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2.3L 16v - MZR DISI
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2.3L 16v - MZR DISI
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Set of 4 forged 4340 steel connecting rods for the Mazda 2.3 16V Turbo L3-VDT.
The L3-VDT is the turbocharged version of Mazda’s 2.3-litre MZR four-cylinder. With direct petrol injection (DISI system) and a turbocharger it produces around 260 hp (up to 263 hp / 267 PS depending on the market) and torque close to 380 N·m. Its actual displacement is 2,261 cc (bore 87.5 mm, stroke 94 mm).
Introduced in 2005 on the Mazda 6 MPS, it then powered the Mazda 3 MPS and the Mazda CX-7 until 2013. A favourite among tuners, this block gains power quickly through ECU mapping and higher boost, at which point the rotating assembly becomes the critical part to reinforce.
Forged from 4340 alloy steel and precision-machined, these Manley rods replace the factory rods to withstand power and engine speeds far beyond stock. Forging aligns the metal grain and removes porosity, giving far better fatigue strength than a cast part.
This listing covers the rods with a 22.5 mm piston pin. Three profiles are offered: H, H-HD (reinforced H) and I-HD (reinforced I), each with ARP 2000 or ARP CA625+ bolts. The centre-to-centre length matches the OEM figure (150.55 mm) for a direct fit with suitable forged pistons. Built for heavily tuned turbo engines, they cover every discipline (rally, drift, drag, circuit and track days, hillclimb, time attack) and support Stage 2, Stage 3 and Stage 4+ builds, right up to full competition engines.
| Reference | Brand | Profile | Bolts | Pin diameter OEM 22 mm | Small-end width | Big-end diameter OEM n.p. | Big-end width | Centre distance OEM 150.55 mm | Weight per rod |
|---|---|---|---|---|---|---|---|---|---|
| 14032-4 | Manley | H | ARP 2000-3/8"-38mm | 22,5 mm | 55,02 mm | 21,82 mm | 150,55 mm | 610 g | |
| 15032-4 | Manley | H-HD | ARP 2000-3/8"-38mm | 22,5 mm | 55,02 mm | 21,82 mm | 150,55 mm | 640 g | |
| 15032R6-4 | Manley | H-HD | ARP CA625+-3/8"-38mm | 22,5 mm | 55,02 mm | 21,82 mm | 150,55 mm | 640 g | |
| 14432-4 | Manley | I-HD | ARP 2000-3/8"-38mm | 22,5 mm | 55,02 mm | 21,82 mm | 150,55 mm | 600 g | |
| 14432R6-4 | Manley | I-HD | ARP CA625+-3/8"-38mm | 22,5 mm | 55,02 mm | 21,82 mm | 150,55 mm | 600 g |
| Reference | Bolts | Max torque (no gauge) | Stretch (with gauge) |
|---|---|---|---|
| 14032-4 | ARP 2000 | 81,3 N·m | 0,147 – 0,157 mm |
| 15032-4 | ARP 2000 | 81,3 N·m | 0,147 – 0,157 mm |
| 15032R6-4 | ARP CA625+ | 88,1 N·m | 0,160 – 0,170 mm |
| 14432-4 | ARP 2000 | 81,3 N·m | 0,147 – 0,157 mm |
| 14432R6-4 | ARP CA625+ | 81,3 N·m | 0,160 – 0,170 mm |
Manufacturers recommend the stretch-gauge method over torque setting: measuring bolt stretch is what guarantees correct preload. A stretch gauge is essential for a reliable build.
| 4340 is a nickel-chromium-molybdenum alloy steel known for its excellent balance of strength, toughness and fatigue resistance. It is the reference material for performance rods: it withstands high combustion pressures and engine speeds without lasting deformation. Against a series sintered-metal rod, forged 4340 shows about +19% more yield strength, +8% more tensile strength and +19 to +37% more fatigue life, a decisive gain under the repeated loads of a boosted engine. |
 | H profile. The “H” section offers high rigidity and excellent resistance to heavy loads: it is the preferred profile for high-torque turbo engines. The H-HD (Heavy Duty) version adds material for the most extreme builds. |
 | I-HD profile. A reinforced I-beam rod (Manley Pro Series I-Beam Turbo Tuff): its more compact central section reduces weight while keeping great strength, a good choice for gaining rpm without sacrificing reliability. |
The rod bolt is one of the most heavily loaded parts of the engine: it holds the cap during load reversals at high rpm. Two ARP grades are available on these rods. They cover the widest range of turbo builds, from track to drift, drag and rally, and are chosen according to the targeted power.
 | ARP 2000 is a wrought low-alloy steel, treated through the section, with tensile strength settling around 220,000 psi, i.e. ~1,517 MPa. Its threads are rolled after heat treatment, which work-hardens the thread root and gives excellent cyclic fatigue endurance; chemically stable, it imposes no storage condition. The grade is rated up to 200 hp per cylinder in 3/8" and up to 8,500 rpm: it is the most common in circuit racing, trackdays, drift, rally, drag and hillclimb. On this L3-VDT with a 22.5 mm pin it equips all three Manley profiles offered, H, H-HD and I-HD, in 3/8"-38 mm. |
 | CA625+ (Custom Age 625+) is ARP's premium alloy: its tensile strength ranges from 260,000 to 280,000 psi, i.e. ~1,793 to 1,931 MPa, thanks to an age-hardened grade and a dedicated heat treatment, with threads rolled after treatment. It targets the most extreme builds, beyond 250 hp per cylinder in 3/8" and beyond 10,000 rpm. Its chemistry gives it better resistance to atmospheric corrosion and oxidation than ARP 2000, and it is immune to hydrogen embrittlement. On this L3-VDT it is offered on the Manley H-HD and I-HD in 3/8"-38 mm. |
ARP rod bolts available separately: ARP bolts 3/8" x 38 mm.
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. |
On the L3-VDT, tightening to torque only gives an indirect picture of the preload: thread friction, the cleanliness of the tapped hole and the assembly lubricant make the result vary from one bolt to the next. Measuring stretch removes those variations.
Method: take the free length of each bolt with a stretch gauge before assembly, then check the length under load. The stretch obtained must stay within the range given by the hardware manufacturer, i.e. 0,147 – 0,157 mm with ARP 2000 and 0,160 – 0,170 mm with ARP CA625+, the values shown in the torque and stretch table on this page. Clean threads and the recommended lubricant are essential to obtain a repeatable reading on every bolt. |
 | 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 rods fit vehicles equipped with the Mazda 2.3L 16V Turbo L3-VDT (MZR 2.3 DISI) engine, with a 22.5 mm piston pin.
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Mazda | Mazda 3 MPS (BK) | L3-VDT | 260 hp | 2007–2009 |
| Mazda | Mazda 3 MPS (BL) | L3-VDT | 260 hp | 2009–2013 |
| Mazda | Mazda 6 MPS (GG) | L3-VDT | 260 hp | 2005–2007 |
| Mazda | CX-7 (ER) 2.3 DISI Turbo | L3-VDT | 260 hp | 2007–2012 |
OEM reference: L3K9-11-210A (alt. L3K9-11-210B) (set of 4 connecting rods)
On a Mazda 2.3 L3-VDT (MZR DISI), a failing stock connecting rod usually takes the piston with it and scores the block: fully rebuilding a wrecked bottom end costs far more than fitting a set of forged rods as a preventive measure.
For a controlled budget, Manley forged 4340 connecting rods secure the build, cope with rising boost pressure and prevent failures at high power. Rather than risking the block, you make the engine reliable for the long run while keeping headroom to push further: it is by far the most economical choice over time.
