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Looking for Marvel Schebler chart identifying carbs by size

flyguy5219

Registered
Last Subscription Date
12/25/2013
I use the medium? cast iron body size M-S carbs in place of the rarer originals on my tractors. They seem to work fine and getting a tractor with no orig carb on it to start has been easy for me.
I know of the small body models that fit the Ford 8N and other small 4cyl, the medium size that fit the later 172 CI size 801,901, 4000 Ford engines and am curious if there is a LARGE body for bigger 4/6 cyl motors around 350-400 CI size?
Any ideas guys?
 

mmcdonald

Sponsor
Last Subscription Date
04/13/2017
There were three body sizes of TSX series carbs(which is the type you're referring to per the applications). The small ones are either 1-1/16 or 1-1/8 throttle bore, the medium ones are either 1-3/16 or 1-5/16 throttle bore and the large ones are 1-7/16. There were multiple venturi sizes for each body size. The 1 7/16 would run a 350-400 engine sufficiently as long as it was not high rpm say 1800 maximum or so. Put simply a carburetor body and venturi size is proportional to the amount of air that needs to flow through it. If you got much over 400 cu in it would probably be time to step up a size. This roughly depends on number of cylinders, cu in, and rated rpms. You have to take several factors in mind about the "right" carb size. For instance there is a little overlap in venturi ID's. You could get the same ID venturi on the small and the medium or you could get the same ID on a medium and a large but the amount of air that the carb flows is different because the carburetor body is different. It could be as much as 30 cfm or more difference with the same ID venturi. The most common carbs larger than the 1-7/16 TSX you're going to be able to find are going to be Zeniths but they are getting hard to get your hands on. Hope this helps
 

flyguy5219

Registered
Last Subscription Date
12/25/2013
Thanks so much for that info and thanks too for the great customer service when I called you folks.
 
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