<VV> 4-carb question

[corvairduval at cox.net]

If you never put your foot in it, the gas in the secondaries can gum up,
cause the needle to stick, and if it sticks open, will drip gas, causing
poor fuel milage. The 140 secondary carbs I just took off had not run in a
long time, but they leaked new stale gas into the heads while moving the
car to its new home. The needles were stuck not quite closed upon opening
them.

Yes, Bob's Rochester carb book.

20 in stop and go traffic is great. 20 on the highway, not so much. ggg

The gumming of secondary carbs was one reason given for so many tri-power
Olds in 1957 being converted to a single quadrajet. Of course that
"square"jet had two float bowls also...

Frank DuVal

Original Message:
-----------------
From: Chris & Bill Strickland lechevrier at earthlink.net
Date: Thu, 07 Jul 2011 14:23:06 -0700
To: virtualvairs at corvair.org
Subject: Re: <VV> 4-carb question



>Frank quoted "somewhat from Bob Helt's book" ...
>  
>

Which one of his books, thecarb one?

>The secondary (H) carb's throttle plates are held closed by the accelerator
>pump return springs. These are somewhat shorter and stiffer than the
>regular accelerator pump return springs.
>

Maybe I'm in line to learn something here, or relearn something I'd 
forgotten?

Mostly, I've been keeping my foot out of the secondaries on this ride, 
and the primaries should be giving me better fuel mileage than the 20 
that I'm getting, imo.  There are other factors involved, of course, but 
at the moment I'm looking at this aspect of it.

Thanks for the tip Frank, as I often tend to use primary carbs in the 
secondary position.

Bill Strickland
 

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