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makarovboy -> Why would a drag strip require (9/25/2003 9:40:13 PM)
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It's to keep parts and oil off the track. The purge valve purges air (and residual nitrous) out of the system up to the nozzles. It maintains a full charge of nitrous in the lines at launch. If air is going in when you shoot, and nitrous comes on suddenly at an rpm not set for it, and maybe hits a few cylinders at a time....well, not pretty.
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