<VV> Turn Cut-Out?

[larry@forman.net]

Hi Joe,
While I am not an expert on this, let me give you my thoughts:
1. I believe the turn cutout fix in Bob's book should solve this issue.  As I understand the problem, the gas sloshes up and covers BOTH
vents and does not allow venting.  This then causes the cut out.  The solution is to install the vents as in Bob's book and you really DO
need to extent the vents well below the place where they enter the carb interior.
2. I have David's ball and socket inlet valves and use these for all my carbs and carb rebuilds.  David and I had this discussion about
"solving" the turn cutout problem.  While I sincerely doubt it, I DO believe these ball and socket inlet valves are superior to the stock
inlets.  Given that they flow more they might help the recovery or keep the float levels more consistent and at the proper level.  I would
also recommend drilling out the inlet passage behind the inlet filter stones to help with the flow issue.  Note that Grant Young has larger
diameter inlet valves both in the stock "rubber" tipped variety as well as the ball and socket style and I think they are quite reasonably
priced compared to some other Corvair sources.  Unrelated to the turn-cutout issue, Grant also has stainless steel mesh inlet filters that
have lower inlet loss and might also help with this problem.
3. So I would recommend adding the turn-cutout tubes, since they are really simple and cheap to install and perform the modifications and
parts replacement in #2 above and then see if it solves your issue.
4. Beyond that, you might try some other ideas like relocating the jets as described in the Corsa Tech Guide.  I believe that Seth and
others can perform this modification.

HTH.

Larry



On Thu, 1 Apr 2004 21:41:45 -0500, "N. Joseph Potts" wrote:
>      When I make this u-turn and then floor it, the engine acts as though
> throttled, and accelerates (this is in first gear) only VERY slowly, not
> recovering until I take my foot off the accelerator, such as to shift to
> second, which I don't get to for quite a while in the circumstances.
>      In a normal straight-line start, I don't experience anything like
> this - I get what I believe is normal performance for a 140.
>      Is this turn cutout (I have stock carburetors, with stock float levels
> (parallel to cover-gasket plane))? Would I benefit from installing the
> cut-out fix described (among other places) in Bob Helt's Classic Corvair?
>      I have ball-and-cage float valves (the ONLY modification to my carbs),
> and I seem to recall The Source advertising that if you have these, you
> don't need carb vents. Is this so? If so, would I benefit from plugging my
> carb vents?
>      Thanks for all input, and I hope you'll POST your replies, although if
> you don't, it won't actually make any difference to me.
> 
> Joe Potts
> Miami, Florida USA
> 1966 Corsa coupe 140hp 4-speed with A/C
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Larry Forman