Why has'nt the variable displacement,internal combustion,engine design made it into production?

Question

Seems that the ERDA patent engine is right for these times.This engine upgraded to present tech will offer at least a 75% increase in fuel mileage over any common small displacement V-8,(5 liter) engine with that power still available. What gives?

Answer 1

Cadillac's North Star engine has been using a variable displacement technology for a loooong time.

Answer 2

don't know, due to downfall in economy, production is reduced as well as research in development=longer wait. Sorry, but could you help me with my question?

http://answers.yahoo.com/question/index;...

Answer 3

It has.

Many modern V-8 engines shut off cylinders at highway speeds to save fuel. The technology has been around for a while. The first car I remember to have it were the Cadillac's of the early 1980s.