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Engine Theory: Cylinder Deactivation

August 29th, 2009
The idea behind cylinder deactivation theory on modern engines, sometimes referred to as multiple displacement, displacement on demand (DOD), or (VCM) variable cylinder management, is that certain cylinders deactivate during low power situations. Controlled by a primitive computer by today’s standards. The Cadillac L63 V-8-6-4 engines were the first to try that, if I remember [...]