IN CONTROL

摘要

When I first started in this business in the late 1970s, I worked with an older mechanicrnwho raced a 327 cid-equipped Camaro at the local drag strip. Serious racers of the era had a keen interest in track elevation, relative humidity and air temperature, all numbers they used to calculate relative air density. They kept a record of carburetor settings in a little notebook and would set up their initial tuning based on past per-rnformances under similar conditions. Next came a few wide open passes down the track, followed by a close examination of the spark plugs. A light brown center porcelain meant a slightly rich air/fuel ratio - a mixture where there was just a little more fuel than needed for a stoichiometric mix, and one that helped insure maximum horsepower.