Niagara Gazette

Features

March 14, 2014

TOM'S CORNER: A cylinder deactivation technology update

(Continued)

Niagara Gazette — • Mercedes-Benz’s system is called Active Cylinder Control (ACC) and is offered on their V8 and V12 engines. These engines are pushrod engines, hence the system employs the use of split rocker arms linked by a pin, that when the cylinder is deactivated, is actuated via oil control by way of the Engine Control Module.

• Chrysler Group’s system is called Multiple Displacement System. Its offered on Chrysler’s 5.7-liter HEMI V8 engine. When in operation (speeds below 30MPH and engine RPM 3000 or less) the system bleeds off oil pressure in the hydraulic lifters allowing the valves to stay closed by virtue of valve spring tension. When the engine demand exceeds the specified operation environment, the system restores the cancelled cylinder operation.

• GM’s system is called either Displacement On Demand or Active Fuel Management. Offered on GM’s V6 & V8 engines, the system closes valves via hydraulic lifter oil control. Upon demand, the lifters are pumped up once again asserting valve control.

• Honda’s system is called Variable Cylinder management. The system is offered on only their J-Series overhead cam V6. When activated, the system deactivates an entire bank of cylinders reducing engine output to 3 cylinders. Upon the need, the cylinders are energized once again, restoring full V6 engine power.

• Volkswagen’s system is called Active Cylinder Technology. The system uses as its foundation, a 4-cylinder engine; this is a first. Previously cylinder deactivation was only reserved for use in 6, 8, & 12 cylinder engines. When in operation, it shuts down number 2 & 3 cylinders. The system operates at low speeds, when pulling power becomes necessary, the engine returns to 4 cylinder operation with one press of the gas pedal.

Well, there’s your cylinder deactivation system update!

‘Til next time ... Keep Rollin’

"America's Car Show" with Tom Torbjornsen airs 7:30 p.m. Wednesday, 9 a.m. Thursday and 11 a.m. Saturday on WBBZ-TV.

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