<VV> Choke Coil VS Pull Off - was ambient

[William Hubbell]

Absolutely correct, Frank.

Bill Hubbell

On Jan 16, 2011, at 6:32 PM, Frank DuVal <corvairduval at cox.net> wrote:

> Well, only if you start up and quickly go to full throttle. ggg
> 
> The choke pull off works all the time there is manifold vacuum, which 
> only goes away at full throttle.
> 
> To quote Bob Helt: "Anytime the engine is running, either at an idle or 
> at speed, there will be manifold vacuum at this port. Thus, the choke 
> will be prevented from fully closing anytime the engine is running."  
> Quoted from his carburetor book, pg 39.
> 
> The port where the choke pull off is connected is a rather large (by 
> carburetor standards) hole straight to the intake manifold ( i.e. below 
> the throttle plate).
> 
> I do agree in use that the choke pull off is no longer the primary choke 
> plate positioner once the engine has warmed up to where the choke coil 
> is holding the choke plate open.
> 
> Frank DuVal
> 
> On 1/16/2011 5:58 PM, Bill Hubbell wrote:
>> Don't have the whole thread on front of me, but the choke pull-offs only function when the throttle plate is nearly closed. As you open the throttle wider the vacuum feed to the choke pull-off falls and it ceases to function. It really only comes into play at start-up.
>> 
>> Bill Hubbell
>> 
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