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2.4L 16v - 2AZ-FE
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2.4L 16v - 2AZ-FE
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The 2AZ-FE is Toyota's 2.4-litre inline-four with dual overhead camshafts and 16 valves. Built around a 2362 cc aluminium block (88.5 mm bore, 96 mm stroke), this naturally aspirated engine produces between 152 and 170 hp depending on the version. Made from the early 2000s to the mid-2010s, it powered a very wide range of models: Camry, RAV4, Previa/Estima, Harrier, Alphard/Vellfire, Mark X Zio and Corolla Rumion, as well as the Scion tC, hugely popular in North America.
Its wide availability makes it a common tuning base, especially for turbo conversions where the goal is to extract far more than stock power. But as soon as boost pressure or engine speed is raised, the factory rods become the weak link of the bottom end. Replacing them with forged rods is the key step to reliably strengthen the reciprocating assembly.
Our 2AZ-FE forged rods are machined from wrought 4340 steel, the reference in motorsport. They handle fatigue, bending and pull-out far better than factory rods, while strictly respecting the dimensions of the 2AZ-FE crankshaft and pistons. Supplied as a set of 4 and fitted with high-strength ARP bolts, they are ready to install.
They suit every tuning programme: turbo conversion, higher compression ratio, drift, drag, circuit, time attack or simply the reinforced rebuild of a tired engine. Depending on the goal (Stage 1 reliability, Stage 2 moderate boost, Stage 3 high power), the forged rod secures the power increase without ever compromising reliability.
| Reference | Brand | Profile | Rod bolts | Ø pin (mm) | Small-end width (mm) | Ø big end (mm) | Big-end width (mm) | Center-to-center (mm) | Weight (g) |
|---|---|---|---|---|---|---|---|---|---|
| 14419-4 | Manley | I-HD | ARP 2000-3/8"-41mm | 22 | 51 | 19,91 | 149,5 | 570 |
| Reference | Brand | Rod bolts | Max torque (no gauge) | Stretch (gauge check) |
|---|---|---|---|---|
| 14419-4 | Manley | ARP 2000-3/8"-41mm | 81,3 N·m | 0,147 – 0,157 mm |
The torque figure applies to tightening carried out without a stretch gauge. For optimal preload, ARP recommends checking bolt-body stretch with a micrometric gauge, a more reliable and repeatable method than torque alone.
| 4340 is a low-alloy steel with nickel, chromium and molybdenum. Forging aligns the metal fibres in the direction of load, which eliminates internal porosity and delivers far greater mechanical strength than a factory sintered or cast rod. The result is a tensile strength of around 930 to 1080 MPa with excellent fatigue resistance, essential as soon as the engine gains power or revs. It is the standard for competition rods, able to absorb combustion-pressure peaks without deforming or breaking. Against a series sintered-metal rod, forged 4340 delivers roughly +19% more yield strength, +8% more tensile strength and +19 to +37% more fatigue resistance, a margin that translates into markedly greater endurance under repeated loads. |
 | The I-HD profile (I-Beam Heavy Duty) keeps the I-section, prized for its excellent stiffness-to-weight ratio, and reinforces it to withstand higher loads. This geometry limits reciprocating mass, which favours higher engine speed, while retaining the strength required under boost. Our 2AZ-FE rods are offered exclusively in the I-HD profile, particularly suited to turbo builds of this four-cylinder. |
 | Rod bolts are a critical component: they keep the cap and rod body together on every cycle. Our 2AZ-FE rods use ARP 2000 bolts in 3/8" diameter. ARP 2000 is a high-strength alloy steel offering a tensile strength of about 220,000 psi (around 1517 MPa). In 3/8" diameter it covers roughly 200 hp per cylinder and withstands high engine speeds, up to 8500 rpm. These bolts bring strength, reliability and versatility, with no particular storage constraint. |
| Torque tightening remains approximate because it depends on thread friction. The most accurate method is to measure bolt-body stretch with a micrometric gauge: you tighten until the specified stretch is reached, here 0.147 to 0.157 mm. This guarantees an even preload across the four rods and maximum reliability at high rpm. |
 | Manley Performance is an American manufacturer recognised for decades for its high-performance engine components. Its forged 4340 rods, here in the I-HD profile, are known for their machining quality, weight consistency and endurance under severe use. It is the brand chosen to equip the 2AZ-FE. |
 | 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 |
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Toyota | Camry (ACV30 / ACV36) | 2AZ-FE | 152 ch | 2001–2006 |
| Toyota | Camry (ACV40) | 2AZ-FE | 158 ch | 2006–2011 |
| Toyota | RAV4 III (ACA31 / ACA33) | 2AZ-FE | 170 ch | 2005–2013 |
| Toyota | Previa / Estima II (ACR30) | 2AZ-FE | 156 ch | 2000–2006 |
| Toyota | Harrier (ACU35) | 2AZ-FE | 160 ch | 2003–2012 |
| Toyota | Alphard / Vellfire (ANH20 / ANH25) | 2AZ-FE | 170 ch | 2008–2014 |
| Toyota | Mark X Zio (ANA10 / ANA15) | 2AZ-FE | 163 ch | 2007–2013 |
| Toyota | Corolla Rumion (AZE151) | 2AZ-FE | 167 ch | 2010–2015 |
On a tuned 2AZ-FE, a stock rod that lets go usually destroys the block, crankshaft and pistons. Investing in a forged rod set from the outset costs far less than an engine failure followed by a full rebuild. You permanently strengthen the bottom end, preserve the value of your build and drive with peace of mind, on track as much as on the open road.
