Subaru’s EJ251 and EJ252 were 2. BP Liberty and BP Outback, the EJ251 was replaced by panera green goddess dressing EJ252 engine. Beyond these changes, however, the EJ251 and EJ252 engines are understood to have the same general attributes.
The Subaru EJ251 and EJ252 engines had an aluminium alloy block with 99. 0 mm stroke for a capacity of 2457 cc. The cylinder block for the EJ251 and EJ252 engines had an open-deck design whereby the cylinder walls were supported at the three and nine o’clock positions. The crankcase for the EJ251 and EJ252 engines had five main bearings and the flywheel housing was cast with the crankcase for increased rigidity. Like other EJ Phase II engines, the crankshaft thrust bearing was positioned at the rear of the crankshaft to reduce the transfer of natural engine frequencies to the transmission and driveline. The EJ251 and EJ252 engines had cast aluminium pistons. Relative to their EJ Phase I predecessors, the pistons for the EJ251 and EJ252 engines had reduced piston pin offset and a molybdenum coating to reduce friction.
Other features of the pistons included solid-type piston skirts, flat top combustion surfaces and reduced top land to cylinder clearance. The EJ251 and EJ252 engines had an aluminium alloy cylinder head with cross-flow cooling. Due to the cylinder head offset, the left camshaft was longer than the right camshaft to align the cam belt sprockets. Both camshafts were driven by a single belt which had round profile teeth for quiet operation and was constructed of wear-resistant double canvas and heat resistant rubber materials with a wire core. The EJ251 and EJ252 engines had multi-point sequential fuel injection and centrally located spark plugs. The EJ251 and EJ252 engines had a compression ratio of 10.
