Patent ID: 6832589
Filing Date: 2004-12-21
Classification: F02B,F02F,F02P,Y02T

Abstract:
An internal combustion engine for powering an aircraft, the internal combustion engine comprising:a cylinder head having a cylindrical head bore and a high swirl port integrally formed therein, said cylinder head fixedly attached to a top end of a cylinder barrel formed with cylindrical walls, the cylinder bore and the cylindrical walls defining a cylinder, said cylinder head bore having an outwardly protruding cavity with respect to the top end of the cylinder barrel, wherein said cavity is a bell-shaped dome; a piston having a piston crown, said piston contained within the cylinder, said piston crown, said cylinder walls, and said cylinder head bore defining a combustion chamber, said piston crown having a concavity formed therein, and the piston construction arranged to reciprocate within the cylinder; said concavity of the piston crown and said cavity cooperating at a top dead center position of the piston to form a swirl chamber; said piston crown having formed along a peripheral edge thereof a squish area that corresponds to a second squish area formed in the cylindrical bore head, so that when said piston approaches said top dead center, said squish area and said second squish area cooperate to cause combustion gases to move radially inward of the combustion chamber and into the swirl chamber; and spark plugs extending through the cylinder head, said spark plugs each having a tip whereupon a spark is adapted to be generated, each of said tips being disposed within said swirl chamber; wherein a first spark plug of said spark plugs is tilted toward an exhaust port at an approximate angle of 19.4 degrees and a second spark plug of said spark plugs is tilted toward said exhaust port at an approximate angle of 9.9 degrees; wherein said spark plugs enter said combustion chamber at an approximate angle of 30 degrees; wherein the distance between said spark plug tips is at an approximate distance of 0.6 times the diameter of said cylinder head bore; and wherein the clearance between said squish area and said second squish area when said piston reaches said top dead center is approximately 0.047 inches.