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The automatic choke has a bimetallic spring encased in the black round adjustable housing. Because it's bimetallic, it winds up when it's cold, and unwinds when it gets warm. this spring is connected to the same linkage that closes the choke plate and increases the idle speed. The spring can get heated by an electric wire (electric choke) or by a tube that connects to the exhaust manifold.
Anyone know the temp. range for when it is fully wound up and when it fully unwinds?
 

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I have no scientific answer, but I can at least make an educated guess. On the Edelbrocks, anyway, when the temps outside is over 95 degrees, the choke won't set, so it's somewhere around 95 for the fully heated (and expanded). It will set easily as long as the ambiant temps. are lower than 80 degrees, so fully cooled (and compressed) must be something in the 80-85 degree range.
 
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