Ferrari Mailing List: Winding Road

(continued)

The latest issue of this free E Magazine has been released.   Current issue 
has a excellent article comparing a F430 and 911 on the Mille Miglia 
circuit -
The website www.windingroad.com has the current issue with links to back 
issues.  All the back issues are not available in a one shot download - but 
individual articles are there.  I have all 16 issues if anyone needs one.
You can sign up for free email alerts as well as automatic downloads of 
current issues if desired.   An excellent resource - and it;s free.  Another 
neat feature is a Favorite Winding Road submitted by readers around the 
country.
Neat stuff -
Larry T (67 MGB, 74 911, 78 240D, 91 300D)

www.youroil.net for Oil Analysis and Weber Parts

Test Results http://members.rennlist.com/oil

PORSCHE POSTERS!  youroil.net

Weber Carb Info http://members.rennlist.com/webercarbs

Porsche Road Test http://members.rennlist.com/roadtest/

.

----- Original Message ----- 
From: <f2kracer [at] aol.com>

To: "Larry Turner" <l02turner [at] comcast.net>

Cc: <Staxwax [at] aol.com>; <len_ashburn [at] hotmail.com>; <MaxEd49 [at] aol.com>; 
<ferrari [at] ferrarilist.com>; <alexzanardifan [at] hotmail.com>

Sent: Friday, January 05, 2007 8:11 AM

Subject: Re: [Ferrari] Vintage LM Race vintage tachymeters
The point of the chrono tach, I think, was so it could be read at a glance 
without having to focus on a still moving needle. The other trick (which 
we still use today with analog gauges) is to rotate the gauge in it's 
mounting in the dash so that the normal readings (or red-line in the case 
of the tach) will have the needle at 12 o'clock, allowing a positional 
check of the gauges with a quick glance rather than having to pause, 
focus, and interpret.
Tom Pattison
f2kracer [at] aol.com
f2kracer [at] hotmail.com

-----Original Message-----

From: red5hilser [at] aol.com

To: f2kracer [at] aol.com; lashdeep [at] yahoo.com

Cc: ferrari [at] ferrarilist.com; Staxwax [at] aol.com; len_ashburn [at] hotmail.com; 
alexzanardifan [at] hotmail.com; MaxEd49 [at] aol.com

Sent: Thu, 4 Jan 2007 5:41 PM

Subject: Re: [Ferrari] Vintage LM Race vintage tachymeters

Thanks, my friend. It appears that you have solved our 'burning question.'
Yer pal, Ferrari Bubba

-----Original Message-----
Subject: Re: [Ferrari] Vintage LM Race vintage tachymeters

I believe what you're referring to were known as chronometric tachs, and 
that intermittent action was done to make them more readable at speed 
(while racing)
Tom Pattison
f2kracer [at] aol.com
f2kracer [at] hotmail.com

-----Original Message-----
Sent: Thu, 4 Jan 2007 4:04 PM
Subject: Re: [Ferrari] Vintage LM Race vintage tachymeters

Beats me. Back in the 1950's/60's, when I used to haunt the pits at such 
places as Riverside, Pomona, Paramount Ranch, and Laguna Seca, it was 
common in pure race cars to see the tachs move in increments of a few 
hundred revs. It was so common that I think it was SOP. Both Smiths in the 
British cars and Jaeger in the Italian Ferrari's Maserati's, and OSCA's 
were the same. My Jaguar XK120 and Austin-Healey 100 had mechanical Smiths 
which were smooth, but they were road machines. I remember watching 
Carroll Shelby warm up John Edgar's 4.5 Maserati in the pits at Pomona, 
and the tach jumped back and forth a few hundred revs at a time as he 
'bliped' the throttle. Had I known this would come up 50 years later on 
the List ... I would have asked 'Ol Shel' or John, who always sat in a 
director's chair on top of his 18 wheel hauler to watch the races. In 
those days the vast majority of cars were towed to the races using either 
a pick-up or panel truck. Needless to say, I was impressed

!
Yer pal, Ferrari Bubba

-----Original Message-----
From: lashdeep [at] yahoo.com
To: red5hilser [at] aol.com
Cc: ferrari [at] ferrarilist.com
Sent: Thu, 4 Jan 2007 12:03 PM
Subject: Re: [Ferrari] Vintage LM Race vintage tachymeters

On older cars, I've only seen tachs that read a signal off of a 
rotating/timed

engine component. Typically, this would be a distributor or a camshaft. If 
the

tach jumps, it would have to mean a voltage problem with either the 
"generator"

on the engine or in the actual gauge itself.
I did ask a friend who restores old Jags to add thoughts. Apparently, the 
old

XK140s used a cable that ran off of the camshaft. This cable led to the 
gauge

which contained a plastic hub that positioned the needle. He's seen these 
cables

get contaminated with oil leaking from the cam seal. This oil creates a 
problem

in the hub mechanism at the gauge and can cause those erratic tach 
movements.
So, in short...who knows!?!
It would have to depend on the car and what type of tach it uses...
What car were we talking about here?
LS
----- Original Message ----
From: Doug and Terri Anderson <dnt [at] dock.net>
To: LS <lashdeep [at] yahoo.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Sent: Thursday, January 4, 2007 9:10:39 AM
Subject: Re: [Ferrari] Vintage LM Race vintage tachymeters

Done on purpose and hard to duplicate by instrument restorers.  Perhaps 
the

old smooth tachs had a tendency to fly way past the actual rpm and those

that stuttered were closer to actual engine rpm.  Just a guess.  Built in

damper.

DOUG
----- Original Message ----- 
From: "Paul Bennett" <pbennett [at] macnet.com>

To: "DOUG" <dnt [at] dock.net>

Cc: "The FerrariList" <ferrari [at] ferrarilist.com>

Sent: Wednesday, January 03, 2007 10:03 PM

Subject: [Ferrari] Vintage LM Race vintage tachymeters
I noticed in many cockpit shots of the older cars, the tachymeters
didn't increase smoothly as now, but stepped up and down in
large rpm increments.  Like perhaps 3.0k > 3.5k > 4.0k >4.5k
Any idea of why the jerkiness?

Great show...18 different race start/finish and view of the
'control room' which I'd not seen or heard of before.

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Winding Road	<– Date –> <– Thread –>
From: LarryT (l02turnercomcast.net)
Date: Fri, 5 Jan 2007 10:14:55 -0800 (PST)