No DOD

[Tru_Ice]

Looks like no DOD after all. What a relief! This is an article I found in gminsidenews talking about the DOD system.

"PONTIAC, Mich. – Compact, powerful and packed with innovative technology – it’s an accurate description of the modern GM small-block V-8. Those words also were used to describe the original small-block when it debuted in 1955.

GM will introduce the Gen IV small-block V-8 50 years after the first small-block. It will be available in V-8-equipped models of the 2005 Chevrolet TrailBlazer EXT, GMC Envoy XL and Envoy XUV, offering fuel-saving Displacement on Demand (DOD) technology.

“The new Gen IV engine is the best example yet of the continuous refinement in performance and efficiency that has been part of the small-block’s legacy since day one,” said Sam Winegarden, chief engineer of small-blocks. “The small-block V-8 not only is a viable and relevant engine in today’s market, but technology such as Displacement on Demand demonstrates its adaptability in the face of evolving marketplace expectations.”

DOD has the capability of disabling the combustion process of half the engine’s cylinders in certain driving conditions, enabling fuel savings of 6 percent to 8 percent. The process is instantaneous and virtually imperceptible, and the engine delivers horsepower and torque bands comparable to previous non-DOD small-block engines.

A car version of the Gen IV engine without DOD will debut in the 2005 Chevrolet Corvette.

GM Powertrain estimates that by the end of the 2005 model year, more than 90 million small-block-based engines will have been produced since the original engine’s 1955 introduction. "

 

[LMN8R]

http://www.corvetteactioncenter.com/forums/showthread.php?s=&threadid=38674

 

[Hib Halverson]

The problem with Displacement on Demand on the 2005 car---and any vehicle lacking the underchassis volume for some special exhaust components---is when running as a V4 the exhaust sound is not attractive.

For now, the only engine to get DoD in MY05 is the aluminum 5.3 in the long-wheelbase models of GM's mid-sized utilities.

06 will probably bring it to some full-sized trucks and expand it to a new 3.9L V6 engine that's coming. In V6 applications the system, when enabled, runs as an in-line 3.

 

[Runge_Kutta]

It is scary to me when the DoD decision is made based on the
attractiveness of the sound. I bet the 6.4L engine with DoD
would get the same EPA mileage numbers as the 6.0L without
DoD. Personally, I'd much prefer the 6.4L with DoD.

Of course, what we would all like to know are the details of the
3V, Gen IV engines. Does Orbital Engineering have a place in this
story? What, exactly, is McLaren doing on these 3V engines in
modest quantities to differentiate itself from volume production
of other 3V engines. If the Corvette team was unwilling to use
DoD in MY2005, can we expect the 3V engines for later C6's will
also pass on DoD?

 

[LMN8R]

;stupid

Agreed. More info will be nice on the Gen IV small block Chevy. I am glad to hear, however, that there is no plan for DOD on the Vette.