At 12:35 PM 10/21/98 -800, Neil McAllister wrote:
>I've obtained a manual choke/starting unit from an earlier carb. I've also
>obtained a new cable and clip. Any and all advice from others who have gone
>down this road would be gratefully appreciated.
>
>Also, anyone who could explain the method in which these units function would
>be helpful; I understand they aren't a conventional choke.
Neil,
My '79 with its ZS carb (you DO have the Zenith Stromberg, right?) has a
manual choke conversion instead of the water-actuated choke.
Basically the manual choke cable pulls open the water-choke's enrichment
plate, instead of the water-heated clock-spring type mechanism.
The enrichment plate, when "choked", allows more gas to enter the carb just
in back of the piston bridge. There is a little hole back there which you
can see if you look carefully.
A choke on a "normal" carb uses a butterfly to restrict the air rather than
increase the gas. The end result is the same, more gas to the same mount
of air.
There is a good explanation (with pictures!) of the water choke in the
Bentley manual.
>
>
Atwell Haines
'79 Spitfire FM96062 UO
Succasunna, NJ USA
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