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1.6L 16v - 4A-GE
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1.6L 16v - 4A-GE
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Set of 4 forged 4340 steel connecting rods for the Toyota 4A-GE 1.6 16v & 20v, 20 mm pin.
Introduced in 1983, the 4A-GE is the sporting member of Toyota's A family: a 1.6-litre (1587 cc) inline-four with twin overhead camshafts and 16 valves, taken to 20 valves on the later generations, with an 81 mm bore and a 77 mm stroke. A naturally aspirated block famed for its eagerness and love of high revs, it was built until 2002 and went through several evolutions, from the early "big port" to the 20V Silvertop and Blacktop versions with variable valve timing. It powered a long line of Toyota models: Corolla AE86, MR2 AW11, Celica, Carina, Corona and Sprinter.
The 4A-GE owes much of its legend to the Corolla AE86, a light rear-wheel-drive car that became an icon of drift and Japanese car culture. That aura made it one of the most tuned blocks in the world: individual throttle bodies (ITB), aggressive camshafts, raised compression and rpm beyond 8,000, with some builds even converting to forced induction. But as soon as engine speed and load climb well past factory values, the stock rods become the weak link of the reciprocating assembly. Replacing them with forged rods is the decisive step to reliably secure a high-revving or heavily built 4A-GE.
Our forged 4A-GE rods are machined from wrought 4340 steel, the reference alloy in motorsport. They suit every discipline: circuit, drift, rally, drag, time attack and hillclimb, and support a high-revving naturally aspirated 4A-GE as well as a heavily built engine. Depending on the target (Stage 1 reliability, Stage 2 tuning, Stage 3 high power and beyond), they lock in the power increase without ever cutting corners on reliability. Supplied as a weight-matched set of 4, they keep the 4A-GE's 20 mm piston pin and 122 mm center-to-center length.
Compared with a cost-driven sintered factory rod, a forged 4340 rod delivers about +19% yield strength, +8% tensile strength and +19 to +37% fatigue endurance. That mechanical reserve lets a 4A-GE pushed in rpm absorb cylinder-pressure peaks and the inertia loads typical of high engine speeds without breakage. The entire range is made from this forged 4340 steel, proven on the most demanding builds.
| 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) |
|---|---|---|---|---|---|---|---|---|---|
| R-TOY-004-I | ZRP | I-HD | ARP 2000-3/8"-38mm | 20 | 45 | 21,85 | 122 | 435 | |
| R-TOY-004-I-L19 | ZRP | I-HD | ARP L19-3/8"-38mm | 20 | 45 | 21,85 | 122 | 435 |
Torque and stretch depend on the chosen bolt reference; refer to the datasheet supplied with the kit. Checking stretch with a gauge remains the most reliable and repeatable method to guarantee preload.
| Reference | Brand | Rod bolts | Max torque (no gauge) | Stretch (gauge check) |
|---|---|---|---|---|
| R-TOY-004-I | ZRP | ARP 2000-3/8"-38mm | 61 | 0,140 à 0,152 |
| R-TOY-004-I-L19 | ZRP | ARP L19-3/8"-38mm | 67,8 | 0,152 à 0,165 |
| 4340 is a low-alloy steel with nickel, chromium and molybdenum. Forging aligns the metal fibres in the direction of load, closes 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 together with high fatigue endurance, essential as soon as the engine gains torque, power or revs. This is the material used across our entire 4A-GE range. |
 | The I-HD profile (ZRP) is a reinforced version of the I-beam, combining lightness with high compression resistance. Machined from 4340 steel, it suits the 20 mm pin 4A-GE built for high rpm, and is available with ARP 2000 or L19 bolts. |
 | ARP 2000: the all-round benchmark alloy, with a tensile strength of about 220,000 psi (1,517 MPa). Offered here in 3/8" diameter, it covers the vast majority of 4A-GE builds, up to about 200 hp per cylinder and speeds reaching 8,500 rpm. It is the default choice to make a sporting 4A-GE reliable. |
 | ARP L19: a very-high-strength, stiffer steel intended for the most heavily stressed 4A-GE engines, up to about 250 hp per cylinder and the highest engine speeds. In 3/8" diameter it clearly widens the safety margin on hard builds (note: corrosion-sensitive, it requires careful storage). |
| On a forged rod, the exact bolt preload is checked by its stretch, measured with a dial gauge (stretch gauge), rather than by torque alone: lubrication and run-in distort the torque reading. Always refer to the stretch values given by the bolt manufacturer. |
 | For this 4A-GE range the selected brand is ZRP, competition forged connecting rods designed by Alex Drakos in Athens. Forged from 4340 steel, then machined and matched to ±1 g, each rod keeps its balance at high rpm. Here it comes in an I-HD profile with ARP 2000 or L19 hardware. Engineered and inspected in Greece, these rods have proven themselves in rally, on track and in drift, for the best price-to-performance ratio. |
 | 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 the Toyota models powered by the 1.6 L 16v (and 20v) 4A-GE inline-four, with a 20 mm pin and 122 mm center-to-center:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Toyota | Corolla (AE86) | 4A-GE | 124 ch | 1983–1987 |
| Toyota | Corolla (AE92) | 4A-GE | 116–125 ch | 1987–1994 |
| Toyota | Corolla / Levin (AE101) | 4A-GE (20V) | 156–160 ch | 1991–1998 |
| Toyota | Corolla / Levin (AE111) | 4A-GE (20V) | 165 ch | 1995–2000 |
| Toyota | Sprinter / Trueno (AE82 / AE86) | 4A-GE | 124 ch | 1983–1987 |
| Toyota | Celica (AA63 / ST162) | 4A-GE | 124–125 ch | 1983–1989 |
| Toyota | Carina (AT171) | 4A-GE | 120–140 ch | 1988–1992 |
| Toyota | Carina GT (AT210) | 4A-GE (20V) | 165 ch | 1996–2001 |
| Toyota | Corona Coupé (AT160) | 4A-GE | 131 ch | 1985–1987 |
| Toyota | MR2 (AW11) | 4A-GE | 116–131 ch | 1984–1990 |
| Geo | Prizm 1.6 GSI | 4A-GE | 132 ch | 1989–1992 |
On a tuned 4A-GE, a stock rod that lets go usually takes the block, crankshaft and pistons with it. 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, in intensive use as much as day to day.
