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ZRP
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ZRP
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Set of 3 forged 4340 steel connecting rods for Daihatsu 1.0L 12V Turbo CB-70 / CB-80.
The Daihatsu CB is an inline three-cylinder of 993 cc (76 mm bore, 73 mm stroke) with 12 valves and a turbocharger, produced from 1987 to 1993. Compact and light, it made the reputation of the Charade GTti, one of the smallest turbo hot hatches of its era, formidable in rallying and small-displacement motorsport.
On this small turbocharged three-cylinder, rising boost pressure and high revs put the rotating assembly under heavy stress. As soon as you exceed the stock output, the standard rods become the weak link: forged 4340 steel connecting rods secure the bottom end and allow aggressive tuning with full reliability.
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 19 mm | Small-end width | Big-end diameter OEM 46.1 mm | Big-end width | Center-to-center OEM 125 mm | Weight per rod |
|---|---|---|---|---|---|---|---|---|---|
| R-DAI-001H | ZRP | H | ARP 2000-5/16"-38mm | 19 mm | 46.1 mm | 24.8 mm | 125 mm | 387 g | |
| R-DAI-001H-L19 | ZRP | H | ARP L19-5/16"-38mm | 19 mm | 46.1 mm | 24.8 mm | 125 mm | 387 g |
| Rod | Bolts | Torque | Recommended stretch |
|---|---|---|---|
| ZRP (R-DAI-001H) | ARP 2000 | 40.7 N·m | 0.140 – 0.152 mm |
| ZRP (R-DAI-001H-L19) | ARP L19 | 54.2 N·m | 0.127 – 0.140 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. |
 | H-Beam profile. The H-beam rod, with two flat faces joined by a central web, offers maximum bending rigidity and excellent resistance to high loads. It is the preferred profile for heavily stressed, highly boosted engines such as the CB turbo. |
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. |
 | L19 (tensile strength ~260,000 psi, i.e. ~1,793 MPa) is designed for engines pushed to the extreme, up to 200 hp per cylinder with 5/16" bolts or 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. |
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. |
 | ZRP, a Greek manufacturer of high-performance forged connecting rods well known in motorsport. For this engine the range focuses on the H-Beam profile, available with ARP 2000 or ARP L19 bolts depending on the build. |
 | 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 vehicles fitted with the Daihatsu CB-70 / CB-80 engine (1.0L 12V Turbo):
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Daihatsu | Charade III (G100) 1.0 GTti | CB-80 | 101 hp | 1987–1992 |
| Daihatsu | Skywing III 1.0 | CB-80 | 101 hp | 1987–1990 |
OEM reference: 13201-87705-000 (CB-80, set of 3 rods; CB-70 not disclosed)
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.
