<VV> 140 timing (with 280 isky cam) and 4 primary carb tuning advice wanted

[Mark Durham]

Ray, I believe that the carbs are set up so the secondaries come in at
around 25% of the primaries (built into the linkage). I read an article a
week or so ago that talked about people adding the second set of carbs to a
two carb engine from back in the 60's, and they used 4 primaries, but the
second set too was set to phase in at around 25 %, for driveability, it
says. Clarks has a kit to do just this,and their  material says the same
thing. I assume the original 140 setup is the same.
Mark Durham

On Wed, Nov 25, 2009 at 7:45 PM, Bryan Blackwell <bryan at skiblack.com> wrote:

> Consider that a stock primary has some airflow even fully closed if
> the throttle plate has the little half circle cutout.  I'd run the
> idle mixture screws out and see if that helps.  There's so little
> airflow needed the idle circuit could well make a difference.
>
> --Bryan
>
> On Nov 25, 2009, at 7:45 PM, Ray Rodriguez III wrote:
>
> >     For those still reading...  about my carbs....   I have 4
> > primaries... currently running them like stock secondaries.. idle
> > screws all the way in, and linkage set so they dont come in till
> > heavy throttle...   can anyone give me opinions backed up by logic/
> > facts on:
> >
> > A)  reasons I might want to use the secondary idle circuits...
> > opening the mixture screws and setting them up (balancing with the
> > vacuum guage I would assume?)  What affect this would have on
> > performance etc....   I have only a very vague understanding of
> > carbs.. I dont know why two extra idle circuits would improve
> > performance...  wouldnt it only affect the engine at idle anyway?
>
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