Model A mystery carb...

[Special Coupe Frank]

Carb off the "new" '29 engine... sadly, the throttle-body lost an ear in the same accident that claimed the intake...

I am assuming this is a Tillotson, but the images on Google show die-cast upper body, this one is cast-iron...

Plus the idle mixture screw on Tillys seems to point sideways, parallel to the throttle shaft; this one points forward and up at an angle, like a Zenith...



More info: went back to garage for another look: round tag on bowl cover reads: 2405N, in an arch. Bowl has "Made in USA" cast into it on engine side, just below parting line. No other indentifying marks.

Opened it up, and found something very intriguing: in photo 2, there is a rounded verticl profile on both the carb bowl and the cover; inside is a well with a jet in the bottom and a spring-loaded metering rod(?) & piston in the bowl cover, with a vacuum port in the throttle body, above the butterfly.

Choke and throttle butterfly plates are steel, in brass shafts.

The throttle butterfly does have some part numbers stamped, and a symbol that is basically the letter " -Z-" inside a split circle...

Air horn has an inside diameter of 1-7/8" and an outside diameter of 2-1/16".

[jkeesey]

Looks kinda like a Tilly but then it doesn't. It seems to be missing the Tillotson markings. Ive got some Tilly's and Zenith's at the shop that need rebuilt if you need one.

[Special Coupe Frank]

The silvery disc rivetted to the top of the cast-iron float-bowl cover has some numbers stamped into it, but I haven't found a name anywhere on the unit....

I have the broken-off piece of the throttle-body; if this carb turns-out to be something decent, I may have a go at brazing the TB back together...

[jkeesey]

Hey its worth a shot, it looks so familiar but I just cant place it.

[jkeesey]

It could be a tractor from that era. I tried a search of popular cars of that era and didn't match one.

[Special Coupe Frank]

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Whatever it is, I'm thinking it was intended for the Model A / Model B Ford, as it has the combo choke/GAV, and the ball-fitting on the throttle lever...

I haven't found a match yet... searched on Tillotson, Marvel, Schebler, Holley...

[Benson]

Zenith tractor carbs use the brass tags ... try google with Zenith a space then the number all enclosed in quotes.

[jkeesey]

Could just be a period correct J.C.Whitney kind of carb. I'm kinda hoping someone else chimes in with an actual answer rather than our speculation.

[jkeesey]

I think I found it!
http://www.ebay.com/itm/Model-B-Ford...-/230686433325

[Special Coupe Frank]

Originally Posted by jkeesey

I think I found it!
http://www.ebay.com/itm/Model-B-Ford...-/230686433325

By George, you have got it !

I wonder if the performance is any better than with a stock Zenith ?

Damn shame about the mounting flange being broken....

SC Frank

[jkeesey]

yeah, you can try to repair it though and its apparently only worth $50 needing rebuilt. who knows on the performance factor its really hard to beat the old Zenith.

[BILL WILLIAMSON]

Whatever carb you use, performance is limited by the small bore in the manifold just above the carb. Chief described that small bore as "HENRY'S GOVERNOR! "B" manifolds are larger & "A" manifolds can be bored out to use the larger bore "B" carb. But, how fast do we really need to go? Bill W.

[Special Coupe Frank]

Good point, Bill...

Not necessarily looking for more speed out of my Flivver; just kind of curious about whether or not the vacuum operated power-valve improves performance / pulling under load....

Would like to know whether this carb is worth trying to revive...

Thanks,

SC Frank