Forged Pistons for Mitsubishi, 4B11 / EVO X, 86.5mm, 9:1 (CP Pistons SC7221)
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|
Make |
Mitsubishi |
|
Model |
4B11T / EVO X |
|
Part Number |
SC7221 |
|
Cylinders |
4 |
|
Bore (in) |
3.406 |
|
Bore (mm) |
86.5 |
|
Size |
+0.5mm |
|
Stroke |
86 |
|
Conrod |
143.75 |
|
Comp Height (in) |
1.313 |
|
Comp Height (mm) |
33.4 |
|
Dom/Dish CC |
-5.3 |
|
Compression Ratio |
9 |
|
Weight (Grams) |
326 |
|
Pin (mm) |
23 |
|
Rings |
CPN-3406 |
|
Ring Thickness |
1.0 x 1.2 x 2.8mm |
|
Pin included (Standard) |
905-2250-15CP1C |
|
Upgraded Pin |
905-2250-19CP3C |
|
Ultra Duty Pin |
905-2250-26CP3C |
|
Locks |
905x073 SWL |
CP pistons are compatible with oversized valves and high lift camshafts. CP Pistons represent the highest quality and is engineered for maximum power. Standard features include: Deep valve reliefs accommodate high lift camshafts; Larger valve reliefs for +1mm valve sizes; Custom skirt cam and barrel design; Accumulator grooves; High strength aluminum forgings; High performance rings; Fully CNC machined and balanced to +/- 1 gram; Wrist pins included at no additional cost; Double pin oilers force fed from oil ring groove; Pin lock grooves for easy lock removal; Pin fitting included.
| Product Name | Forged Pistons for Mitsubishi, 4B11 / EVO X, 86.5mm, 9:1 (CP Pistons SC7221) |
|---|---|
| Brands | CP Carrillo |
| Engine | 4B11T / EVO X |
| Make | Mitsubishi |
Delivery & Freight
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What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What is the recommended bore clearance for the SC7221 pistons?
For the SC7221 pistons, a typical bore clearance of 0.0015" to 0.0025" is recommended. This allows for thermal expansion while ensuring proper fitment. Always confirm with your specific engine build requirements.
What compression ratio do the SC7221 pistons provide?
The SC7221 pistons have a compression ratio of 9:1. This is suitable for a balance of performance and reliability, particularly in turbocharged applications like the 4B11T.
Are the SC7221 pistons compatible with upgraded wrist pins?
Yes, the SC7221 pistons come with standard wrist pins included, but they are also compatible with upgraded pins such as the CP Ultra Duty Pin (905-2250-26CP3C) for enhanced strength in high-performance applications.
What type of rings are included with the SC7221 pistons?
The SC7221 pistons come with high-performance CPN-3406 rings, featuring a thickness of 1.0 x 1.2 x 2.8mm. These rings are designed for durability and optimal sealing under high-stress conditions.
Do the SC7221 pistons require any specific machining before installation?
Yes, the SC7221 pistons may require specific machining such as honing of the cylinder bores to achieve the correct clearance. Always consult with your engine builder for precise requirements based on your setup.
