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Manufacture of KA24, an alternative to Z24, was launched in 1988. Its first modification, KA24E, is a four-cylinder inline engine with a cast-iron cylinder block, having a cylinder diameter of 89 millimeters. The forged crankshaft features a piston stroke of 96 millimeters plus forged connecting rods of 165 millimeters.
It gained aluminum cylinder head featuring single overhead camshaft plus two intake and one exhaust valves for each cylinder. The diameter of intake valves is 34 millimeters plus exhaust valves are 40 millimeters. Camshafts have duration 240/248 degrees, lift 10.38/10.38 millimeters. Maximum rpm equals to 6,500.
KA24E SUVs modification keeps camshaft with duration 232/232 degrees and lifts 9.7/9.7 millimeters, having maximum rpm of 6,000.
Starting from 1991, the engine was supplied with a double overhead camshaft and four valves for every cylinder. With 36.6 millimeters intake valves plus 31.3 millimeters exhaust valves, the motor was named KA24DE. Unlike KA24E, this one features restyled oil pan and oil jets, modernized pistons, and a crankshaft with a 9.5 compression index. The compression rate for SUVs was lowered to 9.2/9.3.
Before 1994, camshafts had a duration of 240/248 degrees and lifted 8.9/9.32 millimeters, leading to a maximum rpm of 6,900. In 1995, Nissan 240SX S14 gained camshafts with a period of 232/232 degrees and lifted 8.73/9.06 millimeters. Later that year, after intake manifold restyling, revs maximum descended to 6,400 rpm.
Other manufacturers utilized camshafts with 240/248 duration till 1997, when intake camshafts with 232 degrees duration replaced them. Engine’s stock injectors are 270 cc.
KA24DE for SUVs and big vehicles featured long length intake manifold and camshafts, constructed for low and mid revs. The maximum rpm was 6,100.
Having no hydraulic lifters, this motor requires regular valves adjustment. The cold engine has intake and exhaust valves clearance of 0.28-0.36 millimeters.
The timing chain must be replaced after 180,000-200,000 miles (300,000 kilometers) run. Engine firing order is 1-3-4-2.
In 2004, KA24DE production stopped due to the release of more advanced 2.5L QR25DE.
The breakdown of the engine code is as follows:
- KA – Engine Family
- 24 – 2.4 Liter Displacement
- D – DOHC (dual overhead camshafts)
- E – Multi-Point Fuel Injection