The static total displacement of all six combustion chambers is 0.76 liter (46 cubic inches), but the volume in which combustion occurs at full boost during the 720 degrees of rotation it takes ...

Of particular interest is the small Barnes head combustion chamber. Typically in the range of 47cc, these chambers allow the use of flat-top pistons (notched for valve clearance) and compression ...

Unfortunately, this small chamber combined with a flat-top, 6cc valve relief piston, a 0.015-inch deck, and a 0.041-inch thick gasket creates an excessive 10.6:1 ratio—too much for an iron-head ...

An Eric Weingartner YouTube video shows a head-to-head comparison of a lightly-ported 186-casting 64cc head to a Trick Flow aluminum head with 60cc combustion chambers. For reference, both heads ...

The first step was the design, manufacture, and operation of a small-scale, capacitively cooled, annular combustion chamber. The copper alloy combustion chamber has an outer diameter of 68 mm and the ...