Forged Pistons for Subaru FA20 / Toyota 4U-GSE, 86mm, 9:1 (CP Pistons SC7402)
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|
Make |
Subaru |
|
Model |
FA20 / 4U-GSE |
|
Part Number |
SC7402 |
|
Cylinders |
4 |
|
Bore (in) |
3.386 |
|
Bore (mm) |
86 |
|
Size |
STD |
|
Stroke |
86 |
|
Conrod |
129.3 |
|
Comp Height (in) |
1.292 |
|
Comp Height (mm) |
32.8 |
|
Dom/Dish CC |
-18.3 |
|
Compression Ratio |
9 |
|
Weight (Grams) |
320 |
|
Pin (mm) |
22 |
|
Rings |
CPN2-3386 |
|
Ring Thickness |
1.0 x 1.2 x 2.0mm |
|
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 Subaru FA20 / Toyota 4U-GSE, 86mm, 9:1 (CP Pistons SC7402) |
|---|---|
| Brands | CP Carrillo |
| Engine | FA20, 4U-GSE |
| Make | Subaru |
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 SC7402 pistons?
The recommended bore clearance for the SC7402 pistons is typically around 0.0015" to 0.0020". However, this can vary based on the specific application and the engine builder's preferences. Always consult your engine builder for the best fitment.
What compression ratio do the SC7402 pistons provide?
The SC7402 pistons provide a compression ratio of 9:1 when used in the Subaru FA20 or Toyota 4U-GSE engines. This ratio is suitable for a balance of performance and reliability, but ensure that your tuning and fuel quality match this setup.
Are the SC7402 pistons compatible with high lift camshafts?
Yes, the SC7402 pistons are designed with deep valve reliefs to accommodate high lift camshafts. This feature allows for greater airflow and performance potential in modified engines.
What is the weight of the SC7402 pistons?
The SC7402 pistons weigh 320 grams each. This weight is beneficial for reducing reciprocating mass, which can improve engine response and overall performance.
What type of wrist pins are included with the SC7402 pistons?
The SC7402 pistons come with standard wrist pins included at no additional cost. Upgraded and ultra-duty wrist pins are also available for those looking to increase durability in high-performance applications.
