The Northstar XV12 is the same length as GM's Vortec 8100 V8, and it has the approximate width and height as the Northstar 4.6-liter and Vortec 6000 V8s.
"The packaging was probably the biggest challenge we faced, because from the outset we wanted to fit the V12 inside the package of a V8," said Steve Kowalk, GM Powertrain project manager for the Northstar XV12. "We focused on keeping the size down to fit as many different types of vehicles as possible, while maximizing displacement, and then using Displacement on Demand to deliver the required power at all times. We also minimized cylinder bore wall thickness to 7 millimeters and used a rear cam drive to create a more compact package and enable a lower hoodline."
GM's Displacement on Demand enables the V12 engine to run seamlessly on six cylinders at times to maximize fuel savings, and is only one of several technological advancements showcased on the Northstar XV12. Some of the high-tech features included in Northstar XV12's capabilities:
DISPLACEMENT ON DEMAND
The cylinder shutdown is enabled through valve deactivation, which is performed by a compact switchable tappet. Cylinder de-activation occurs on the right-hand bank only, which allows the engine to run as a perfectly balanced inline 6-cylinder. The system deactivation and reactivation has a quick response time and the oil system and solenoid layout allows valve switching capability at up to 6000 rpm. In May 2001, GM announced that it will implement Displacement on Demand in its trucks and SUVs beginning in 2004.