Definitely emissions. I believe this carb was also used with the dual
vacuum distributor. The idle adjustments are completely different. The
throttle is completely closed at idle, with an air adjustment setting
speed. The mixture screw has a much finer thread and setting precision.
I seem to remember two solenoids - one for the idle jet and one for the
idle air - if this is true, both need to be energized when running.
The 34 may have a bit larger venturi, since the number on Solex carbs
seems to track that dimension. The main jets are interchangeable with
the older carbs, far as I know, so it could be re-jetted for your motor.
I use a 31 PICT on the 1641 in my '67 Bug. I had to open the main jet a
tad, but it works fine.
Chuck Kuecker
No Quarter wrote:
I'm building a 1600SP engine for a friend of mine and somewhere along the line
we've misplaced the 31 PICT carburetor. Now I'm wondering the difference
between the 34 pict and 31 pict carburetors actually are? I know the flange is
smaller on a 31 pict but why were 2 different carburetors used? Was it an
emissions thing?
Also, if one uses a 31 PICT on a 1600SP, will the 31 PICT need to be rejetted
in order for it work properly? If so, where does one get jets? Can the main
jet be drilled out to make it work? If so, what size do you need to drill the
hole to?
I'm a bit confused as to what displacement the 31 pict was originally used on?
Thanks for the help.
Erin
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