Southern California Racer Fills Rainy Day with Air Filter Tests

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Rain days in Southern California can be brutal, and if you like to go outside to race, the downpours can make you stir crazy. A group of guys were tinkering in a Romoland garage during one of those rainy weeks, and the talk of the afternoon became a debate over which air filter works best.

Jim Patelli, 68, started racing in 1957 and builds motors for his own cars. He said he was tired of talking about which filter works best and decided to do something about it.

“I had four filters, a K&N and three others that I purchased at a PRI convention in Indianapolis,” said Jim. “I made a dust sprayer using regular bread flour and positioned it in front of the motor on my motor stand.”

Jim told K&N Engineering the flour he used was about the same consistency as the silt that plagues his engines. In Romoland, the wind can also be a problem. It picks up tiny grains of clay and silt that swirl around the air in the form of dust clouds. The flour mixture creates the same result as the silt, said Jim. “Both completely block air passage.”

During Jim’s engine test the dust sprayer was placed low in his engine test stand. He said the motor ran at a steady 3000 RPM for four minutes per filter. “I turned the fan on full blast,” said Jim. “The K&N filter blocked all the flour from the engine.”

“We judged the results by looking at how much white powder was coated on the carburetor throats,” said Jim. “The K&N filter did its job.”

Jim said he took many precautions to make sure there was a good seal. “In my opinion the K&N filter was by far the best, remember this test was for me,” he said. “There is nothing phony about it.”

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K&N Engineering, Inc. of Riverside, California, is the inventor and leading innovator of High Flow Technology and Lifetime air filters for automotive applications. K&N has been manufacturing our exclusive line of Lifetime air filters in Riverside California for more than 35 years. We continue to lead the way in pioneering new and innovative technologies designed to allow your car, truck, boat, or motorcycle to get all the air it needs to perform its very best. K&N Engineering, now a truly global company with offices in the U.K. and the Netherlands, continues to exist as a family owned business with an enthusiast mindset and a direct connection with motor sports that carries over throughout all levels of management and manufacturing. Today, K&N exists as both the sales and brand leader for performance filters, and maintains a stocking catalogue of over 3,500 part numbers, including an extensive line of factory replacement drop-in filters, performance air intake systems, and High-Flow oil filters. For more information about K&N Filters, please contact K&N Engineering, Inc., P.O. Box 1329, Riverside, CA 92502-1329, (800) 213-4182 for a dealer near you, (800) 858-3333 for technical service/questions, (951) 826-4001 Fax, e-mail, or visit