“You’re going to see significant gains down low and then you’re going to see significant losses up high in terms of temperature, but the displacement of the engine has a big impact on it, and also the fuel being burned, the type of induction, whether it’s forced induction or naturally aspirated.” “There’s not one standard scale that we use that will show that if you have a decrease in temperature by X amount, you’ll gain Y amount in horsepower,” said Jonathan Fiello, vice president of product development and engineering for K&N Engineering in Riverside, Calif. But there is no formula or rule of thumb that will tell us how much of a power increase to expect with a given decrease in temperature. The whole point of a cold air intake is to get colder air, which is denser, and holds more oxygen for a given volume. A lot has changed since then, specifically emissions regulations and more precise fuel-delivery systems, but the best intake systems are based on the same principles, and the math and science behind them is as fascinating as it is instructional. Read on and you will, too.Ĭold air intakes have been around a long time. We spoke with engineers from K&N and Corsa Performance, two industry leaders in the air intake business, and we learned a lot. We wanted to know more, so we asked a lot of how and why questions, and what we learned was eye-opening. They have become so ubiquitous because they work well enough that we don’t even ask why or how. Whether we’re talking about a street car, a racecar or even a tow vehicle, one of the easiest-to-install and most cost-effective performance parts we can add to it is a cold-air intake.
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