How to vent your Corvair Carburators

We will now concentrate on the outside ( top side ) of the carburetor top. Here you will notice that the new vent tube is exiting the carburetor at a parallel position to the throat of the carb. The height you may leave the tube depends on whether you are going to use the STOCK air horn setup or an individual aftermarket air cleaner. In either case, you MUST bend the tube slightly inward so as not to interfere with the sideways seating ability of the air horn or the individual air cleaner. You also must be aware of the limited vent tube height you have before you interfere with the inside TOP of the stock air horn. The vent tube height in the above picture is well within the limits and will be more than adequate to accomplish the improved venting that virtually eliminates carburetor flooding and the unwanted stumbling and hesitation of the engine during hard cornering. In the next picture you will notice I have used my faithful Ice Pick to bend the top of the vent tube for the needed clearances described above. Now you are ready to finish this one side. Duplicate all these steps on the opposite side of the carburetor and then mix your epoxy and carefully fill the areas around both tubes on the inside top of the carburetor. Use just enough epoxy to level the area around each tube. With this last step you have insured that no gas will leak around your new vent “stack” and that the tube will be secure and remain oriented in the proper alignment. Leave the top inverted and level until the epoxy is properly hardened and you have successfully vented your carburetor. I use another scrap carburetor top as a base to hold the vented top in a level inverted position. If you have a two-carburetor engine you are half way, if you have a 140 hp engine then get busy as you have only begun.

Chuck Armer 3-23-2006

How to vent your Corvair Carburators PhotoHow to vent your Corvair Carburators Photo