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Heat Stove Fabrication (using an original hot air choke carb on an aftermarket intake)


To utilize an original hot air type automatic choke on an engine with no hot air provisions, it is first necessary to understand how and why the choke is designed to function. This LINK will help.


One must fabricate a “heat stove” to provide heat to the automatic choke. This may be done as follows:


(1)   Take the carburetor to your local auto parts store. Have the clerk determine the thread size of the male threaded extension on the choke housing (assuming your automatic choke has the connection on the housing, and not in the center of the choke). Once this determination is make, you need a piece of tubing the appropriate size of sufficient length to reach from the choke housing to the exhaust manifold/header with a couple of extra loops, 2 female fittings, 2 ferrules, and one male fitting. You will also need a piece of sheet metal 6 inches by 3 inches by approximately 1/16th inch.

(2)   Take the piece of sheet metal and cut a ˝ inch square from each of the 4 corners.

(3)   Bend the four sides of the sheet metal to form a rectangular cup 5 inches by 2 inches by ˝ inch deep.

(4)   Drill a hole in the center of the cup and affix the male brass fitting with the connection on the side opposite the cup.

(5)   Affix the cup on a rounded surface of the exhaust manifold or header with the cup toward the manifold/header. This may be done with a pair of muffler clamps, or if you wish something that looks better, be creative. The object is to allow air to enter the cup from around the sides, be heated by the manifold/header, and then be available to the choke.

(6)   Attach the tubing and ferrules to the male fitting on both the heat stove and the choke housing with the female fittings. Put a couple of vibration loops in the tubing.

(7)    You are finished, time to play