Summary
As one might expect, there's nothing radically new in this technology. Automakers have been evaluating it for decades and General Motors offered a system on some Cadillac models during the 1980s. At that time, one powerplant was available with a 4-6-8 variable displacement arrangement, but without the computer technology we have today, it was not a huge success. This may be so, but in recent times, GM and Chrysler have introduced reliable and effective variable displacement systems using the very latest technology and for many buyers, it's the answer to their fuel economy prayers.
As an example of how systems like this work, I'll take a look at Chrysler's 2006 Hemi multi-displacement V-8 engine -- a power unit that's won wide praise and certainly rekindled the Hemi legend of the 1960s. Chrysler uses the term Multi Displacement System or MDS, while GM uses Displacement on Demand, or DOD.Chrysler points out that the MDS engine offers powerful and smooth acceleration during acceleration and trailer towing, but retains very worthwhile economy figures when cruising. I've tried one of these Hemis (and variable displacement systems from other automakers) and found it very seamless with no real indication that you've "lost" four cylinders when the technology kicks in.See the full content of this document
Extract
No Replacement for Variable Displacement
A V8 running as a four-cylinder latest fuel-saving trick
By Tony Whitney VANCOUVER -- There are several new vehicles on the market right now with what the industry calls "variable displacement," though specific automakers have t...See the full content of this document
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