<VV> Single Carburetor-reply

[corvairduval at cox.net]

Wait, Stop!

Not to rain on your parade, but what were you thinking that adding an
aftermarket anything to an engine you can't get running right in the first
place will fix anything?

Rochester HVs really are simple little carburetors. The engine should be
made to run on these to the best of its ability. Then, and only then,
should high performance options be considered. 

What problem did the rebuilt carburetors not fix? This needs to be attended
to first before introducing more problems.

Have you consulted fellow club members with your problem? I know Tom lives
up there near Baltimore. Must be more Group Corvair people in the area.

Now you have a carb rated for 119 more cubic inches than you have to feed.
Some thing will not be right unless rejetted and fiddled with. Sure it CAN
be made to run, but not with engine problems, and not better in all
situations than the stock setup. First is usually the choke problem with
any center mount carb.

I dare say there are fewer than 100 two barrel carb center mounts in use.
But, what do I know? I've think I've seen one in use in 30 years. I have
seen many of the manifolds for sale. Four barrels, yes, I have seen many of
those running. And they have their own problems of trying to get good
overall performance. I.e. fuel milage vs idle vs choke vs high speed all
wrapped up neatly like the stock setup.

Come on down to the Virginia Vair Fair (May 3-5) and talk with some folks
who have more experience with high performance mods.

www.vairfair.com

Frank DuVal

Original Message:
-----------------
From: John Ingram johnvi at cloud9.net
Date: Mon, 22 Apr 2013 15:42:27 -0400
To: virtualvairs at corvair.org
Subject: <VV> Single Carburetor-reply


Lon, Frank, Jim, and Joel,
Thank you all for your quick response!  If these setups are known to  
be weak in low end torque then that is the way it will be.  However,  
I've heard of adjustable vacuum canisters etc.  A little more  
explanation:  I've tried to get this worn and not too healthy engine  
to run on its 2 carburetors with some success and finally gave up  
after getting rebuilds that didn't solve the problem.  I don't blame  
the carburetors, the engine may have a crack or some other vacuum  
leak that I can't find it.  I live inside the Baltimore beltway so I  
normally drive from stoplight to stoplight.  No matter how much  
horsepower you have or want, the most important thing, in my opinion,  
is having a good idle.  Stalling out at stoplights is not good in a  
rat race.  The single carb does give a good idle.  The Rochester 2  
barrel came off a 67 Chevy 283 and I rebuilt it.
The problem is when I watch the vacuum advance when I blip the engine  
from idle it dips before it goes up, after that the advance is  
normal.  I have set the timing by making sure it does not go above 32  
degrees BTDC at high rpm.  I need to get rid of the "dip".  The  
engine sometimes stumbles when it dips and may even pop back through  
the carburetor. The vacuum is connected to the vacuum tube already on  
the carb, not from the manifold.  Would manifold vacuum work better?
JI

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