Abstract: Systems are provided for an engine block assembly comprising a cylinder block, bearing caps and crankshaft main bearings. In one example, an engine block assembly may comprise a cylinder block, a bearing cap bolted to the cylinder block, the bearing cap comprising: a first recess included in a first surface, a second recess included in a second surface opposite the first surface, and a thrust surface interfacing with a crankshaft bearing, where a rigidity of the thrust surface may vary along an axial profile of the thrust surface due to the first and second recesses. When the bearings caps are bolted to the cylinder block, the thrust surface may bend due to its variable rigidity, and as such may induce a bend in an axial profile of the crankshaft bearing to a more convex shape.

Abstract: Methods and systems are provided for engine misfire detection. In one example, a method may include sampling crankshaft fluctuations with a first and a second sampling window, wherein the first and second windows overlapping each other; and identify misfire based on the sampled signals. The method may further comprise adjusting engine operation responsive to the misfire indication via a control unit.

Abstract: An engine has a connecting rod with a big end dimensioned such that a lower face height is a function of an upper face height, a face-to-face width, and a strap height and width. First and second bearing shells are received by the big end under a specified clamp load to form a convex axial profile in response to the big end dimensions, and a crankshaft crank pin interfaces with the convex axial profile. A method of assembling a connecting rod includes inserting upper and lower bearing shells into a big end having a lower face height as a function of an upper face height, a face-to-face width, and a strap height and width, where each shell has a free state with a straight axial profile and uniform cross-section, and fastening a cap at a specified load to form a convex axial profile of the upper and lower bearing shells.

Abstract: An engine has a connecting rod with a big end dimensioned such that a lower face height is a function of an upper face height, a face-to-face width, and a strap height and width. First and second bearing shells are received by the big end under a specified clamp load to form a convex axial profile in response to the big end dimensions, and a crankshaft crank pin interfaces with the convex axial profile. A method of assembling a connecting rod includes inserting upper and lower bearing shells into a big end having a lower face height as a function of an upper face height, a face-to-face width, and a strap height and width, where each shell has a free state with a straight axial profile and uniform cross-section, and fastening a cap at a specified load to form a convex axial profile of the upper and lower bearing shells.

Abstract: Systems are provided for an engine block assembly comprising a cylinder block, bearing caps and crankshaft main bearings. In one example, an engine block assembly may comprise a cylinder block, a bearing cap bolted to the cylinder block, the bearing cap comprising: a first recess included in a first surface, a second recess included in a second surface opposite the first surface, and a thrust surface interfacing with a crankshaft bearing, where a rigidity of the thrust surface may vary along an axial profile of the thrust surface due to the first and second recesses. When the bearings caps are bolted to the cylinder block, the thrust surface may bend due to its variable rigidity, and as such may induce a bend in an axial profile of the crankshaft bearing to a more convex shape.

Abstract: Methods and systems are provided for engine misfire detection. In one example, a method may include sampling crankshaft fluctuations with a first and a second sampling window, wherein the first and second windows overlapping each other; and identify misfire based on the sampled signals. The method may further comprise adjusting engine operation responsive to the misfire indication via a control unit.