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1.6L 16v - EcoBoost
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1.6L 16v - EcoBoost
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Set of 4 forged connecting rods in 4340 steel for the Ford 1.6L 16V EcoBoost.
The 1.6 EcoBoost is Ford's 1.6 L (1,596 cc) inline four-cylinder, with twin overhead cams and sixteen valves, derived from the Sigma family. With a 79 mm bore and 81.4 mm stroke, its turbocharged direct-injection version powers the Fiesta ST and the Focus 1.6 EcoBoost, with outputs from 150 to 182 hp. The same rod architecture is shared with the naturally aspirated 1.6 Ti-VCT (Fiesta, Focus), so these rods cover Ford's whole 1.6 L 16-valve range. As soon as boost, power and rpm climb, the factory fracture-split rod, designed for series production, becomes the weak point of the rotating assembly. Replacing it with weight-matched forged rods is the first safeguard of a reliable, durable 1.6 build.
Drop-forged and precision-machined, these rods absorb bending, compression and fatigue loads well beyond what the factory Ford 1.6 rod withstands. They meet every sporting use: circuit, time attack, drift, drag, rally and hillclimb. Depending on the build, they suit a reliability-focused Stage 1 as well as a Stage 2 or a Stage 3 pushed on boost. Supplied as a complete set of 4, weight-matched, they keep the balance of the four-cylinder rotating assembly. All adopt the 1.6 family's 21 mm piston pin, for a 134 mm center-to-center length.
| Reference | Brand | Profile | Bolts | Pin Ø (mm) OEM 21 mm | Small-end width (mm) | Big-end Ø (mm) OEM 47,04 mm | Big-end width (mm) | Center-to-center (mm) OEM 134 mm | Weight (g) |
|---|---|---|---|---|---|---|---|---|---|
| KCR337A-T | Wössner | I | ARP 2000-5/16"-38mm | 21 | 18,90 / 10,70 | 47,04 | 20,85 | 134 | 488 |
| R-FOR-007-I | ZRP | I | ARP 2000-5/16"-38mm | 21 | 47,04 | 20,8 | 134 | 431 | |
| R-FOR-007-I-L19 | ZRP | I | ARP L19-3/8"-38mm | 21 | 47,04 | 20,8 | 134 | 431 |
The rods gathered here do not take the same bolt diameter: the Wössner uses 5/16" ARP 2000, the ZRP uses 3/8" ARP 2000 or ARP L19. Since the allowable tension depends directly on bolt section, applying the figure of one to the other guarantees one of the two faults. The first, under-tightening, leaves preload below the force that lifts the cap: contact between rod and cap becomes intermittent, the shell is hammered, it loses its running clearance and then its grip in the bore, and the bearing runs hot. The second, over-tightening, exceeds the elastic limit of the bolt: permanent elongation, lost preload, a distorted bearing bore, an oval big end and a shell that no longer bears across its full width. The table below gives, for each rod, the fastener manufacturer's torque and stretch figures: that is the only reference to follow, row by row. Stretch measurement with a dial gauge remains the reliable method for validating the build; ARP assembly lubricant required, kit instructions taking priority.
| Rod | Bolts | Torque | Recommended stretch |
|---|---|---|---|
| Wössner I (KCR337A-T) | ARP 2000 | 40,7 N·m | 0,127 – 0,140 mm |
| ZRP I (R-FOR-007-I) | ARP 2000 | 40,7 N·m | 0,140 – 0,152 mm |
| ZRP I (R-FOR-007-I-L19) | ARP L19 | 67,8 N·m | 0,152 – 0,165 mm |
These rods are forged from 4340 low-alloy nickel-chromium-molybdenum steel, the benchmark for high-performance rods. Forged, then quenched and tempered, it keeps a continuous grain flow that gives high tensile strength and excellent fatigue life, two decisive assets on a heavily stressed 1.6 EcoBoost. Compared with a cost-optimised factory fracture-split rod, a forged 4340 rod gains about +19% yield strength, +8% tensile strength and +19 to +37% in fatigue endurance. It is precisely this margin that absorbs the torque and boost increases of a prepared 1.6 without breakage.
The range is offered in the I profile, by ZRP and Wössner. The I-beam offers an excellent stiffness-to-weight balance, particularly relevant on a boosted 1.6 where a light rotating assembly matters as much as bending resistance. Wössner offers it in its A-Beam form, an optimised I-beam. The specification table details, for each reference, the center-to-center length, big-end diameter, big-end width and weight.
 | I profile: I-beam with an optimised stiffness-to-weight ratio, very well suited to the 1.6 four-cylinder; Wössner machines it in its A-Beam form (an optimised I-beam), valued for its lightness and bending stability on high-revving engines. |
 | ARP 2000: the all-round benchmark alloy, with a tensile strength of about 220,000 psi (1,517 MPa). Offered here in 5/16" diameter, it covers the vast majority of 1.6 builds, up to about 150 hp per cylinder, at speeds reaching 8,500 rpm. Sturdy, reliable and with no storage constraints, it is the default choice for a reliable 1.6, from Stage 1 to Stage 3. |
| L19 (tensile strength ~260,000 psi, i.e. ~1,793 MPa) is designed for 1.6 engines pushed to the extreme, up to 250 hp per cylinder with 3/8" bolts, and up to 10,000 rpm: very high boost pressure, sustained high rpm and high cylinder pressure. It is the choice for big-power builds: drag racing, drift, rally and circuit use. Caution: sensitive to corrosion and hydrogen embrittlement, it must always be stored and fitted oiled, away from moisture. |
Discover the ARP stretch gauge
This 1.6 range brings together two race forged-rod manufacturers. ZRP precision-machines and weight-matches its rods, in the I profile. Wössner, a respected German manufacturer, offers its A-Beam profile (an optimised I-beam) in 4340 steel. Each reference ships as a complete set of 4, with its dedicated ARP bolts.
 | Wössner is a German manufacturer whose reputation rests on engine parts machined to very close tolerances. For this 1.6 it supplies a forged-steel rod in an I-beam profile, weighed then matched set by set, and fitted with its own ARP 2000 hardware. The result is a light, tightly calibrated assembly backed by fully traceable European manufacturing. |
 | ZRP is the Athens workshop of Alex Drakos, where every competition rod is drawn and built in house. The body is forged from heat-treated 4340 steel and then precision-machined; each set is weighed and matched to within ±1 g so the bottom end stays balanced at high rpm. On this 1.6 the rod comes in an I-beam profile, with ARP 2000 or ARP L19 bolts depending on the part number. Design and inspection remain Greek, with proven experience in rallying, on track and in drift. |
 | 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 Fords powered by the 1.6 L 16-valve four-cylinder (Sigma / EcoBoost), first and foremost the Fiesta ST:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Ford | Fiesta ST (Mk7) | JTJA / JQDA / JQDB | 134 kW (182 ch) | 2013–2019 |
| Ford | Focus III / C-Max II | YUDA | 110 kW (150 ch) | 2010–2014 |
| Ford | Fiesta 1.6 Ti-VCT (Mk6 / Mk7) | HXJA / HXJB | 89 kW (120 ch) | 2008–2017 |
A set of forged rods costs vastly less than a blown engine: on a 1.6 pushed on boost and rpm, a factory rod that lets go takes out the block and the crankshaft. By fitting weight-matched forged rods from the outset, you make your build reliable for the long term and spare yourself a full rebuild, for a negligible extra cost next to the price of a new engine.
