[elhigh]

Guys,
It's my understanding that you could Atkinson-ize pretty much any engine just by installing a custom cam.

I know Atkinson engines aren't supposed to be any great shakes in the power department, especially at low revs, unless you've got some forced induction to make the most of what intake they do get. This is probably a much more expensive mod than I'm willing to make on my aging truck - but if I win the lottery then I might make a few phone calls and make some changes - but just thinking out loud, since I don't drive fast and don't even do that much hauling in my truck, would it in theory be a worthwhile project?

I don't know many particulars about Atkinson cycle engines, except the impressions I've already stated above. It's supposed to make the engine more fuel efficient by permitting an effectively longer expansion stroke than the compression stroke. How much bigger has anyone taken this? Are we seeing a big ratio, like 2:1, or is just a fractional increase?