Description

DESCRIPTION

Two 1.42-in. (36-mm) intake valves and a single 1.61-in. (41-mm) exhaust valve per cylinder are operated by a double-width roller chain-driven camshaft per bank using roller rocker arms. Lightweight hydraulic adjusters in the rocker arms at the valves take up valve clearance for quiet operation. For minimum weight and maximum rigidity the compact rocker arms are pressure-cast aluminum. They pivot through roller bearings on rocker shafts bolted to the heads. Using computer-aided measurement and calculation techniques, valve dynamics are equivalent to that achieved by direct valve actuation through in-line tappets, but with far less friction.