<VV> 140 Engine studders when secondary carbs begin to kick in?

[Padgett]

>When I punch it, it feels like there is a minor boost then
>the secondary more powerful boost.
>
>How do I get it so they kick in immediately without any hesitation?

Is a characteristic of carburated engines and why you have accelerator 
pumps. First thing I would do is to check for a shot in all four carbs when 
cranked open.

Second thing if your only interest is in performance is to go to 52 jets 
all the way around. Am sure there is a more scientific answer but since you 
are asking...

Rationale is that the sag or soft spot when you crank the throttle open is 
because the mixture is going lean instantaneously since there is a lag 
between the sudden air flow increase and the venturi signal creating a 
similar increase in fuel flow. By jetting rich to begin with, it doesn't 
get as lean as with a properly lean cruise mixture.

The final thing to do if you really do not care about MPG is to remove the 
vacuum advance line and hope that the extra rich mixture (above) will keep 
the engine cool. This will eliminate the slight delay as the vacuum signal 
goes from lean cruise advance (lots) to the pure mechanical (less) wanted 
for pure power. Has to do with the difference in flame front propagation rate.

And if you really do not care about MPG or money, then the real answer is a 
direct port (six injectors) digital fuel injection but then a Corv8 might 
be cheaper.

Padgett

ps for the RTFM crowd, may I suggest starting with Sir Harry Ricardo's "The 
High Speed Internal Combustion Engine"