TodaySeptember 21, 2021

Chevy Silverado’s passive flapper valves and more

Jeff Luke, Executive Chief Engineer for the Chevy Silverado talked to www.drivingthenation.com about passive flapper valves. Chevy uses Active Fuel Management to shut off cylinders in their V-6 and V-8 engines. To reduce the noise that would occur during that transition they included a passive flapper valve that is used for exhaust tuning. When the engine is making the transition there is no indication that the engine is going in V-4 or V-6 from a V-8 mode.

The only way one knows the valves are shutting off is through an indicator light on the screen. Luke takes us through some of the hidden upgrades for the 2013 Chevy Silverado including hill ascent/descent control and hydraulic body mounts.

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Lou Ann Hammond

Lou Ann Hammond is the CEO of Carlist and Driving the Nation. She is the co-host of Real Wheels Washington Post carchat every Friday morning and is the Automotive, energy correspondent for The John Batchelor Show and a Contributor to Automotive Electronics magazine headquartered in Korea. Hammond is a founding member of the Women's World Car of the Year #WWCOTY, and board member of the Women in Automotive.