The FA20D engine had an aluminium alloy cylinder head with chaindriven double overhead camshafts. The four valves per cylinder two intake and two exhaust were actuated by roller rocker arms which had builtin needle bearings that reduced the friction that occurred between the camshafts and the roller rocker arms (which actuated the valves).
tipped pcd inserts in 80 degree hexagon shape W for hard turning nonferrous metals of aluminum, the pcd insert cutting edges are made with polycrystalline diamond, indexable inserts with pcd working tips are precision cutting tools, which are used in cnc super fine finish machining, turning and milling automobile engine block, cylinder head, gearbox, cast aluminum alloy with silicon content
Subaru's EJ257 was a turbocharged, 2.5litre horizontallyopposed (or 'boxer') fourcylinder engine. For Australia, the EJ257 engine was introduced in the Subaru GD Impreza WRX STi in 2005 and subsequently powered the GE/GH Impreza WRX STi and V1 WRX.Effectively replacing the 2.0litre EJ207 engine, the EJ257 engine was a member of Subarus Phase II EJ engine family; key features included its
PCBN inserts for turning cast iron and hardened steel pcbn is the second hardest material in the world, and cbn related high precision cutting tools are introduced to industry, achieved high productivity and cost reductions. pcbn is the short name of polycrystalline cubic boron nitride, and pcbn inserts are mainly for the hard metal turning to replace the conventional machining way of grinding.