[zonker]

I'm bringing this post back from the dead. I'm seriously contemplating doing this with a Geo Metro 1.0 3 cyl.

So far what I have learned is the Miller and Atkinson engine designs are similar by limiting the intake cylinder fill by either closing the intake valve before TDC (miller cycle) or closing the intake valve after TDC (atkinson) in order to limit the amount of cylinder fill. The advantage to this comes in less volume and effort required to compress the air/fuel mixture while giving it a full amount of stroke to expel all the exhaust gases.

Since most all hybrid applications have been using the Atkinson principle, I think I will stick to that design.

My understanding is that it will be an absolute slug off the line so that is why it is integrated with the torquey electric motors of a hybrid.

A 25% power reduction can be expected when comparing Otto cycle to Atkinson so my 55 hp Geo motor will reduced to 41 hp. I can live with that if it means a 65mpg runabout with a 75 mph top speed.

So... am I the first adopter here at ecomodder or has someone else tried this before me? If so, I'd love a little sound advice.

Rob