Kevin:
Here is a reply from Jarrid in a recent thread that answers your first
question, but a following thread on sources did not turn up US suppliers.
Ron Tebo
Kevin Meek wrote:
>
> Our S3 Alpine GT has always run very rich...now with the help of a
> borrowed Colortune and parts manual, I've discovered that I have
> a set of WIP downdraft Zenith carbs intended for a SI. The jets
> are numbered 130, and they work fine UNTIL I put the air cleaner
> on...then the fuel mixture becomes too rich (we have the GT style
> air cleaner with paper element). It looks like I might need smaller
> jets - does anyone know what size jets might be appropriate (105?)
> and where I might obtain them? Thanks in advance for your help!
>
> -Kevin
> Subject: RE: Zenith Carbs - Jetting
> Date: Tue, 2 Oct 2001 08:39:15 -0700
> From: Jarrid Gross <JGross@econolite.com>
> To: "Raser, Jason" <RaserJ@Pfizer.com>, alpines@autox.team.net
>
> Jason,
>
> You didnt mention what the main jets are/were.
> These, and the choke "venturi" side are the things
> that effect the running/power mixture not the pump
> discharge nozzle, and idle tube/ jet.
> The chokes are marked with a number, but could
> possibly be measured in the carb. The chokes run
> from 27mm to 30mm for the special tuning option
> offered by rootes.
>
> Also, some carbs are jeted for paper ellement filter,
> and some are jetted for bird catchers, running paper
> ellement filters with carbs setup for the bird cather
> will tend to run rather rich due to the restricivity
> of the filters.
>
> In the sunbeam alpine I-IV, there is a table in the zenith
> WIA/WIP section that describes the jets, air bleeds and
> chokes for all zenith applications.
>
> Hope this helps,
>
> Jarrid Gross
>
> -----Original Message-----
> From: owner-alpines@autox.team.net
> [mailto:owner-alpines@autox.team.net]On Behalf Of Raser, Jason
> Sent: Tuesday, October 02, 2001 6:32 AM
> To: alpines@autox.team.net
> Subject: Zenith Carbs - Jetting
>
> 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
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