<VV> Judson Carb
chuck
chsadek@adelphia.net
Thu, 4 Mar 2004 18:06:11 -0500
Eric,
If you haven't taken the carb apart, cleaned and adjusted it,
then you need to do that. You can use a carb cleaner dip or try and
clean passages with Brakeclean. With the red plastic/nylon tube on the
can, you can generally flush the passages. Air helps, but don't apply
air thru the passages to a closed carb, because you could damage the
float. You do need to clean out the passages. Check for bad gaskets
which might cause an air leak, affecting the carb operation-messes up
the reference air pressure for the "signals", or allows the desired air
flow to bleed off, again resulting in incorrect "signal".
Chuck S
-----Original Message-----
From: virtualvairs-admin@corvair.org
[mailto:virtualvairs-admin@corvair.org] On Behalf Of Eric S. Eberhard
Sent: Thursday, March 04, 2004 1:44 PM
To: Sadek Charles H DLVA
Cc: virtualvairs@corvair.org
Subject: Re: FW: <VV> Judson Supercharger Install Complete!!!
Hmmmm. Thanks. I had observed that making the idle circuit as rich as
possible helps ... I was thinking that perhaps the idle jets are too
lean
(my mains are variable and I think about right at this point). If it
was
getting a bit more fuel at idle then perhaps it would be better?
The carb is the correct carb for the application so it is a problem
specific to my carb, not to improper application.
To fix these passages could it be as simple as cleaning the carb (e.g.
take
apart and dip in cleaner and/or spray some air through passages?). Or
is
it harder than that? One Idea I had was to just send the stinking carb
to
Wolf Enterprises and get a quality rebuild ...
Thanks so much for your help!
At 11:05 AM 3/4/04, you wrote:
>-----Original Message-----
>From: Sadek Charles H DLVA [mailto:SadekCH@nswc.navy.mil]
>Sent: Thursday, March 04, 2004 10:08 AM
>To: virtualvairs@corvair.org
>Subject: RE: <VV> Judson Supercharger Install Complete!!!
>
>Eric,
> Re your transitions....
>
>This sounds like massive transition/progression circuit failure. On a
>normally aspirated carb application, you are aware there is an idle jet
and
>"circuit"-the passages that mix air and fuel. Likewise there is a main
jet
>and main circuit which does the same thing; mix air and fuel. These
two
>circuits are applied where the vacuum/pressure "signal" is the
strongest or
>optimum for the individual circuit.
>
> The carb must move from using the idle circuit to the main
circuit
>and there are a series of passages that allow for fuel and air to pass
into
>the carb bore as the idle signal falls off and the main jet signal
increases
>and takes over.
>
>This transition is critical; much more so than most folks realize.
>
>When you floor it, you are opening the throttle plate, momentarily have
>massive air flow with little fuel, then before dumping accel pump fuel,
you
>have air-choked the engine. At a lesser throttle, without sufficient
>"transition" mixture to carry it into higher rpm and air flow
operation, the
>engine stumbles and picks up.
>
>You may have a too big carb. You may have jets that are not right for
the
>supercharged application. You may have no transition circuit
operation.
>
>Chuck S
>YS73
>
>-----Original Message-----
>From: Eric S. Eberhard [mailto:flash@vicspdi.com]
> Subject: <VV> Judson Supercharger Install Complete!!!
>
>The vice: the transition, up or down, from idle to throttle is
"abrupt" to
>say the least. From a stop if I completely floor the car it dies.
Less
>throttle and it stumbles a second and then goes. I also feel this when
>coasting to a stop ... it just abruptly transitions to idle (it does
not
>die you just feel it). When trundling along at 35 or so on a flat road
it
>will transition down then with a tiny touch of the pedal transition
back
>up. I am pretty sure this is when the mains kick in or out versus the
>idle. ..... Any opinions or advice?
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Eric S. Eberhard
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