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Rpm

Test the exhaust emissions

The vehicle may also be connected to an exhaust-gas-analyzer by inserting a probe into the tailpipe. With the car running in Neutral, the mechanic can check the amount of carbon monoxide (CO) and hydrocarbons (HC) in the exhaust (other emissions can be tested with more sophisticated analyzers, but these two reveal a great deal). He [...]

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More Clout for Calibra

Sleek, attractive, and well finished, the Opel Calibra coupe came out of the box a pretty strong offering for the GM Europe team. Its 150-horsepower 2-liter 16-valve twin-cam four gave the top-line model an 8.2-second 0-60-mph capability and a top end of 138 mph. But the playing field changes quickly in the sport coupe game, [...]

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Where Does All the Horsepower Go?

When a car manufacturer  advertises that a V-8 engine delivers 250 horsepower, what does this mean? Technically, the term horsepower means the capability for doing so much work in so much time. One horsepower is defined as 33,000 foot-pounds of work per minute. So, the power necessary to lift 33,000 pounds one foot in one [...]

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