Nissan 240SX – KA24E Engine Basics

Nissan 240SX models made before February of 1989 utilized the KA24E engine. This engine has 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 engine uses Sequential Electronic Fuel Injection (SEFI). The ECM controls each injector individually, releasing fuel into each cylinder on its intake stroke.

The Nissan 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.

KA24E Specifications

Displacement2.4 L
TypeSOHC Inline 4-cylinder
3 valves per cylinder
MaterialsCast Iron Block
Cast Aluminum Heads
Cast Aluminum Intake Manifold
Bore x Stroke89.0 mm x 96.0 mm
Compression Ratio8.6:1 (9.1:1 for early 1989 240SX)
Power140 hp @ 5600 RPM
Torque152 lb. ft. @ 4400 RPM
Redline6500 RPM
KA24E Valvetrain