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Once the crankshaft is complete, they will either ammonia gas or ion treat it. Ion gas treatment will bring the metal's Rockwell (surface hardness) to approximately 55, while ammonia gas ranges from 42 to 44. With only a thirty-dollar difference in cost, it's more logical to choose the ion treatment as it's a cleaner process that promotes less warpage, depending on whether the metal has any stress in it. Additionally, ion gas treatment has less growth at a tenth of a millimeter or two, while ammonia gas treatment has two or three tenths. After it comes back from the treatment facility, Castillo pre-polishes the whole crank because of the chalky residue from the treatment forms. The unit is placed back onto the v-block for straightening; cleaned; rinsed off; and, after being coated in oil, is ready to be shipped off or picked up by the customer. View Related Article
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