<VV> ambient???????

[Lon Anderson]

Mark,
Your info is good except for the part about the choke pull offs... they are vacuum operated, and "pull the choke off" so more air can get into the combustion chamber. If you're puffing black smoke, you should adjust (bend) the rod that pulls the choke plate open on the choke pull off, thereby allowing more air.
The actual choke spring is what actuates the choke... via the little rod you screw up and down.
If you set the choke rods correctly they will in turn set the fast idle cam... set the choke pull offs so they allow the engine to run smoothly when started... once thats done, you don't have to fiddle with it at every temperature change...
It's like a Ronco product... you "set it, and forget it"...
Later,
Lonzo... daily driver '64 700... with temp swings from 0° to 105°
;-)






-----Original Message-----
From: Mark Durham <62vair at gmail.com>
To: J R Read <hmlinc at sbcglobal.net>
Cc: virtualvairs at corvair.org
Sent: Sun, Jan 16, 2011 12:27 pm
Subject: Re: <VV> ambient???????


A temp of 30 degrees F is a bone chilling day down next to the
eashore in high humidity, but may be a short sleeve shirt day where
he air is dry. So, those conditions are noticeable to us and to the
ngine, But the choke coil does not feel a difference. It only feels
0 degrees. So, ambient air temp is the temp where ever you are, or in
his case, the discussion is on carburation and choke adjustment, so
mbient is the air around the choke coil.
When the air is blown down through the cylinder and head fins, the
ngine will cool at different rates for humid air versus dry air,
ecause the moisture adds a cooling element all its own. Not sure we
ould notice the difference, however.
The choke pull-offs are a coil spring affair that get tighter when
old, and opens up as it  warms up. On a cold day, when you press the
as pedal the first time, the chokes close. For any particular
etting, they will close tighter (richer mixture) when cold, and less
ight when warmer.
You adjust the chokes so when you start the engine, it runs. If it
uffs black smoke for a few seconds, no big deal. But if it continues
o do so after thirty seconds or so, you need to adjust the choke rods
 bit shorter. If the engine stalls when started, then you need to
djust the choke rods a bit longer to increase spring tension and keep
he choke plates more closed with air flowing past them.
I used to reset choke adjustments two or three times a year when the
orvair was a daily driver. But, I have temp swings of +95F to -20F to
eal with each season. Hope this helps.
ark Durham

On Sat, Jan 15, 2011 at 10:54 PM, J R Read <hmlinc at sbcglobal.net> wrote:
 The air in your garage, carport, driveway - or wherever else it may be
 parked long enough to cool down to "ambient".  Once running, the ambient
 temp has little effect on the choke coils since they heat up right along
 with the engine.  When cold outside, the engine starts at that colder temp
 it takes a little longer for the engine to get warm enough for the chokes to
 open up.

 Later, JR

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