Cat Twenty Intake / Exhaust Available??

Try Rosewood machine in the acmoc mag. he makes tens and fifteens dont know about twentys Jason

Used might be available from Jim Zimmerman, telephone (641) 982-4207 (voice); FAX 641-982-4297

PN is 1A-4936. I checked online and the only reference I found was another poor guy looking for one for a #10 Auto Patrol.

I took everything apart last night. The design is incredibly complex. The exhaust heat is apparently used to heat the tube coming from the updraft carburator. The fuel / air mixture has an approximately 1 foot climb, and then is routed to one of the 4 cylinders. I also learned that the little petcocks on each side are used as primers. Makes sense, I doubt you could really get the thing to start on the first pull with the convulated path the fuel / air has to take. I imagine the primers were used to get it going / build enough heat in the intake / exhaust crossover, and then the carb became effective.

My manifold is in far better shape than the guy who was looking for the #10 manifold (his was in pieces, literally). Mine was rebuild at some time, the crossover / chamber is "custom" as well as the carb flange, and the exhaust tubing is "custom" (water pipe) as well. The manifold does have cracking to the center box and a hole in the back which would allow exhaust to escape.

If I can't find a new / used manifold I will either have to rebuild this one, or build a whole new setup using steel stock. It will look nice but not be cast iron like this one. I would like to change the setup to a standard sidedraft carb and vertical exhaust (original, I believe, was down to the axle and out) but that throws originality out of the window.

Brian

Hi. You have parts of a manifold off of a late Twenty Five or a Twenty Eight. George Logue at Logue Industries, (570) 368-2639 or www.logueind.com has made new Twenty Eight manifolds before, If he has any in stock at this time I do not know. Jim Zimmerman has made new drop tubes for the Twenty style of manifold, he is also listing in the May/June ACMOC magazine that he has a L709 exaust manifold for sale. The L709 is also a Twenty style manifold. Jims number is (641) 982-4207
Thanks
Ken