Hi, I am changing over my 235 to a dual carb setup and had a question before I get into it. I am going to be running Fenton dual headers,with a Fenton intake with two Rochester BC Automatic carbs. My question is there a way to run one heating tube for both chokes, or can you run one tube from the headers to one choke, and the original tube to to the other choke and have them both work properly. Thanks for any info.
On my flathead, I added an electric choke (was originally heat tube type) to one of the carbs. One doesn't work as well as 2 would, but I had no room for a choke on the second carb. If you can convert to electric on both, you'd have a real winner. I know nothing about your carb types.
Do Fenton headers have heat tubes? You could drill 2 holes and run 2 tubes. I would drill the exhaust pipe just below the headers and make tubes out of steel fuel line or brake line covered with insulation.
I run 2 Rochester B on a 235 on an Offy intake. Manual choke on the rear. It opens the fast idle on both when I pull the choke. It runs great. Your idea with auto choke and on one carb will be fine.
http://www.fordification.com/forum/viewtopic.php?t=66144 Check this out, it's a great article, really detailed. The person demonstrates how they fabbed a new choke tube from readily available material. They describe exaclty how the system works. you could braze a Y joint and it would definately work, or hack a cheap dual carb solid fuel line. You just have to make sure both carbs are introducing vacuum to the choke housing. I have duals quads too, but I'm pretty lazy when it comes to details wrenching my own stuff so I just use electric chokes on both Rochesters. (I have to agonize over every little detail as I build stuff for wealthy people so I get no joy from doing that on my own time.)
Another option for heat to the choke: http://www.thecarburetorshop.com/Heatstovefabrication.htm Depending on where you live, and when you drive; a choke on one MAY work, but a choke on both WILL work better. The choke ****erfly acts as a straightening vane to reduce eddy currents in the incoming air, especially at lower RPM's. Running a choke on one only will cause each carburetor to flow differently. And here is another link that may (or may not) prove useful: http://www.thecarburetorshop.com/Dual1barrelcarbs.htm Jon.
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