StaffAllpar HomeMore NewsCarsTrucksUpcomingRepairsTest drives

Patented: New Air Intake System

by Bill Cawthon on

The U.S. Patent & Trademark Office has issued U.S. Patent 9,038,591 for a new intake air control system that improves engine efficiency.

The system, created by Kenneth D. Dudek of FCA US (the former Chrysler), works to increase the velocity of the air-fuel mixture being delivered to the cylinders. This may not sound like much, but it makes a big difference when an engine is running at low speeds.


According to the filing, most conventional intake manifolds are  designed for top efficiency at high or high medium engine speeds (measured in revolutions per minute, or RPM). They can’t adjust the velocity of the air-fuel mixture, due to their fixed cross-section, so the velocity of the air-fuel mixture falls at low RPM.

Some manifolds address this by using a plate (or “Charge Motion Control Valve”) in the intake runner to reduce the cross-section, increasing velocity. However, the torque applied to the valve plate’s pivot lowers its service life, and the tip of the plate is not close enough to the combustion chamber for best results.

Mr. Dudek’s design uses an inner frame assembly that can be inserted into the lower manifold, with flapper valves actuated by a four-bar link setup which lets different compound motions be created for each engine, and puts the valve closer to the injectors. Each flapper valve is driven, through a link, by a hypoid gear set, which are in turn controlled by a computer-controlled electric motor for constant adjustments.

Bill Cawthon grew up in the auto industry in the 1950s. His Dad worked for Chrysler and Bill spent a number of Saturdays down on the plant floor at Dodge Main in Hamtramck. Bill is also the U.S. market correspondent for, a British auto industry publication, and a member of the Texas Auto Writers Association, which has named the Jeep Grand Cherokee the “SUV of Texas” several times and named the Ram 1500 as the “Truck of Texas” two years running.

Bill has owned five Plymouths (including the only 1962 “Texan”), one Dodge and one Chrysler and is still trying to figure out how to justify a Wrangler. He also has owned at least one of every 1:87 scale model of a Chrysler product. You can reach him directly at (206) 888-7324 or by using the form.

Know & Go screens
Employees created new FCA US app—first available to Ram TRX

Newest Ram Built to Serve models honor the U.S. Air Force

Former Ram chief engineer Michael J. Cairns

More Mopar Car
and Truck News

Some popular Allpar pages

Dodge Demon

2018 Wrangler JL

Staff details/contactsTerms of ServiceInformation is presented to the best of our knowledge. Plans change and sometimes mistakes are made. Decisions or purchases made based on this site's verbiage or images are done at the reader's own risk. Also see the Allpar News archives, 1997-2008 • Copyright © VerticalScope Inc. All rights reserved. • Mopar, Dodge, Jeep, Chrysler, HEMI, and certain other names are trademarks of Fiat Chrysler Automobiles.