Nissan 240SX - Basics
240SX models made before February of 1989 utilized the KA24E with a 9.1:1 compression ratio, outputting approximately 150 hp. After February of 1989, however, the compression ratio was reduced to 8.6:1 causing the KA24E to produce the advertised 140 hp.
The KA24E uses Sequential Electronic Fuel Injection (SEFI). The ECM controls each injector individually, releasing fuel into each cylinder on its intake stroke.
The KA24E is a reliable engine that can withstand substantial power increases on stock internals. This is due to the use of forged connecting rods and an internally balanced one-piece cast crankshaft.