Hey guys, trying to find Cat Twenty intake / exhaust / carb / air cleaner setups. Are any of these pieces available new?? If not, used??

I believe that much of this will work on my #9.

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

Our club has a PL20 that I have been working on. Louge did have parts, but was down to his last items a couple of years ago. A list member here found us half the mainfold, It had a couple of cracks so it was brazed, but recracked. We then had it powder welded. This worked good, but at that point we had about as much in it as we could have bought a reproduction one for. The heat raiser does not work on ours. The manifold is teh week spot on these twentys.