Forged Pistons for BMW N20B20, 84.5mm, 10:1 or S55B30 10.2:1 or N55B30 11:1 (CP Pistons SC7701)
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|
Make |
BMW |
|
Model |
N20B20 |
|
Part Number |
SC7701 |
|
Cylinders |
4 |
|
Bore (in) |
3.327 |
|
Bore (mm) |
84.5 |
|
Size |
+0.5mm |
|
Stroke |
89.6 |
|
Conrod |
144.34 |
|
Comp Height (in) |
1.276 |
|
Comp Height (mm) |
32.4 |
|
Dom/Dish CC |
-10 |
|
Compression Ratio |
10 |
|
Weight (Grams) |
351 |
|
Pin (mm) |
22 |
|
Rings |
CPT-3307PVD |
|
Ring Thickness |
1.2 x 1.2 x 2.0mm |
|
Pin included (Standard) |
866-2250-18CP1C |
|
Upgraded Pin |
866-2250-20CP3C |
|
Ultra Duty Pin |
866-2250-25CP3C |
|
Locks |
866x063 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 BMW N20B20, 84.5mm, 10:1 or S55B30 10.2:1 or N55B30 11:1 (CP Pistons SC7701) |
|---|---|
| Brands | CP Carrillo |
| Engine | N20, N55B30 - S55B30 |
| Make | BMW |
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 compression ratio can I achieve with the SC7701 pistons in my BMW N20B20?
The SC7701 pistons provide a compression ratio of 10:1 for the N20B20 engine. If you're using them in an S55B30, the compression ratio is 10.2:1, and for the N55B30, it is 11:1. Always ensure that your engine is properly tuned to match the desired compression for optimal performance.
What is the recommended bore clearance for the SC7701 pistons?
The bore clearance for the SC7701 pistons should be set according to your specific engine build and the manufacturer's recommendations. Typically, a clearance of around 0.0015” to 0.0025” is common for performance applications, but always consult with your engine builder for precise specifications.
Can I use these pistons with upgraded valve sizes?
Yes, the SC7701 pistons are designed with deep valve reliefs to accommodate oversized valves and high lift camshafts. This allows for enhanced airflow and performance, making them suitable for modified engines.
What type of wrist pins are included with the SC7701 pistons?
The SC7701 pistons come with standard wrist pins (part number 866-2250-18CP1C) included at no additional cost. Upgraded and ultra-duty wrist pins are also available for those looking to enhance durability under high-performance conditions.
How are the SC7701 pistons balanced?
The SC7701 pistons are fully CNC machined and balanced to within +/- 1 gram. This precision ensures that they perform reliably at high RPMs, which is crucial for maintaining engine stability and performance.
