FW: <VV> Judson Supercharger Install Complete!!!

[Eric S. Eberhard]

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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