Forged Pistons for BMW N20B20, 84mm, 9.4:1 or S55B30 9.7:1 or N55B30 10.2:1 (CP Pistons SC7702)
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|
Make |
BMW |
|
Model |
N20B20 9.4:1/N55B30 10.2:1/S55B30 9.7:1 |
|
Part Number |
SC7702 |
|
Cylinders |
4 or 6 |
|
Bore (in) |
3.307 |
|
Bore (mm) |
84 |
|
Size |
STD |
|
Stroke |
89.6 |
|
Conrod |
144.3 / 143.3 |
|
Comp Height (in) |
1.276 |
|
Comp Height (mm) |
32.4 |
|
Dom/Dish CC |
-13.93 |
|
Compression Ratio |
TBD |
|
Weight (Grams) |
342 |
|
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, 84mm, 9.4:1 or S55B30 9.7:1 or N55B30 10.2:1 (CP Pistons SC7702) |
|---|---|
| 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 ratios are available with the SC7702 pistons?
The SC7702 pistons offer different compression ratios depending on the engine application: 9.4:1 for the N20B20, 9.7:1 for the S55B30, and 10.2:1 for the N55B30. It's crucial to ensure that the chosen compression ratio aligns with your engine's tuning and fuel quality.
What are the recommended machining requirements for the SC7702 pistons?
When installing SC7702 pistons, ensure the cylinder bore is properly honed to the correct clearance specified by the engine builder. Additionally, check that the ring gaps are set according to your specific application and operating conditions.
Can the SC7702 pistons accommodate high lift camshafts?
Yes, the SC7702 pistons feature deep valve reliefs designed to accommodate high lift camshafts, making them suitable for performance applications where increased airflow is necessary.
What is the weight of the SC7702 pistons, and how does it affect performance?
The SC7702 pistons weigh 342 grams each. This weight is optimised for performance, helping to reduce reciprocating mass, which can improve engine response and overall performance. However, ensure that the entire rotating assembly is balanced for best results.
What type of wrist pins are included with the SC7702 pistons?
The SC7702 pistons come with standard wrist pins (part number 866-2250-18CP1C) included at no additional cost. Upgraded and ultra-duty pins are also available for those seeking additional strength for high-performance applications.
