K1 4.125" crankshaft 4340 forged

K1 Technologies Crankshafts

Thompson Motorsports carries a range of crankshafts including the ever popular, and affordable,  K1 Technologies Forged Crankshafts.

K1 Technologies crankshafts are manufactured with premium 4340 steel that is core hardened using a Nitride process, in place of induction heat-treatment, to help increase strength and reduce stress. This nitride process for hardening eliminates softening between the journals and post-running deformations. K1 Crankshafts have a straight hole oiling system for improved lubrication, are magnetic particle inspected, and are held to a maximum tolerance of .0002 in journal dimensions.

Average weight (4.000): 52lbs
Pin: 2.100 in.
Main: 2.559 in.
Reluctor: 24x or 58x