Because the needle works by the increasing force generated by the increase in
magnet rotation speed driven by engine gear drive, typically from the camshaft,
against a very light spring that weakens with age, while the magnets are
permanent earth magnets which do not.
-----Original Message-----
From: R. Ashford Little II [mailto:ralittle2@mindspring.com]
Sent: Friday, June 27, 2003 2:12 PM
To: 'Randall Young'; triumphs@autox.team.net
Subject: RE: Ign advance and cam phasing for TR4
Randall wrote:
(it's never been calibrated and
they do go up as they age),
Why is that Randall? Just curious.
R. Ashford Little II
www.geocities.com/ralittle2
-----Original Message-----
From: owner-triumphs@autox.team.net
[mailto:owner-triumphs@autox.team.net] On Behalf Of Randall Young
Sent: Friday, June 27, 2003 1:02 PM
To: triumphs@autox.team.net
Subject: RE: Ign advance and cam phasing for TR4
> How many of us are honest enough to admit that they use the
distributor to
> help adjust the idle speed when all else fails?
Not a question of honesty ... I just don't consider idle rpm all that
important. What earthly difference does it make if it idles at 1500
rpm, as
long as it keeps running ? I don't plan to spend that much time idling
anyway ...
My TR3A tach is probably wildly inaccurate (it's never been calibrated
and
they do go up as they age), and it reads anywhere from 800 rpm to 1500
rpm
at idle, depending on how hot the weather is (and how hot the radiator
is).
Strictly NBD, IMO.
I think we've all been spoiled by modern cars, with fuel injection and
active idle rpm compensators. The old SUs just never did hold idle rpm
spot
on.
Randall
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