steve s
Well-known member
I recently obtained a pdf of the description and service information for this carb, which I'll attempt to attach. The file pertains to the basic unit that Zenith refers to as the Model 68. The throttle and choke linkage are modified specifically for the Model A in the Zenith Model 13922.
The pdf shows the interesting double-float and the semicircular float bowl that they claim permits it to operate on steep inclines. Perhaps this also helps it resist stalling on hard stops (?). I have no idea why it is so much more resistant to vapor lock issues than any other carb I've used.
I had previously posted pdf's for the similar Models 67 and 267. I'm in the process of trying to modify the linkage on a 267 (aka 14991) to try on my Ford. The specs on the 68 say it's intended for use on motors up to 170 cubic inch, whereas the 267 goes up to 250 ci. Don't know why they chose to set up the 68 rather than the 267 for Model A use in the first place. The 68 (aka 13922) seems to go down the road as well as any original Zeniths or Tillotsons I've used, but you know how some people are always greedy for more.
By the way, Zenith Fuel Systems is alive and well in Bristol, VA and last year celebrated 100 years of making carbs and more recently fuel injection systems in the USA, mainly for industrial and farming applications but also for street rods and motorcycles. They apparently also sell some parts for the Marvel Schebler carbs, which were used on some tractors.
http://www.zenithfuelsystems.com/
Steve
The pdf shows the interesting double-float and the semicircular float bowl that they claim permits it to operate on steep inclines. Perhaps this also helps it resist stalling on hard stops (?). I have no idea why it is so much more resistant to vapor lock issues than any other carb I've used.
I had previously posted pdf's for the similar Models 67 and 267. I'm in the process of trying to modify the linkage on a 267 (aka 14991) to try on my Ford. The specs on the 68 say it's intended for use on motors up to 170 cubic inch, whereas the 267 goes up to 250 ci. Don't know why they chose to set up the 68 rather than the 267 for Model A use in the first place. The 68 (aka 13922) seems to go down the road as well as any original Zeniths or Tillotsons I've used, but you know how some people are always greedy for more.
By the way, Zenith Fuel Systems is alive and well in Bristol, VA and last year celebrated 100 years of making carbs and more recently fuel injection systems in the USA, mainly for industrial and farming applications but also for street rods and motorcycles. They apparently also sell some parts for the Marvel Schebler carbs, which were used on some tractors.
http://www.zenithfuelsystems.com/
Steve
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