Forged Pistons for Nissan SR20 90 8.5:1 (CP Pistons SC73291)
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|
Make |
Nissan |
|
Model |
SR20DE/DET |
|
Part Number |
SC73291 |
|
Cylinders |
4 |
|
Bore (in) |
3.543. |
|
Bore (mm) |
90 |
|
Size |
+4.0mm |
|
Stroke |
86 |
|
Conrod |
136.25 |
|
Comp Height (in) |
1.26 |
|
Comp Height (mm) |
32 |
|
Dom/Dish CC |
-20.75 |
|
Compression Ratio |
8.5 |
|
Weight (Grams) |
360 |
|
Pin (mm) |
22 |
|
Rings |
CPN-3543 |
|
Ring Thickness |
1.0 x 1.2 x 2.8mm |
|
Pin included (Standard) |
866-2250-15CP1C |
|
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 Nissan SR20 90 8.5:1 (CP Pistons SC73291) |
|---|---|
| Brands | CP Carrillo |
| Engine | SR20 |
| Make | Nissan |
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 CP Pistons SC73291?
For the CP Pistons SC73291, a typical bore clearance is around 0.0020" to 0.0025". However, this can vary based on the specific application and the builder's preferences. Always consult with your engine builder for the best fitment.
What compression ratio will I achieve with the SC73291 pistons in my SR20 engine?
The SC73291 pistons provide a compression ratio of 8.5:1 when used in a standard SR20DE/DET configuration. Keep in mind that actual compression may vary based on head gasket thickness and any machining done to the block or cylinder head.
Can I use the SC73291 pistons with upgraded valve sizes?
Yes, the SC73291 pistons are designed with deep valve reliefs to accommodate oversized valves and high lift camshafts. Ensure that your valve sizes and camshaft specifications are compatible for optimal performance.
What type of wrist pin is included with the SC73291 pistons?
The SC73291 pistons come with a standard wrist pin (part number 866-2250-15CP1C) included at no additional cost. If you require a stronger option, upgraded and ultra-duty pins are available for purchase.
What machining processes should I consider when installing the SC73291 pistons?
When installing the SC73291 pistons, ensure that the cylinder bores are properly honed for clearance and that the ring gaps are set according to your specific application. Additionally, balancing the rotating assembly is crucial for optimal performance and reliability.
