Forged Pistons for Acura/Honda, B16A, 84.5mm, 11.9:1 or B18 Block w/B16A or B18C Head, 12.8:1 (CP Pistons SC7121X)
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|
Make |
Acura/Honda |
|
Model |
B16A |
|
Part Number |
SC7121X |
|
Cylinders |
4 |
|
Bore (in) |
3.327 |
|
Bore (mm) |
84.5 |
|
Size |
+3.5mm |
|
Stroke |
77.4 |
|
Conrod |
134.3 |
|
Comp Height (in) |
1.181 |
|
Comp Height (mm) |
30 |
|
Dom/Dish CC |
7.7 |
|
Compression Ratio |
11.9 |
|
Weight (Grams) |
273 |
|
Pin (mm) |
21 |
|
Rings |
CPN-3327 |
|
Ring Thickness |
1.0 x 1.2 x 2.8mm |
|
Pin included (Standard) |
827-2000-12CP1C |
|
Upgraded Pin |
827-2000-20CP3C |
|
Ultra Duty Pin |
NA |
|
Locks |
827x063 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 Acura/Honda, B16A, 84.5mm, 11.9:1 or B18 Block w/B16A or B18C Head, 12.8:1 (CP Pistons SC7121X) |
|---|---|
| Brands | CP Carrillo |
| Engine | B16 - Honda, B18 - Honda |
| Make | Honda |
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 SC7121X pistons in a B16A or B18 engine?
The SC7121X pistons provide a compression ratio of 11.9:1 when used in a B16A engine and 12.8:1 when fitted to a B18 block with a B16A or B18C head. Ensure that your engine is properly tuned to handle this compression for optimal performance.
What is the recommended bore clearance for the SC7121X pistons?
The bore clearance for the SC7121X pistons should be set according to the engine builder's specifications, typically around 0.0015" to 0.0025". This will depend on the specific application and intended use, so always consult with your engine builder for the best results.
Are the SC7121X pistons compatible with high lift camshafts?
Yes, the SC7121X pistons feature deep valve reliefs designed to accommodate high lift camshafts, making them suitable for performance applications where increased lift is required.
What type of wrist pins are included with the SC7121X pistons?
The SC7121X pistons come with standard wrist pins (part number 827-2000-12CP1C) included at no additional cost. For applications requiring more strength, an upgraded wrist pin (part number 827-2000-20CP3C) is also available.
Do I need to perform any machining on the SC7121X pistons before installation?
Before installation, it is advisable to check the piston-to-wall clearance and ensure that the ring gaps are set correctly. Depending on your engine's specifications, you may also need to perform additional machining to achieve optimal fitment.
