Did everybody forget that roadsters with SUs do NOT have real 'chokes'.
Pulling the choke handle only lowers the needle seat making a bigger opening
for fuel to the venturi, richening the mixture.
Paul
Ohio
----- Original Message -----
From: James Fogg <James@jdfogg.com>
To: <datsun-roadsters@autox.team.net>
Sent: Thursday, September 27, 2007 4:02 PM
Subject: Re: [Roadsters] How to warm up a Roadster?
> > -----Original Message-----
> > From: Mark Dent [mailto:mark@dealermats.com]
> > Sent: Thursday, September 27, 2007 3:20 PM
> > To: James Fogg; datsun-roadsters@autox.team.net
> > Subject: Re: [Roadsters] How to warm up a Roadster?
> >
> > Opening the choke does not lean out the mixture, it richens it.
>
>
> I'm not sure how you figure this. From the perspective of the butterfly
> valve, pulling on the choke handle closes the valve. Pushing the choke
> handle toward the dash opens the butterfly valve. When the valve is
> closed the fuel ratio is enriched because of greater vacuum in the
> venturi. Since air is easier to "pull" than fuel and the carburetor is
> set up for a certain balance of air/fuel, if you block the air entry
> (close the choke) you change the balance of fuel to air.
>
> Everything I've been taught says you enrich the air/fuel mixture to
> start a cold engine.
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