Turbo and BSFC

[ksstathead]

I'm surprised the drop is not bigger from 55 to 75. 4/26=15%.

[MPGranger]

Originally Posted by xcel

The RDX just like many of the Honda engines of recent build includes an Atkinson based low RPM cam and running a DWL sequence taking advantage of that should easily see you blow through 34 mpg.

I thought the big thing with atkinson engines was the trick connecting rod allowing four cycles in 360 crank rotation, instead of the otto cycle's 720 degrees

[some_other_dave]

Originally Posted by pickler

im not sure what afcd is but i do have an scangauge 2.

average Fuel Consumption Display.

Originally Posted by MPGranger

I thought the big thing with atkinson engines was the trick connecting rod allowing four cycles in 360 crank rotation, instead of the otto cycle's 720 degrees

That was the original Atkinson engine. Modern usage started out as "pseudo-Atkinson" or "Atkinson-like" and to describe a modification of the Otto cycle, and eventually the modifiers were dropped and now most are just calling it "Atkinson". Valve timing gets monkeyed with so that the expansion cycle is longer than the compression cycle, generally by leaving the intake valve open longer so some of the intake charge gets pushed back out into the intake port.

http://en.wikipedia.org/wiki/Atkinso..._cycle_engines

-soD