[LeGrande]

Notice they claimed "up to 20%". 1 or 2% improvement is all they are likely to see (maybe). I have a dyno and I see these claims all the time. What is really interesting is to listen to the salesman's claims before and after I tell him I have a dyno. I have seen claims go from 50% improvement down to I probably wouldn't be interested, as they quickly try to get out of the conversation.

[Vn_survivor_67-68]

here is the Autoweek piece

http://www.autoweek.com/apps/pbcs.dll/article?AID=/20061221/FREE/61218008/1024/rss01

[conservatism_IS_compassion]

Notice they claimed "up to 20%". 1 or 2% improvement is all they are likely to see (maybe).

If you are talking about a gas engine throttled to control the richness at part load, this valving arrangement could eliminate the throttle valve to great effect in terms of efficiency at partial load. I once calculated the pumping work required to keep a big V-8 engine idling, and it was several horsepower just to overcome the suction on the intake side.

With this system you might switch some or all of the cylinders from a 4-stroke cycle to a 6-stroke cycle at partial load, cleaning out the products of combustion before the compression stroke much more completely than is possible in 4-stroke operation and thereby obtaining a cooler effective heat sink and better thermal efficiency. It certainly wouldn't surprise me to see a 20% improvement in operational fuel economy achieved in that way.