BC Brian Crower 2.5L Stroker Kit w/ ProH625+ Rods for 4B11T Evo X (BC0138)

This 2.5L BC stroker kit for the Mitsubishi Evo X 4B11T engine platform incorporates a 98mm stroke crank and ProH625+ rods. Depending on bore size that you decide, the BC kit will take you up to a 2.5L with a sleeved 90mm bore. This BC rotating assembly features custom CP pistons, steel alloy wrist pins, full ring pack and locks.

Vehicle Fitment:
2008-2015 Mitsubishi Lancer Evolution X
(4B11T CZ4A Evo X GSR and MR models)

Purchase Includes:
4340 billet crank - 98mm stroke
H-Beam ProH625+ rods (5.659 c-to-c)
Custom pistons (choice of bore/compression).
Wrist Pins, Full Ring Pack, and Locks

Notes:
ACL Race bearings available separately.

Feautres:
• BC 4340 steel billet crankshaft (98mm stroke).
• BC Pro Series connecting rods.
• CP or JE aluminum forged pistons (any bore size, any compression ratio).
• 5100 Series carbon steel alloy wrist pins. 9310 Series pin upgrade available.
• Ductile iron plasma top rings, tapered second ring, low tension oil rings.
• Fully system balanced and ready to install. (50% deposit required)

About BC Crankshafts:
BC crankshafts are crafted from premium aerospace-grade 4340 steel billet. They are CNC machined on advanced 5-axis Mazak Integrex 300-IV machines to precise tolerances of .0001". Each crankshaft includes large radius journals for added rigidity in high horsepower, high boost, and high RPM applications. Features such as gun-drilled, CNC-ground oil holes with a smooth surface for enhanced oiling, teardrop-shaped oil scoops, cross-drilling for priority main feeding to the rods, and a micro-polished mirror finish for optimal bearing lubricity are included. Additionally, all cranks undergo stress relief, shot peening, magna flux inspection, and nitriding for ultimate performance. The fully profiled counterweights are designed to reduce windage through the crankcase, decreasing oil resistance for improved RPM potential.

About BC Connecting Rods:
BC connecting rods are precision CNC machined from aerospace-grade 4340 steel billet, offered in both European-influenced H-beam and traditional I-beam designs for specific applications. Each rod features a deep, double-ribbed cap that maintains true big-end housing bore at high RPM, ensuring uniform bearing crush and superior oil supply for maximum load capacity. H-beam rods have deep radial groove pin bushings and oil holes at 5 and 7 o'clock, allowing the beam to act as a trough for critical wrist pin lubrication. I-beam rods include an oil hole at the 12 o'clock position to maintain pin end bore accuracy under high boost. Both designs are available with ARP2000 fasteners, rated at 210,000 psi, or ARP's Custom Age 625+ fasteners, rated at 280,000 psi.

Piston Options:
Choose from top piston brands like CP or JE, available in any bore size and compression ratio. These custom BC stroker pistons are made from 2618 T6 high-tensile-strength forged aluminum. The forgings are computer-designed for optimal strength and minimal weight, with each piston diameter CNC machined for accuracy and superior grain flow. Utilizing 3D modeling software and rigorous Finite Element Analysis ensures the pistons are the strongest and lightest possible for your application. Custom pistons feature tighter clearances, reduced noise, better ring seal, and enhanced durability. Standard features include pin fit, carbon steel wrist pins, and spiral locks or rail supports, depending on the application. Additional options include upgraded 9310 alloy wrist pins for reduced flex, lateral gas ports for improved ring seal, skirt and top coatings, and a lightweight design.

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