One air filter under the hood of the aero trucks of today will not supply that amount of air. Many of you now have 750 horses under your right foot, and that will require a whopping 1,987 CFM. A 600-hp 14, 15 or 16-liter diesel engine requires 1,600 CFM. The 15-inch diameter Vortox filters provide 1,700 CFM each, giving the engine 3,400 CFM of air. We all know the dual Vortox polished stainless-steel air filters on the newer Kenworths, Peterbilts, Western Stars and Freightliner Classics are beautiful, but they also perform a necessary function – increased air flow for today’s bigger engines. The older J Series Cummins, 237 Mack, and the 671/8V71 Detroits all required less than 800 CFM. The Small Cam Cummins engines that were 335-hp and lower only required about 850 CFM. The older and smaller cubic inch engines did not require a lot of fresh air to run properly, which is measured in CFM (cubic feet of air per minute). This article will be about a commonly overlooked problem, among other things, when installing a newer diesel engine into an older truck – air flow. There’s something special about rebuilt old iron – especially a Class 8 truck from the mid 1970’s and older. Many of us who have been in the trucking industry all our lives, and even some younger people, have a fascination for older “classic” trucks.
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