SKU: SC7221-4
CP Piston & Ring Set Mitsubishi 4B11 Evo X 2008-2015 Bore 86.5mm +0.5mm CR 9.2:1
This CP forged piston and ring set upgrades Mitsubishi 4B11 engines in 2008-2015 Lancer Evolution X models. Bore size of 86.5mm (+0.5mm oversize) supports larger displacement for more power while maintaining durability under boost. Includes matched rings for quick break-in and long-term sealing in street or track use.
Key Features
- Forged 2618 Alloy: High-strength material handles extreme cylinder pressures and temperatures in turbocharged applications
- Accumulator Groove: Controls combustion chamber pressure to resist detonation and extend engine life
- Skirt and Dome Coatings: Reduces friction wear and promotes heat dissipation for consistent performance
- Optimized Ring Grooves: Designed for low-tension rings to improve sealing blowby and oil control
- Balanced Set with Rings: Precision-machined 4-piston set with premium rings arrives ready for professional installation each piston weighs 382 grams
Product Notes
- Requires block boring and decking to 86.5mm bore by certified machine shop
- Rings arrive pre-gapped verify and adjust final gaps during assembly
- Ships in protective foam packaging to prevent damage
Installation Notes
- Professional installation recommended.
- Resize connecting rods and check rod bearings before assembly
- Hone cylinders to match CP-spec finish for optimal ring seal
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2015 | Mitsubishi | Lancer | Evolution GSR |
| 2009-2015 | Mitsubishi | Lancer | Evolution MR |
Why Choose CP Pistons?
- Proven in professional racing with multiple championships
- Every piston CNC-machined in the USA for exact tolerances
- Backed by extensive dyno testing for 4B11 applications
Frequently Asked Questions
- Q: Will this fit all Evo X 4B11 engines?
A: Yes fits 2008-2015 Lancer Evolution X GSR and MR models with stock stroke 4B11T confirm bore size before purchase - Q: What material are the pistons made from?
A: Forged from 2618 T6 aluminum alloy for strength and light weight each piston weighs 382 grams - Q: What warranty is provided?
A: Limited lifetime warranty against manufacturing defects when installed by qualified technician
Shipping & Handling
- Method: UPS Ground or FedEx
- Availability: In stock – ships same or next business day
- Packaging: Secure box measures 12 x 8 x 6 inches
- Weight: 5 lbs
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