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jim5618
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-- 01-18-2011 @ 9:10 AM
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What is the typical cost to beadblast items? I am in the Maryland suburbs of DC if that matters. I have a couple of Zenith Carbs I want to rebuild. Anyone know a shop in Montgomery county that does it?
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supereal
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-- 01-18-2011 @ 9:16 AM
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At our shop, we usually bead blast small items without charge. With bigger ones, we do have a fee, as the replacement beads are getting very expensive. I'd be careful about bead blasting any carb parts, as even though glass beads are less abrasive than sand, they will erode soft metals such as those used for carbs, and can damage gasket surfaces. It is better to soak the carb parts in a solution. While a mild acid bath is best, most compounds designed to remove lime deposits will work if given time.
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jim5618
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-- 01-18-2011 @ 10:58 AM
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Keep in mind this is a 1932 cast iron carb. I read in a couple of places on these carbs to bead blast them? I would prefer to just soak them but want to make sure I do a good job on them.
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supereal
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-- 01-18-2011 @ 12:10 PM
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Even the mildest bead blasting produces erosion of surfaces of most metals. There is soda and nutsh*ll blasting that produces less surface damage. The problem arises because gasoline has a very low surface tension, and can escape easily if joined parts are not very smooth. In most cases, gaskets can't be sealed with any compound, as they tend to dissolve in gas. Particularly nasty is any silicone sealer, which will clog passages as it falls apart. We suggest that gasket surfaces of iron carbs be trued by placing a sheet of fine emery paper on a glass surface, then rubbing the carb back and forth until no voids appear. This also works for units made of a softer metal.
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