<VV> Intermittent vacuum leak?

[Roger Gault]

Mel,
Can't be a vacuum leak.  When you open the throttle, that "leak" will
overpower any other ones, so they don't effect acceleration.  Vacuum leaks
will make it idle crummy, but aren't a problem during accel.

Sounds more like a fuel problem to me.  Is the fuel pump healthy?
Disconnect the passenger side carbs and see if it acts like it does when
it's being bad.  That'll tell you if you have something on one side.
Be sure your secondary linkage is working correctly - or disconnect it.
Maybe one of the secondaries is opening with the primaries?  Too much carb
for low RPM.

Roger

----- Original Message ----- 
From: "Mel Smith" <my65vair at hotmail.com>
To: <virtualvairs at corvair.org>
Sent: Saturday, March 25, 2006 4:21 PM
Subject: <VV> Intermittent vacuum leak?


> My '65 140 with two carbs has been acting oddly lately. I drive it around
> and at some stop lights the engine will bog down and not accelerate, while
> at other stoplights it seems perfectly healthy. It seems like at random
> intervals the engine will refuse to rev up and will kind of kick back when
> you open the throttle. I have already rebuilt the carbs and have since
> cleaned them out thouroughly. The theory presented to me has been that
there
> is a vacuum leak causing the hesitation, which would explain it since it
> sometimes idles poorly, but how could the leak only randomly affect the
> engine at odd times? It doesn't seem to be related to the temperature of
the
> engine. What are some sources that can act like this and what are other
> problems could it be? I'm running plates to cover the secondary carb
mounts
> and there are seals on the throttle shafts.
>
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