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Drag Tech: How Does Nitrous Oxide Work?: Nitrous oxide is made up of 2 parts nitrogen and 1 part oxygen (36% oxygen by weight). During the combustion process, at around 572 degrees F, nitrous breaks down and releases oxygen. This additional oxygen creates more power by allowing more fuel to be burned. Nitrogen acts as a buffer, thus dampening the increased cylinder pressures, therefore helping control the combustion process. Nitrous also has a tremendous "intercooling" effect by reducing the intake charge temperatures about 60 to 75 degrees F.
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Drag History: The National Hot Rod Association Pro Stock class emerged from the production-based Super Stock class in 1970 with a more liberal set of rules and an absence of handicaps. Rules initially favored big-block V8s but by 1972 had changed to favor small-blocks to reflect contemporary trends in the American auto industry. However, by the early 1980s the big-blocks returned due to the popularity of faster “outlaw” Pro Stocks who continued to use that engine combination throughout the 1970s.
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