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Re: Zenith Carbs - Jetting

To: "Raser, Jason" <RaserJ@Pfizer.com>
Subject: Re: Zenith Carbs - Jetting
From: Ron Tebo <tebomr@cadvision.com>
Date: Wed, 03 Oct 2001 06:14:45 -0600
Jason:

Your compression readings are quite low. Are you sure that you took
these readings with the throttle and choke wide open?

Ron Tebo

"Raser, Jason" wrote:
> 
> You may recall I have a Series 2 that doesn't seem to run right.  I think
> I'm getting close to a solution.
> 
> I think I have eliminated all other possibile problems and everything points
> to my Zenith Carbs.  Scott was kind enough to send me the article "To carb
> and Alpine."
> 
> Before I go ahead and rejet these carbs (they are NOS, so I've done all I
> can to avoid opening them) I wonder if anyone has the experience I've had or
> if you could direct me to the most knowlegeable person about jets for an
> Alpine.
> 
> Turns out the carbs I have are:
> 
> C1688F
> 36WIP-2
> 1046674
> 
> and
> 
> C1688R
> 36WIP-2
> 1046874
> 
> The carbs I took off the car after I bought it were:
> 
> C3744F
> 36WIP-3
> 1800118
> 
> and
> 
> C1744R
> 36WIP-3
> 1800119
> 
> >From the article Scott sent me I see that the differences are:
> 
> Carb & Car              Pump discharge Nozzle   Idle Tube
> 36WIP-2 (S2)    50                              50
> 36WIP-3 (S2)    70                              45
> 
> New parts (or rebuilt):
> Carbs
> Generator
> Distributor (45D from Moss Motors)
> Mechanical fuel pump (from Sunbeam Specialties) (I've tried an electric pump
> too)
> New coil connected to a ballast resistor (a mechanic put this on)
> Clean fuel tank
> 
> Engine compression:
> 1       120 psi
> 2       121 psi
> 3       120 psi
> 4       125 psi
> 
> I put a fuel regulator after the fuel pump to ensure that I've got the right
> fuel pressure.  I adjusted the carbs to run a bit rich and I can drive the
> car.  Runs fine on the flat spots but struggles very hard up the hills.
> Have to keep it at 3,000-4,000 rpm.
> 
> I made sure my polarity on my coil is correct with the spark jumping from
> the plug toward the plug wire.  It jumps a good 1/4 inch or more.
> 
> I pulled the plugs and each of them are fine black powdery, naturally
> because it's running too rich.
> 
> If I simply change the pump discharge nozzle and idle tube, could this
> correct my problem by allowing me to run the carbs lean.
> 
> Any ideas would be appreciated.
> 
> Jason Raser

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