all is good.


Thank you in advance,
Elov






Yahoo! Groups Links

Re: Chronometric Question...

Posted: Thu Sep 01, 2005 7:16 pm
by DougPulver@aol.com
Mr. Kelsey says it "skips" and Mr. Grunau says it "bobs". Near as I can tell, both are correct although according to the Moss seat and interior people mine has temporarily "dyed".

(Sorry in advance - apparently too much time on my hands.)

Doug Pulver
TC 5850
San Diego, CA

-----Original Message-----
From: elov_1947tc
To: mg-tabc@yahoogroups.com
Sent: Thu, 01 Sep 2005 20:07:12 -0000
Subject: [mg-tabc] Chronometric Question...


Greetings,

I am in the process of putting the correct gauges in my 47 TC.
Question about the Chronometric Tachometer.

Should the needle be smooth while accelerating or is it normal for it
to kinda jump/skip?

This is kinda new for me so I just want to make sure that all is good.


Thank you in advance,
Elov






Yahoo! Groups Links






[Non-text portions of this message have been removed]
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