Abstract: The chain guide of the present invention, which will be utilized on the tight side of the chain of an engine system, is designed to reduce the lateral motion of the chain. The chain guide is constructed with raised side rails that taper inward to the center. The slot which guides and controls the chain gradually narrows towards the center.

Abstract: A chain and sprocket system includes a plurality of chains and sprockets. The system includes a crankshaft, an idler shaft and two overhead camshafts. The two sprockets on the idler shaft that connect by chain to drive the camshafts are phased or offset with respect to each other to alter the impact and chordal action generated noise. These idler camshaft sprockets and the idler sprocket of the crankshaft are all manufactured separately and then placed together on a spline or hub. In this way, the idler sprocket assembly consists of four parts, which eases manufacture and assembly.