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cnavarro cnavarro is offline
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Join Date: Oct 2001
Location: Momence, IL 60954
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Like you thought, boring out the stock 3.2 cylinders is a bad idea. At 100mm, that leaves you with a case spigot of 103mm which means the skirt is roughly ~102.9mm. The actual aluminum thickness on average would be deducting for plating thickness would be 102.9-100.2, or 2.7mm, or 1.35mm per side. Just to give you a point of comparison, i've made custom Nickies before with just over 1mm per side, but you have to consider cast vs. extruded material properties, strength, and fatigue life, etc. The case register of a standard 3.5 conversion cylinder is upped 2mm, to give you added skirt thickess, so that they don't break off in the case like thin cast vw cylinders do on a regular basis. Those cylinders ended up in a hot rodded vw about 4 years ago and are still running strong. So I guess it would be similarly possible to make a slip in Nickies 100mm that wouldn't need the case machined, but no one ever wants to be a paying guinea pig :-)
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Charles Navarro, LN Engineering
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Old 08-05-2005, 09:15 AM
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