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2.4L 16v - KA24DE
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2.4L 16v - KA24DE
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Set of 4 forged 4340 connecting rods for the Nissan 2.4L KA24 (240SX).
The Nissan KA24 is a 2.4-litre naturally aspirated inline-four, produced from 1989 to 2004. With a displacement of 2,389 cc (89 mm bore x 96 mm stroke), it came as the SOHC KA24E and then the DOHC 16-valve KA24DE, which breathes better at high rpm. Its long-stroke design favours low and mid-range torque, and its sturdy bottom end earned it a reputation for outstanding durability.
The KA24DE mainly powered the Nissan 240SX (S13 and S14) and the North American Silvia, producing around 155 hp. Naturally aspirated as standard, it is one of the most popular tuning platforms in drift and motorsport: as soon as forged pistons, higher rpm or, above all, a turbocharger are added, the factory rod reaches its limits. It is then replaced by reinforced 4340 forged connecting rods that secure the bottom end.
Machined from high-strength 4340 steel, reinforced forged connecting rods strengthen the bottom end as soon as power rises. They become essential when switching to forged pistons, raising the rev limit, increasing boost pressure or gaining displacement, all cases where the original rod reaches its limits.
Designed to withstand the high stresses of tuned engines (turbocharged and supercharged alike), these forged connecting rods cover every discipline (rally, drift, drag, circuit and track days, hillclimb, time attack) and support Stage 2, Stage 3 and Stage 4+ builds, up to full competition engines.
| Reference | Brand | Profile | Bolts | Pin diameter OEM 21 mm | Small-end width | Big-end diameter OEM 52,98 mm | Big-end width | Center-to-center OEM 164,97 mm | Weight per rod |
|---|---|---|---|---|---|---|---|---|---|
| 14006-4 | Manley | H | ARP 2000-3/8"-38mm | 21 mm | 52,98 mm | 24,71 mm | 164,97 mm | 615 g | |
| 14401-4 | Manley | I-HD | ARP 2000-3/8"-38mm | 21 mm | 52,98 mm | 24,71 mm | 164,97 mm | 630 g |
| Rod | Bolts | Torque | Recommended stretch |
|---|---|---|---|
| Manley (14006-4) | ARP 2000 | 81,3 N·m | 0,147 – 0,157 mm |
| Manley (14401-4) | ARP 2000 | 81,3 N·m | 0,147 – 0,157 mm |
Manufacturers recommend the stretch-gauge method as the reference: the instructions supplied with the kit always take precedence. The torque figures correspond to assembly with ARP lubricant.
| 4340 steel is a nickel-chromium-molybdenum alloy steel used in aerospace and motorsport alike. Forged then heat-treated (quench and temper), it offers excellent tensile strength, high fatigue resistance and real ductility. Compared with an original rod (often sintered/powder metal, optimised for series-production cost), a 4340 forged rod shows roughly +19% higher yield strength, +8% higher tensile strength and above all +19% to +37% higher fatigue strength, i.e. a fatigue life under cyclic loading several times longer. This is what makes forged 4340 the reference material as soon as boost and rpm climb. |
 | I-beam profile. With its thinner central section, the I-beam rod is lighter: less inertia and freer rev pick-up. It is the preferred profile on modern turbo engines like the KA24. Its I-HD (Heavy Duty) version is a reinforced variant, designed for higher loads. |
 | H-beam profile. “H”-shaped section offering great rigidity and excellent resistance to bending and compression. Slightly heavier than an I-beam, it favours strength: the choice for high-torque engines, large displacements and drag. On a torque-oriented, reliability-focused KA24, it is a safe bet. |
The rod bolt is one of the most heavily stressed parts in the engine. The key is to match the ARP grade to the real use of the build, then to strictly follow the assembly torque and stretch.
 | ARP 2000 (tensile strength ~220,000 psi, i.e. ~1,517 MPa) is the high-performance standard. Suited to builds up to 150 hp per cylinder with 5/16" bolts or 200 hp per cylinder with 3/8" bolts, and up to 8,500 rpm, it is the most common grade in circuit, track days, drift, rally, drag and hillclimb, recognised for its strength, reliability and versatility, with no particular storage constraints. |
In addition to torque tightening, measuring rod-bolt stretch is the most reliable check for optimal preload. The check is done with the bolt fitted: place the gauge (dial indicator) on the two ends of the bolt and read its actual stretch, which must match the recommended value (see the torque & stretch table above). This method removes the friction variations inherent in torque tightening and secures the assembly on heavily stressed engines. |
 | MANLEY, an American forged connecting rod manufacturer since 1966. Machined from vacuum-degassed aerospace-grade 4340 steel, shot-peened and inspected one by one, its “Turbo Tuff” rods come in H-beam and I-beam profiles, with ARP 2000 or Custom Age 625+ bolts. A major name in engine building, from street to competition. |
 | 1) Small end 2) Small-end diameter 3) Rod beam 4) Rod bolt 5) Big end 6) Rod nut / bolt 7) Rod cap 8) Big-end diameter 9) Center-to-center |
These forged connecting rods are compatible with all vehicles fitted with the Nissan KA24 engine (2.4L 16V):
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Nissan | 240SX (S13) | KA24E | 140 hp | 1989–1990 |
| Nissan | 240SX (S13) | KA24DE | 155 hp | 1991–1994 |
| Nissan | 240SX (S14) | KA24DE | 155 hp | 1995–1998 |
OEM reference: 12100-1KC0A (set of 4 rods).
When an original bottom end fails (broken, bent or scored rod), going back to the factory configuration means replacing the rods and the pistons, often damaged at the same time. The bill climbs quickly, for a simple restoration to stock.
For an equivalent budget, or even less, fitting 4340 forged connecting rods paired with forged pistons brings far greater reliability and safety margin, plus real potential for power increase. It’s the solution chosen by European engine builders for over 15 years.
For the same budget: more reliability, more potential, more longevity.
