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The EJ251 and EJ252 engines had a compression ratio of 10.
The pistons had internal cooling channels, while oil jets in the crankcase sprayed the underside of the pistons.
Cylinder head The EE20 engine had an aluminium alloy cylinder head that was 17 mm thinner than the EJ20 engine.
For the EE20 engine, all five main bearings in the cylinder block had metal matrix composite journals inserted during the cast process for rigidity and due to their similar thermal expansion to the crankshaft.
Injection and ignition The EJ251 and EJ252 engines had multi-point sequential fuel injection and centrally located spark plugs.