[time-nuts] Anybody plotted the ADEV of a V8 idle speed?

[Tom Holmes]

Idle speed is simply controlled to an rpm value,
which thus makes it tied, loosely, to the CPU
clock. The phase noise is quite awful, by anyone's
standards, mainly because the parameters measured
to control fuel and spark timing, are noisy.

Tom Holmes, N8ZM

-----Original Message-----
From: time-nuts <time-nuts-bounces at lists.febo.com>
On Behalf Of Hal Murray
Sent: Saturday, February 06, 2021 9:48 PM
To: Discussion of precise time and frequency
measurement <time-nuts at lists.febo.com>
Cc: hmurray at megapathdsl.net
Subject: [time-nuts] Anybody plotted the ADEV of a
V8 idle speed?


wes at triconet.org said:
> Although Mr. Wineland's IQ must be at least 50
points higher than mine, we do
>  have something in common. I too owned a '36
Ford in my youth, about the same
>  time as he did, although mine was a Cabriolet
not a coupe, and I fitted it
> with  an OHV Studebaker V8, a smaller
displacement clone of a Cadillac V8. 

Speaking of V8s...

Just a simple graph of idle speed vs time for the
first few minutes after a 
cold start might be a fun high school science
project.

Is the idle speed of a modern warm engine locked
to the CPU's crystal or is 
there a feedback loop setting some pollution or
mileage parameter?

In the old days (pre computer), there was some
thermal input to the idle 
speed.  I assume it was a bimetalic element.

-- 
These are my opinions.  I hate spam.




_______________________________________________
time-nuts mailing list -- time-nuts at lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_l
ists.febo.com
and follow the instructions there.