miller cycle... Can this be setup on any supercharged engine?

[Radar]

In the Miller cycle, the intake valve is left open longer than it would be in an Otto cycle engine. In effect, the compression stroke is two discrete cycles: the initial portion when the intake valve is open and final portion when the intake valve is closed. This two-stage intake stroke creates the so called "fifth" stroke that the Miller cycle introduces. As the piston initially moves upwards in what is traditionally the compression stroke, the charge is partially expelled back out the still-open intake valve. Typically this loss of charge air would result in a loss of power. However, in the Miller cycle, this is compensated for by the use of a supercharger. The supercharger typically will need to be of the positive displacement (Roots or Screw type) type due to its ability to produce boost at relatively low engine speeds. Otherwise, low-rpm torque will suffer.

A key aspect of the Miller cycle is that the compression stroke actually starts only after the piston has pushed out this "extra" charge and the intake valve closes. This happens at around 20% to 30% into the compression stroke. In other words, the actual compression occurs in the latter 70% to 80% of the compression stroke.

Could any supercharged engine, using a the correct large duration intake cam with a reasonable duration exhaust cam, be setup so its a miller cycle??

[the_random_hero]

In my researching into implementing it (on a 4AGE), I was told that unless your car has controllable cam timing don't bother as it becomes a lot less efficient at certain rev ranges.
IMO, just run E85.

[TERRA Operative]

What's the benefits of this sort of setup?

[Radar]

Check out the miller cycle bit it explains it reasonably..
http://www.autozine.org/technical_sc...ne/petrol2.htm

Mazda's Miller Cycle engine 2.3L V6 burns 13% less fuel than its 3 L conventional sister engine. It also generates more power and better torque curve.

http://www.examiner.com/x-1060-Orlan...erCycle-engine

Initially, this sounds like a terrible idea. What good could possibly result from pumping in all that air, and then pushing it right back out?
The answer is simple: to take some of the load off the engine, thus giving it more power and increasing its efficiency.

[Norbie]

This is an expensive way to slightly improve fuel efficiency. I wouldn't bother.

[Radar]

No worries, just was curious about it...