Forged connecting rods Smart - 0.6L / 0.7L - M160 for forged pistons

Set of 3 forged ZRP connecting rods in 4340 steel for Smart 0.6L / 0.7L M160, 16 mm piston pin.

This complete set of three rods fits the three-cylinder Smart M160, in both 0.6 and 0.7 litre form. It allows a full bottom end rebuild in a single operation, with rods that are strictly identical to one another.

Specifications

+ Brand: ZRP
+ Beam profile: H-Beam
+ Material: 4340 forged steel
+ Bolts: ARP 2000 or L19
+ Center-to-center length: 114.00 mm
+ Piston pin diameter: 16.00 mm
+ Big end bore: 41.62 mm
+ Big end width: 17.00 mm
+ Weight: 264 g

Torque and bolt stretch

ARP 2000 bolts are tightened to 40.7 Nm, or by stretch control between 0.140 and 0.152 mm. With ARP L19 (tensile strength of approximately 260,000 psi, or ~1,793 MPa) bolts, torque is 54.2 Nm, for a stretch between 0.127 and 0.140 mm. These bolts are 5/16": ARP 2000 suits builds up to 150 hp per cylinder and 8,500 rpm, ARP L19 up to 200 hp per cylinder and 10,000 rpm. Measuring stretch with a dial indicator remains the most reliable method: it reflects the real tension in the bolt, whereas torque depends on thread friction.

Set supplied complete, bolts included depending on the range chosen. Fitting these forged rods is usually combined with replacing the original pistons with forged pistons.