<VV> 140 hesitation on transition to secondaries

[J. R. Read]

A couple of things (at least) come to mind.
 
You should be able to modify the unisyn with some sort of thick gasket - tall enough to have it clear the vent tubes.

Check the accelerator pump cups in the primaries (and the secondaries if you've added them there as well) for hardness.  If they are not soft, change them out.

Did this engine start out life as a 110?  You might need to recurve the distributor advance (by changing springs and/or weights (under the plate)), or you might just have a worn out plate.  Or, be sure that you have a 140 distributor in the first place.

Have you checked the throttle cross shaft to see that the right side is not lagging behind the left side as you open the throttle?  The carb linkage can be adjusted to syncronize that.

All vacuum hoses are in place and not hard or leaking and are connected to correct ports?  I'm assuming no vacuum leaks on the carb throttle shafts since you say they are new.

There is probably other stuff to check that I did not think of and the order above is not really in sequence with where to look first or last.  Just in the order that these items came to mind.

Later, JR


________________________________
From: Ramon Rodriguez III <corvairgrymm at gmail.com>
To: virtualvairs at corvair.org 
Sent: Monday, August 12, 2013 10:45 PM
Subject: <VV> 140 hesitation on transition to secondaries


Hi guys.  I've finally got caught up on things enough to get back to
work on the Vairs, so today I finally got my red 66 140 Corsa coupe
back on the road with the new race carbs and headers.

I've got a few little issues with the car to solve yet, one of which
is a hesitation when slowly pushing the pedal down far enough to get
into the secondaries.  This problem had become somewhat present on the
old carbs but more noticeable now.  I haven't done a good balancing
job yet (unisyn won't work with the vent tubes so I need to improvise
a little) so I'm thinking that is quite likely the cause.  Just to be
safe I thought I'd ask before I beat my brains out trying to perfectly
sync the secondaries.

The other problem I'm having could be related but is not obviously
related on the surface.  Last year the car developed an intermittent
miss at part throttle, then got to where it was not pulling well at
full throttle.  The carbs have been replaced with brand new race
prepped carbs since then and the problem still remains so I figure it
has to be the ignition system.  I'm looking at ignition system options
now (gonna ask on fastvair).

Thanks,

Ray Rodriguez III
Certifiable Vair Nut